Sunday, August 31, 2014

Digital Composite op Amplifier Wiring diagram Schematic

Build a Digital Composite op Amplifier Circuit Diagram. In the most general sense of the word, any additional schemary at either the input or the output of an amplifies. A composite configuration greatly reduces de errors without compromising the high-speed, wide band characteristics of HA-2539. The HA-2540 could also be used, but with slightly lower speeds and bandwidth response. 

 Digital Composite op Amplifier Circuit Diagram



The HA-2539 amplifies signals above 40 kHz which are fed forward via C2; R2 and R5 set the voltage gain at -10. The slew rate of this schema was measured at 350 V /p.s. Settling time to a 0.1 % level for a 10-V output step is under 150 ns and the gain bandwidth product is 300 MHz. The HA-5170 amplifies signals below 40kHz, as set by C1 and R1, and controls the de input characteristics such as offset voltage, drift, and bias currents of the composite amplifier

Therefore, it has an offset voltage ofl00 p.V, drift of 2 p.V/°C, and bias currents in the 20-pA range. The offset voltage can be externally nulled by connecting a 20-KO pot to pins 1 and 5; with the wiper tied to the negative supply. The de gains of the HA-5170 and HA-2539 are cascaded; this means that the de gain of the composite amplifier is well over 160 dB. The excellent ac and de performance of this composite amplifier is complemented by its low noise performance, 0.5-p. V rms from 0.1 Hz to 100Hz. It is very useful in high-speed data acquisition systems.
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Low cost intregated circuit audio power amplifier

KA2201
This amplifier circuit is very cheap, because not a lot of components that are required, and the voltage or amperage required is also not too large, so the transformer or power supply is also quite cheap. IC which can be used in power amplifier circuit is the KA2201, LM820M, TBA820M, U820. This amplifier output of 2 W and 4 ohm impedance, which can be applied to the speaker with 4W power, on such small speakers in front of a PC. For the required minimum input voltage of 3 volts and a maximum of 16 volts, for the recommended voltage of 12 volts.
Parts

Resistor
R1 = 100K
R2 = 120R
R3 = 100R
R4 = 10R

Capacitor
C1 = 0.1uF
C2 = 100uF
C3 = 47uF
C4 = 100uF
C5 = 470uF
C6 = 220pF
C7 = 100nF

IC
U1 = KA2201 , LM820M, TBA820M, U820
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Sound operated flip flop



This is a schema which the status of the output pins of a Flip Flop IC can be toggled by using sound. A condenser microphone is used for picking up the sound.







The first two opamps in the IC1 LM 324 is used to amplify the sound picked by the condenser microphone. The third opamp inside LM 324 is wired as a level detector. When ever the voltage produced due to sound have a level more than that of the reference voltage at pin 5 of the third opamp, its output (pin 7) goes high, triggering the flip flop IC1 CD 4027.As a result the state of the output pins of CD 4027 ( pin 1 & pin 2) toggles for each burst of sound



Notes.

* The schema can be powered from three 1.5 V cells in series.
* The ICs must be mounted on holders.
* The mic M1 is a condenser mic.
* The sensitivity of the schema can be adjusted by varying the preset R9.
* Assemble the schema on a good quality PCB.
* All capacitors must be rated 10V.

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Circuit Audio Amplifer with IC TBA810

Circuit Audio Amplifer with IC TBA810
See this Circuit Below:
Datasheet IC TBA 810
Vcc                = 4-20 V
Pout               = 7 W
RL                 = 4 Ohm
Ft                   = 30-18 Khz
Icco               = 13 mA
Package         = TABS3-12
Manufactered = ITT


other IC TBA 810 , In this circuit you can use the following IC 

A205K
A208E
A208K
A210E
A210K
DG810
K174YH7
K17YH9
MA873
TBA310AS
TBA790D
TBA790U
TBA790S
TBA810AS
TBA810AT
TBA810DS
TBA810DAS
TBA810S
TBA810T
TCA15OD
TCA15OU
TCA15OS
TCA15OT
TCA830
TCA830A
TCA830S
TCA940
TCA940E
UL1440
UL1481P
Persamaan IC TBA810




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Simple Regenerative Receiver Wiring diagram Schematic 80m or 40m

This is a simple design, can have excellent results, he is a recipient of regeneration, if you have never built any receiver, this is one you will build Easy. The schema described is simple and has many limitations in sensitivity and selectivity, but is able to receive signals from radio amateurs (40m or 80m) in SSB and CW, and as output using a small headset crystal. 

He will have a saturation if there are strong stations available on AM broadcast band of 41m at night.L1 is a small toroid T50-2 (red) with about 18 to 20 times (40m) or 35 to 40 times (80m) in the main winding connected to the FET with a single coupling schema facing the antenna connection. 

The center tap is about 20% of the primary winding. C1 is adjusted to set the radio band to the 40m and C2 then acts as a fine tuning within the band.The supply of 12 to 14V, R2 should be increased 5K6 or 6K8 output will be higher and similar sensitivity to-100dBm (about 2uV).

Regenerative Receiver Circuit Diagram

Regenerative

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Saturday, August 30, 2014

Build a Lcd Display Power Supply Wiring diagram Schematic

This is the simple Lcd Display Power Supply Circuit Diagram. Laptop computers often use large-screen LCDs, which require a variable and a negative supply to ensure maximum contrast. This schema operates from the system`s positive battery supply and generates a digitally variable negative voltage to drive the display. This figure`s switching regulator creates a negative voltage from the battery supply. The microprocessor data bus drives a 4-bit DAC, which in turn varies the actual regulator output from - 6.5 to -11.5 V. 

Lcd Display Power Supply Circuit Diagram

 

This arrangement allows a staircase of 16 possible voltages between these limits. The schema implements the DAC by using the rail-to-rail output-drive capability of a 74 HC-series CMOS gate. A resistor divider network formed by the 240-kfi resistor, connected to the -V filter capacitor and the resistors, is referenced to the 5-V supply control (the MAX635 regulator). 

When the voltage at the VFb pin is greater than ground, the switching regulator turns on. The inductor dumps this energy into the -V filter capacitor. When the voltage at VFb is less than ground, the regulator skips a cycle. The MAX635 regulates the voltage at the junction of the resistor divider to 0 V. Thus, any resistor that the DAC connects to ground (logic 0) will not contribute any current to the ladder. Only the resistors that are at 5 V (logic 1) will be part of the voltage-divider equation. 

The entire switching-regulator supply draws less than 150 . You can place the schema in an even lower power mode by interrupting the ground pin. The high-current path is from the battery input through the internal power PMOSFET to the external inductor. Disconnecting the ground connection simply disables the gate drive to the FET and turns off the internal oscillator.

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Music On Hold for Telephones

Here is a simple schema for music-on-hold with automatic shut off facility. During telephone conversation if you are reminded of some urgent work, momentarily push switch S1 until red LED1 glows, keep the telephone handset on the cradle, and attend to the work on hand. A soft music is generated and passed into the telephone lines while the other-end subscriber holds. When you return, you can simply pick up the handset again and continue with the conversation. The glowing of LED1, while the music is generated, indicates that the telephone is in hold position. As soon as the handset is picked up, LED1 is turned off and the music stops.

Circuit diagram :
Music-On-Hold
Music-On-Hold for Telephones Circuit Diagram

Normally, the voltage across telephone lines is about 50 volts. When we pick up the receiver (handset), it drops to about 9 volts. The minimum voltage required to activate this schema is about 15 volts. If the voltage is less than 15 volts, the schema automatically switches off. However, initially both transistors T1 and T2 are cut off. The transistor pair of T1 and T2 performs switching and latching action when switch S1 is momentarily pressed, provided the line voltage is more than 15 volts, i.e. when the handset is placed on the cradle. Once the transistor pair of TI and T2 starts conducting, melody generator IC1 gets the supply and is activated. The mu-sic is coupled to the telephone lines via capacitor C2, resistor R1, and the bridge rectifier.

With the handset off-hook after a ring, momentary depression of switch S1 causes forward biasing of transistor T2. Mean-while, if the handset is placed on the cradle, the current passing through R1 (connected across the emitter and base terminals of pnp transistor T1) develops enough voltage to forward bias transistor T1 and it starts conducting. As a consequence, output voltage at the collector of transistor T1 sustains for-ward biasing of transistor T2, even if switch S1 is released. This latching action keeps both transistors T1 and T2 in conduction as long as the output of the bridge rectifier is greater than 15 volts. If the handset is now lifted off-hook, the rectifier output drops to about 9 volts and hence latching action ceases and the schema automatically switches off.

EFY lab note. The value of resistor R2 determines the current through resistor R1 to develop adequate voltage (greater than 0.65 volts) for conduction of transistor T1. Hence it may be test selected between 33 kilo-ohms and 100 kilo-ohms to obtain instant latching.) The total cost of this schema is around Rs 50.

Author : SIBIN K. ZACHARIAH - Copyright : Electronicsforu
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Simple Electronic Music Maker Wiring diagram Schematic

Build a Simple Electronic Music Maker Circuit Diagram. This electronic music maker uses an astable oscillator schema that is controlled by a photocell. The light falling on the photo cell controls the tone. By mounting the schema in a box, you can control light-reading PCI with your hand.

Simple Electronic Music Maker Circuit Diagram


Simple

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Friday, August 29, 2014

Simple 0A° To 360A° phase shifter Wiring diagram Schematic

Each stage provides ° to 180° phase shift. By ganging the two stages, 0° to 360° phase shift is achieved. The 2N3070 JFETs do not load the phase shift networks.



 Simple 0A° To 360A° phase shifter Circuit Diagram

Simple


 Simple 0A° To 360A° phase shifter Circuit Diagram 
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Self Installation of Auto Sound System can Save Serious Cash

If you are seriously hoping to save a significant chunk of change when it comes to your auto sound system, you should consider saving on installation. Under ordinary circumstances I urge people to be very, if not overly cautious when it comes to installing your own auto sound systems. The thing is, that some people really are talented when it comes to activities such as this. Beyond talent, some people have frightening skills with electronics and if you are one of those, then by all means consider the money you could save yourself (or the extra money youd have to invest in your system?).


We all know that money doesnt grow on trees and when youve been saving up for quite a while to get the sound system you really want its a serious joy killer to have to wait another month or two in order to save up enough money to cover the cost of the installation of your sound system. If you or someone you know and trust (trust being the operative word in this instance) can do the work, it makes no sense from a fiscal point of view to pay someone else to do it.

That being said, if there are any doubts about your skill or experience you might want to at the very least get a second opinion or price installations in your area to see if it might actually be worth saving a little more. Time is another important issue when it comes to the installation of an auto sound system. It doesnt matter how capable you are of making the installation if you simply lack the time to do it. In cases such as this it would have been just as wise to go ahead and pay someone to make the installation. It makes much more sense to me than having the system sitting in a box for months on end while you wait for the time to get it taken care of.

I am one of those people who firmly believes that time is money. Time lost from work is expensive. This is especially true when the times of 10 or more people are lost. It adds up quickly no matter if you have a small or a large company. Time is also (unfortunately) the one commodity in life that you can never recover. No matter how hard you try you cannot recapture time that has been lost. If you have children you know exactly what Im talking about (particularly if your children are either teens or grown and gone). You cannot recover lost time so make sure you arent wasting your time by trying to install an auto sound system that is beyond your abilities.

Dont fret though. Most of us find that at some point in our lives we are limited by either time or money if not both. If everything was quick and easy we wouldnt really have anything worth working for would we? Consider all your limitations when planning and purchasing your auto sound system and make sure that the system you select falls squarely within your ability to install, your time limit for installation, or your price range for affording to pay for the installation. Whether you decide to do your own installation or have a professional installation of your auto sound system the prize is the superior sound quality you will be able to enjoy.

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Battery Switch With Low Dropout Regulator

In the form of the LT1579 Linear Technology (www.linear-tech.com) has produced a practical battery switch with an integrated low-dropout regulator. In contrast to previous devices no diodes are required. The schema is available in a 3.3 V version (LT1579CS8-3.3) and in a 5 V version (LT1579CS8-5), both in SO8 SMD packages. There is also an adjustable version and versions in an SO16 package which offer a greater range of control and drive signals. The main battery, whose terminal voltage must be at least 0.4 V higher than the desired output voltage, is connected to pin IN1. The backup battery is connected to pin IN2. The regulated output OUT can deliver a current of up to 300 mA. The LDO regulator part of the IC includes a pass transistor for the main input voltage IN1 and another for the backup battery on IN2.

 Battery Switch With Low-Dropout Regulator schema Diagram

Battery


The IC will switch over to the backup battery when it detects that the pass transistor for the main voltage input is in danger of no longer being able to maintain the required output voltage. The device then smoothly switches over to the backup battery. The open-drain status output BACKUP goes low to indicate when this has occurred. When neither battery is able to maintain the output voltage at the desired level the open-drain output DROPOUT goes low. The LT1579 can operate with input voltages of up to +20 V from the batteries. The regulator output OUT is short-schema proof. The shutdown input switches off the output; if this feature is not required, the input can simply be left open.

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Infrared Remote Controls Inside


The dominant remote-control technology in home-theater applications is infrared (IR). Infrared light is also known as plain-old "heat." The basic premise at work in an IR remote control is the use of light to carry signals between a remote control and the device its directing. Infrared light is in the invisible portion of the electromagnetic spectrum.
An IR remote control (the transmitter) sends out pulses of infrared light that represent specific binary codes. These binary codes correspond to commands, such as Power On/Off and Volume Up. The IR receiver in the TV, stereo or other device decodes the pulses of light into the binary data (ones and zeroes) that the devicesmicroprocessor can understand. The microprocessor then carries out the corresponding command.
To get a better idea of how the process works, lets take a look inside a typical remote control -- the universal remote that came with the authors digital cable box. The basic parts involved in sending an IR signal include:
  • Buttons
  • Integrated schema
  • Button contacts
  • Light-emitting diode (LED)
To find out more about the parts on a remote-control schema board, check out Inside a TV Remote Control.
On the component side, the infrared receiver sits on the front of the device where it can easily see the signal coming from the remote control.
Youve probably noticed that some remotes only work when youre pointing them directly at the receiver on the controlled device, while others work when youre pointing them in the general vicinity of the receiver. This has to do with the strength of the transmitting LED. A remote with more than one LED and/or a particularly powerful LED produces a stronger, broader signal.
Now lets find out how these parts work together to allow pulses of light to change the channel on a cable box.
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Refrigerator Door Alarm Wiring diagram Schematic

Do your kids leave the door to the refrigerator open? Or does your celery reach out to keep the door from closing properly when you turn your back? Heres a simple schema that beeps whenever the door is open for an extended period of time (which will also put a little pressure on the fridge loiterers in the house). 

Simple Refrigerator Door Alarm Circuit Diagram 

Refrigerator

The photocell has a very high resistance in the dark which drops very low when the door opens and the light turns on. The 22 uF capacitor begins to charge and when the voltage reaches the zener voltage, the beeper sounds. Closing the door allows the capacitor to discharge through the 10 meg.  resistor, resetting the beeper. The schema draws very little power when the door is shut and only draws significant current when the beeper is sounding. The transistor may be a single NPN darlington such as the MPS-A14 or two 2N4401s connected as shown. Other types will also work. The delay may be changed by changing the value of the capacitor. It may be a good idea to add a 10 uF capacitor across the battery.
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Thursday, August 28, 2014

6 to 12 Volt Power Supply Inverter

This inverter circuit can provide up to 800mA of 12V power from a 6V supply. For example, you could run 12V car accessories in a 6V (British?) car. The circuit is simple, about 75% efficient and quite useful. By changing just a few components, you can also modify it for different voltages.



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Simple Cold Cathode Fluorescent Lamp Supply Wiring diagram Schematic

Simple Cold-Cathode Fluorescent-Lamp Supply Circuit Diagram. For back-lit LCD displays, this supply will drive a lamp. LT1072 drives Ql and Q2, and a sine wave appears across CI. LI is a transformer that steps up this voltage to about 1400 V. Dl and D2 detect lamp current and form a feedback loop to the LT1072 to control lamp brightness. C1 = MUST BE A LOW LOSS CAPACITOR. METALIZED POLYCARB WIMA FPK 2 (GERMAN) RECOMMENDED. L1 = SUMIDA 6345-020 OR COILTRONIX CTX110092-1. PIN NUMBERS SHOWN FOR COILTRONIX UNIT. L2 = COILTRONIX CTX300-4 * = 1 % FILM RESISTOR. 

  Cold-Cathode Fluorescent-Lamp Supply Circuit Diagram


 cold-cathode fluorescent-lamp supply circuit diagram
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Simple Unity Gain Non inverting Amplifier Wiring diagram Schematic

In the world of electronic, gain is a measure of the ability of a schema (often an amplifier) to increase the power or amplitude of a signal from the input to the output, by adding energy to the signal converted from some power supply. It is usually defined as the mean ratio of the signal output of a system to the signal input of the same system. 

 Simple Unity Gain Non-inverting Amplifier Circuit Diagram

Simple

 It is often expressed using the logarithmic decibel (dB) units ("dB gain"). A gain greater than one (zero dB), that is, amplification, is the defining property of an active component or schema, while a passive schema will have a gain of less than one. The same voltage level and impedance is also known as unity gain. This is a simple Biasing methods for an N-channel MOSFET to form a unity-gain non-inverting amplifier
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Battery Charger LM317

Lead Acid Battery Charger schema is highly recommended to recharge battery. And recommended that maximum voltage 24V 7A battery, so you can recharge a battery simultaneously. Battery Charger has been little use of several components such as diodes, electrolytic capacitors, transistors, resistors, and also for strengthening of the voltage and current stresses. And also do not forget to lowering electric voltage 220V to 20V-35V 5-10 Ampere suitable for Lead Acid Battery Charger schema.


 List of components for the schema Lead Acid battery:

R1               = 1Ω 2w
R2               = 100Ω
R3               = 220Ω
R4               = 10KΩ Trim
D1 - D5       = IN4004
Q1               = BC547
IC 1             = LM317
C1 - C2       = 1000µF 50V
C3               = 470µF 50V

Transformer I mentioned above can use the 5A - 10A with a secondary voltage of about 20Volt-35Volt AC. My advice to IC please be cooler, because when the schema and well even IC LM317 works it causes IC hot. Also to assemble the components using PCB (Printed works Circuit Board) qualified with a good track, as well as the components that will be used not forget to check back whether good or not, so it will also produce good results.
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Wednesday, August 27, 2014

Tone Control Circuit

Based on the classic Baxendall tone control schema, this provides a maximum cut and boost of around 10dB at 10K and 50Hz.

Tone
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Fan control temperature using sensor LM35

Basic circuit of the LM35 are made to control the fan is either used on amplifier that requires automatic cooling. Its use on power amplifier circuit above and only requires DC fan. From basic sensors based on ic and amplifier op-amp is added again to the transistor Q1 to drive the fan.

Part List :
R1___220K
R2___100K
R3___3K3
R4___22K
R5___1M
R6___150R
R7___2K2
R8___33R 4W
C1___100pF
D1___1N4148
IC1__7915
IC2__TL072
IC3__LM35
F1___DC Fan 12V


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DPA 220 Wiring diagram Schematic

DPA

T1 to T6 create the input differential stage. The D7 and D8 zener diodes stabilize at 5V. These are just the simplest low-power zeners, only they have to be coupled in tolerance of 200 milivolts, which should not be a problem. T1 to T6 are common all-purpose low-power transistors with high Hfe. These six and maybe the next four have to be coupled in tolerance of 25%.

The T7 and T8 are fast, switching application types.

T9 and T10 have to be fast and must hold a high voltage, thus the best are the "video" types - BF469/470. T15 and T16 are the same types.

The C9, C10 and C15 should stand voltages higher than usual 50 V - I dont know why.

D3 to D6 can be any silicon type, not Scottky, the ones listed below are just all-purpose low-current ones for 150 V. These diodes should be rather fast - "switching types".

The T11 and T12 stabilize the BIAS current for the power stage. T11 also serves as a temperature sensor, and is mounted to the cooler of power transistors.

T13 and T14 secure the output current - in cooperation with R38 and R39.

The output transistors used here are Tesla types - Tesla is a former local devices manufacturer - the pair in each branch can be replaced with a single power darlington, like BD649/BD650. They should have Pc > 150W, Ic > 15A, Uceo > 100V.

In this case obviously the R38+R40 / R39+R41 must be connected parallel. These resistors should be able to absorb high power - at least 2 W, but Id use 5W ones.

The output filter improves stability of the amp when working with complex impedance of speakers - it is quite important. The resistors are high-power ones again, the coil is 13 turns of a 1.2 mm wire on a 8 mm thorn (diameter). R43 is placed coaxially in the coil.

The schematic also includes power supply capacitors and rectifier - the capacitors size is not crucial, generally the bigger the better. The rectifier originally consists of four silicon 10A diodes, but you can use whatever you have - rectifier bridge etc. The trafo should be a 2 * 30 V / 7 A type so that you have +/- 40 V on the power supply capacitors.

In the scheme theres also a thermistor that is supposed to be connected to some additional diagram that secure temperature and other things. The complementary input stage of DPA amps is an unmistakable heir of earlier designs published by Mr. Borbely in several issues of Volume 1984 of the Audio Amateur. Link
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Tuesday, August 26, 2014

Simple Low Cost 100W Inverter

Here is the schema diagram of a simple 100 watt inverter using IC CD4047 and MOSFET IRF540. The schema is simple low cost and can be even assembled on a veroboard. Circuit diagram : Simple Low Cost 100W Inverter Circuit Diagram CD 4047 is a low power CMOS astable/monostable multivibrator IC. Here it is wired as an astable multivibrator producing two pulse  trains of 0.01s which are 180 degree out of phase at the pins 10 and 11 of the IC. Pin 10 is connected to the gate of Q1 and pin 11 is connected to the gate of Q2. Resistors R3 and R4 prevents the loading of the IC by the respective MOSFETs. When pin 10 is high Q1 conducts and  current flows through the upper half of the transformer primary which accounts for the positive half of the output AC voltage. When pin 11 is high Q2 conducts and  current flows through the lower half of the transformer primary in opposite direction and it accounts for the negative half of the output AC voltage.

Notes.

  •     B1 can be  a 12V/ 6Ah lead acid battery.
  •     Q1 and Q2 must be fitted to a proper heat sink.
  •     T1 can be a 9-0-9 V primary, 230V secondary, 150VA transformer .
  •     Do not expect much from this schema. The is very simple one suitable for low grade applications.

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9 second Visual Timer Circuit


This is very useful schema for you,Because you all can use this timer for various purposes.And the impotent thing of this schema is giving a visual signal through LEDs.This is 9 second timer.This operates with 12v power.So you can use this one as a timer for your vehicle.



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Simple Touch Switch

This is a simple touch schema diagram.I think you can use this for many purposes.I have used this schema as a security schema device.Here I have used very common Transistors   2N 5458 N and 2N2222 to gain the signal .2N3906 Transistor work as a switch here.







Note 
# Build this schema on a PCB
# Use a copper plate to touch senseer 
# Dont supply more than12V



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Relay Toggle Circuit Using a 555 Timer

This 555 timer schema below toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and discharges when the output is low. When the button is pressed, the capacitor voltage is applied to pins 2 and 6 which causes the output to change to the opposite state. When the button is released, the capacitor will charge or discharge to the new level at the output (pin 3). The parts are not critical, the resistors can be somewhat higher or lower, but the 2 resistors at pins 2 and 6 should be equal values, and the resistor connected to the cap should be 10 times greater or more.

Circuit diagram :

Relay Toggle Circuit Diagram

Advantages of this schema are the large hystersis range at the input which avoids false triggering, and only a few parts are needed for construction. One disadvantage is the relay may be engaged when power is first applied. To solve this problem, you could tie the reset line (pin 4) to another resistor/capacitor combination with the capacitor at ground and the resistor at the +V point. This will cause pin 4 to be held near ground for a short period which will reset the output when power is applied.

The 100 ohm resistor and 100uF capacitor serve to filter noise on the supply line if the schema is used in a automotive application. They may not be necessary. The schema may work well without those parts.

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Monday, August 25, 2014

Simple Vlf Converter Wiring diagram Schematic

This is The Simple Vlf Converter Circuit Diagram. This converter uses a low-pass filter instead of the usual tuned schema so the only tuning required is with the receiver. The dual-gate MOSFET and FET used in the mixer and oscillator aren`t critical. 

Simple Vlf Converter Circuit Diagram


Simple
 
Any crystal having a frequency compatible with the receiver tuning range may be used. For example, with a 3500 kHz crystal, 3500 kHz on the receiver dial corresponds to zero kHz; 3600 to 100 kHz; 3700 to 200 kHz, etc (At 3500 khz on the receiver all one can hear is the converter oscillator, and VLF signals start to come in about 20 kHz higher).
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Power Supply Variable 1 3V 12 2V 1A Circuit

Power supply circuit to generate output below were variations between 1.3V DC to 12.2V DC with 1A current. In addition, the power supply circuit is also equipped with over-current protection or shield against belebih flow. Power supply circuit is very simple, but the quality is quite good, made her basiskan regulator IC LM723 is a pretty legendary.
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Multiplexer with TTL IC 74251

Actually you can not bother to design a multiplexer using logic gates because it has many special IC which functioned for a multiplexer.
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The Air iPad 2 and the new iPad Mini Reader

 The

According to the latest rumors, Apple is integrating fingerprint reader, Touch ID, in its different versions of iPad this year. This is not a big rumor as it is quite logical that the company is planning to expand the devices with this feature, allowing users more security on their devices.

Now, a photo revealed as the iPad could see Air 2 (second generation iPad Air) and the new iPad Mini with Retina Display, with the Touch sensor ID.

Additionally able to know a little Air iPad 2 and the new iPad Mini, the picture also show an iPhone over them two, possibly iPhone 6, but few extra details that can be perceived in this cell phone, as in Apples new tablet.

According to rumors, the iPad Air 2 would have some design changes, but it is not known whether these changes would also be coming to the third generation of the iPad Mini.

However, no more details are known about, so take into consideration the picture but did not have your own doubts, as it is actually impossible to know if these would be the new Apple devices.
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Sunday, August 24, 2014

6 Channels Audio Mixer

electronic
This is 6 Channel Audio Mixer schema. 3 channel for microphone input and the others 3 channel for audio input like CD player, computer, or television. There will be 6 potensiometer to control the volume of each channel.
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10 10W STEREO AMPLIFIER FOR CAR RADIO

Circuit diagram for 10 + 10W STEREO AMPLIFIER FOR CAR RADIO

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Power Mosfet Inverter Wiring diagram Schematic

This Power Mosfet Inverter Circuit Diagram can deliver .high-voltage ac or dc, with a rectifier and filter, up to several hundred volts. The secondary and primary of T1-a 12.6 to 440 V power transformer, respectively-are reversed; e.g., the primary becomes the secondary and the secondary becomes the primary. Transistors Q1 and Q2 can be any power FET. Be sure to heat sink Q1 and Q2. Capacitors C1 and C2 are used as spike suppressors. 

 Power Mosfet Inverter Circuit Diagram


Power
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Clap Switch Wiring diagram Schematic

Clap Switch Circuit Diagram. Here’s a clap switch free from false triggering. To turn on/off any appliance, you just have to clap twice. The schema changes its output state only when you clap twice within the set time period. Here, you’ve to clap within 3 seconds. 

The clap sound sensed by condenser microphone is amplified by transistor T1. The amplified signal provides negative pulse to pin 2 of IC1 and IC2, triggering both the ICs. IC1, commonly used as a timer, is wired here as a monostable multivibrator. Trigging of IC1 causes pin 3 to go high and it remains high for a certain time period depending on the selected values of R7 and C3. 

This ‘on’ time (T) of IC1 can be calculated using the following relationship: T=1.1R7.C3 seconds where R7 is in ohms and C3 in microfarads. On first clap, output pin 3 of IC1 goes high and remains in this standby position for the preset time.Also, LED1 glows for this period. The output of IC1 provides supply voltage to IC2 at its pins 8 and 4.
Clap Switch  Circuit diagram :
Clap
Clap Switch Circuit Diagram

Now IC2 is ready to receive the triggering signal. Resistor R10 and capacitor C7 connected to pin 4 of IC2 prevent false triggering when IC1 provides the supply voltage to IC2 at first clap. On second clap, a negative pulse triggers IC2 and its output pin 3 goes high for a time period depending on R9 and C5.

 This provides a positive pulse at clock pin 14 of decade counter IC 4017 (IC3). Decade counter IC3 is wired here as a bistable. Each pulse applied at clock pin 14 changes the output state at pin 2 (Q1) of IC3 because Q2 is connected to reset pin 15. The high output at pin 2 drives transistor T2 and also energizes relay RL1. LED2 indicates activation of relay RL1 and on/off status of the appliance. A free-wheeling diode (D1) prevents damage of T2 when relay de-energizes.
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Saturday, August 23, 2014

LED Flasher for RC Planes


This is so useful schema for Rc lovers.Because you can use this schema simply for your Rc plane or RC car.Here I have used common IC NE 555.So easily you can find it.






Note

* This schema operates with 6V power supply.
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Single Supply Instrumentation Amplifier

The OP284 is a low noise dual op amp with a bandwidth of 4MHz and rail-to-rail input/output operation. These properties make it ideal for low supply voltage applications such as in a two op amp instrumentation amplifier as shown in the diagram. The schema uses the classic two op amp instrumentation topology with four resistors to set the gain. The transfer equation of the schema is identical to that of a non-inverting amplifier. Resistors R2 and R3 should be closely matched to each other as well as to resistors (R1+P1) and R4 to ensure good common-mode rejection (CMR) performance. It is advisable to use resistor networks for R2 an and R3, because these exhibit the necessary relative tolerance matching for good performance.



Potentiometer P1 is used for optimum d.c. CMR adjustment, and capacitor C1 is used to optimize a.c. CMR. With schema values as shown, schema CMR is better than 80 dB over the frequency range of 20 Hz to 20 kHz. Circuit referred-to-input (RTI) noise in the 0.1 Hz to 10 Hz band is exemplary at 0.45 µVpp. Resistors R5 and R6 protect the inputs of the op amps against over-voltages. Capacitor C2 may be included to limit the bandwidth. Its value should be adjusted depending on the required closed-loop bandwidth of the schema. The R4-C2 time constant creates a pole at a frequency, f3dB, equal to f3dB=1/2πR4C2. With a value of C2 of 12 pF, the bandwidth is about 500 kHz. The amplifier draws a current of about 2mA. 
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Fog Lamp Sensor Wiring diagram Schematic

For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions.
Circuit diagram :
Fog
Fog Lamp Sensor Circuit Diagram
When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched off to avoid irritating reflections. For this purpose, a mechanical switch is now built into the 13-way female connector in order to switch off the fog lamp of the pulling vehicle and switch on the fog lamp of the trailer or caravan. For anyone who uses a 7-way connector, this switching can also be implemented electronically with the aid of the schema illustrated here.
Here a type P521 optocoupler detects whether the fog lamp of the caravan or trailer is connected. If the fog lamp is switched on in the car, a current flows through the caravan fog lamp via diodes D1 and D2. This causes the LED in the optocoupler to light up, with the result that the phototransistor conducts and energises the relay via transistor T1. The relay switches off the fog lamp of the car.
For anyone who’s not all thumbs, this small schema can easily be built on a small piece of perforated schema board and then fitted somewhere close to the rear lamp fitting of the pulling vehicle.
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Intercom Circuit for Factories



Here I have given a intercom schema This schema is most suitable for factories.Because These units have high quality.Only 2 wires are required to connect the units together.













Note

# Be careful when you work with 230v


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Simple 5 Band Equalizer

This circuit uses a single chip, IC BA3812L to make 5 band graphic equalizer in audio hi-fi system. BA3812L IC is a 5-point graphic equalizer that has all functions integrated on a single IC. This IC is composed of five tone control circuit and input and output buffer amplifier. BA3812L have low distortion, low noise, and wide dynamic range, and is ideal for a variety aperanti Hi-Fi stereo. He also has a wide operating voltage range (3.5V to 16V), meaning he could be adapted for use on most stereo equipment.
5

The five center frequencies are independently set using external capacitors, and therefore act as an output stage buffer amplifier and tone control section is a series of its own, it is possible to do fine control over the frequency bandwidth. By using two BA3812Ls, you can create a 10-point graphic equalizer. Great header and pieces can be set by external components.

The recommended power supply of 8V, but this circuit can work well for supply voltage 9V. Limit the maximum voltage is 16V.

The circuit is given in the diagram operates in around 5 frequency bands:
100Hz , 300Hz , 1kHz , 3kHz , 10kHz
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Friday, August 22, 2014

Schematic Audio Power Amplifier with IC AN7105

This Schematic Circuit Audio Amplifier use IC AN7105 , minimum voltage 1,5 volt and maximum voltage 9,5 volt. This is a low voltage Amplifier , with output speaker stereo 2 X 0,38 watt . Its so low power amplifier. Impedance speaker is 32 Ohm ,with Frequency 20 Hz -20 kHz.

See this Circuit and package IC AN7105 below :


Package IC is DIP-18

Click to view Enlarge
















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LX1720 Audio Amplifier 2x20W

LX1720 general description:

The LX1720 controller IC contains the necessary functions to implement a stereo Class-D audio amplifier. A Class-D amplifier is a "switching" amplifier that converts a low-level, analog, audio input signal into a highpower, pulse-width modulated (PWM) output. The switching frequency is much higher than the audio band which allows high frequency out-of-band components to be removed with a simple LC filter. The LX1720 generates a PWM output by controlling external MOSFETs connected in a full-bridge configuration. Because the MOSFETs are either full "on" or full "off", their power dissipation is minimal allowing maximum power to be delivered to the speaker.

LX1720 Circuit:


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Simple 12 16V Converter Wiring diagram Schematic

This is simple 12 -16V converter schema diagram . Many devices operate from a car`s 12-V electrical system. Some require 12 V; others require some lesser voltage. An automobile battery`s output can vary from 12 to 13.8 V under normal circumstances. The load requirements of the device might vary. 

This schema maintains a constant voltage regardless of how those factors change. Simple schema, A, uses a 7805 voltage regulator.In addition to a constant output, this JC provides overload and short-schema protection. That unit is a 5-V, 1-A regulator, but when placed in schema B, it can provide other voltages as well. When the arm of potentiometer R1 is moved toward ground, the output varies from 5 to about 10 V. 


 Simple 12 -16V Converter Circuit Diagram


Simple
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1957 58 Dodge 4 Way Power Seat Wiring Diagram

1957-58 Dodge 4-Way Power Seat Wiring Diagram

This is 1957-58 Dodge 4-Way Power Seat Wiring Diagram:4 way seat adjusting switch, 30 amp circuit breaker, horizontal adjusting unit, battery,
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Thursday, August 21, 2014

Workings of STR IC Regulator Power Supply

The meaning STR in this article for example is a Sanken regulator series and Fairchild series STR-F/G/W KA05Q Is an ic Quasy Resonant Flyback (QRF) Swiching Regulator comprising (a) control IC and (b) power MOSFETs that are packed into a single unit. The regulator is designed so that only requires a few external components.

How it works :
A. UVLO (under voltage lock out)
Regulators will start working when the voltage Vcc start-up on pin-4 reaches 16V. Once the power supply voltage Vcc further work will be reimbursed through a switching transformer supplied from a diode rectifier. At the time the circuit was working when the voltage Vcc is less than 15V, the regulator controls will still work. regulator will stop working (protectionism) if the supply voltage Vcc drops to less than 11V.
  
2. Feedback control (pin-1)
Workings
PWM regulators work using the system, wherein the output voltage B + to stable controlled by the feedback circuit of the output voltage B + >>> >>> photo-coupler pin-1. A capacitor mounted on the pin-1 is used to prevent noise disturbance if anyone does not interfere with the working system.

  
3. Soft start (pin-5)
When the power is turned on first, then the circuit has not been working behind the Uman because there is no output voltage B +. This causes a heavy current on the MOSFET start. To prevent this, the regulator is equipped with soft start circuit internally and an external filter kapasitr.
If the power supply is used to monitor for example, the frequency of the regulator needs to be synchronized. External synchronization signal can be input through pin-5s
  
4. Protectors
Regulators are equipped with all sorts protector.
  • Over-current protector (OCP) or Over Load protector (OLP). For example, if there is damage to flyback or def yoke, it will cause the load voltage B + over. If there is such a case the regulator will die protectionism so that IC is not damaged. For over current sensor is a resistor with a small value that is placed on pin-2 to the ground.
  • Short protector. If the output voltage B + short, the regulator turns off protectionism.
  • Over-voltage protectors (OVP). Regulators are not equipped with a surge protector so if the feedback path disconnected can cause the output voltage of the transformer switching regulator power up or damaged .. With OVP protectionist regulator will die if the voltage supply Vcc pin-4 rise above 22.5v.
  • Thermal protector. Regulators will stop working if the temperature reaches 140 degrees Celsius.
6. Auto start.
Regulators will start automatically if the auto turns itself (protectionism) after OVP or OCP


read also ->>>> Troubleshooting STR IC Regulator Power Supply
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Generate Electricity from Body Heat Wiring diagram Schematic

The operating principle of this design is unique and extremely simple, the most critical component is the one ba7891 tunnel diode, the schema that are seven or more soldiers in series and connected to a heat sink large. The sink will serve to accumulate thermal energy, which can be the sun, a fire, the body or any other form of heat energy which is converted into a charge current for NiCd battery.

A tunnel diode is very different from a normal rectifier diode and is characterized by a quick response time, another feature and negative resistance, basically, is explored in this schema with the purpose of generating electricity from the heat.

 Generate Electricity from Body Heat Circuit Diagram

Generate
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DC Voltage Doubler using the 74HC132 Wiring diagram Schematic

This schema is a cheap way is a simple DC voltage doubler, which requires a few components and will generate a voltage 10Vdc from a 5Vdc power supply that can be output from the PC USB. The oscillator should be constructed from a non-functional door IC 74HC132 then requires more than two components are R1 and C3. The most important parameters of the voltage doubler schema are given in the table schema.

Note 
That due to the tolerances of the data IC may have a few differences.


DC Voltage Doubler using the 74HC132 Circuit Diagram


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