Sunday, August 31, 2014
Digital Composite op Amplifier Wiring diagram Schematic
Low cost intregated circuit audio power amplifier
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
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.
Circuit Audio Amplifer with IC TBA810
See this Circuit Below:
Simple Regenerative Receiver Wiring diagram Schematic 80m or 40m
Saturday, August 30, 2014
Build a Lcd Display Power Supply Wiring diagram Schematic
Music On Hold for Telephones
Simple Electronic Music Maker Wiring diagram Schematic
Simple Electronic Music Maker Circuit Diagram
Friday, August 29, 2014
Simple 0A° To 360A° phase shifter Wiring diagram Schematic
Self Installation of Auto Sound System can Save Serious Cash
Battery Switch With Low Dropout Regulator
Battery Switch With Low-Dropout Regulator schema Diagram
Infrared Remote Controls Inside
- Buttons
- Integrated schema
- Button contacts
- Light-emitting diode (LED)
Refrigerator Door Alarm Wiring diagram Schematic
Simple Refrigerator Door Alarm Circuit Diagram
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.
Thursday, August 28, 2014
6 to 12 Volt Power Supply Inverter
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Simple Cold Cathode Fluorescent Lamp Supply Wiring diagram Schematic
Simple Unity Gain Non inverting Amplifier Wiring diagram Schematic
Battery Charger LM317
R4 = 10KΩ Trim
Wednesday, August 27, 2014
Tone Control Circuit
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.
DPA 220 Wiring diagram Schematic
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
Tuesday, August 26, 2014
Simple Low Cost 100W Inverter
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.
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.
Simple Touch Switch
# Build this schema on a PCB
# Use a copper plate to touch senseer
# Dont supply more than12V
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.
Monday, August 25, 2014
Simple Vlf Converter Wiring diagram Schematic
Simple Vlf Converter Circuit Diagram
Power Supply Variable 1 3V 12 2V 1A Circuit
Multiplexer with TTL IC 74251
The Air iPad 2 and the new iPad Mini Reader
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.
Sunday, August 24, 2014
6 Channels Audio Mixer
10 10W STEREO AMPLIFIER FOR CAR RADIO
Circuit diagram for 10 + 10W STEREO AMPLIFIER FOR CAR RADIO |
Power Mosfet Inverter Wiring diagram Schematic
Clap Switch Wiring diagram Schematic
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.
Single Supply Instrumentation Amplifier
Fog Lamp Sensor Wiring diagram Schematic
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
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.
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
Friday, August 22, 2014
Schematic Audio Power Amplifier with IC AN7105
Package IC is DIP-18 |
Click to view Enlarge |
LX1720 Audio Amplifier 2x20W
LX1720 general description:
LX1720 Circuit:
Simple 12 16V Converter Wiring diagram Schematic
1957 58 Dodge 4 Way Power Seat Wiring Diagram
1957-58 Dodge 4-Way Power Seat Wiring Diagram |
Thursday, August 21, 2014
Workings of STR IC Regulator Power Supply
How it works :
- 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.
read also ->>>> Troubleshooting STR IC Regulator Power Supply
Generate Electricity from Body Heat Wiring diagram Schematic
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