Showing posts with label dc. Show all posts
Showing posts with label dc. Show all posts
Tuesday, November 18, 2014
Speaker Protector Circuit with DC Protection
Speaker protector function to protect the speakers from damage caused by spikes in the audio signal when first turned on and the DC signal from the audio signal clipping. circuit protectors speakers consist of 2 parts which can protect the speakers are part of the DC signal detection and the delay. Part detetor DC signal composed by 4 pieces arranged diode bridge and a transistor. Then agian delay on the speaker is using a tank circuit protector in the form of capacitors, where the circuit composed of R6, C3, TR2 and TR3. End part of the speaker is using a relay protector. circuit protectors speakers in detail can be seen in the following figure.
Safety Speaker circuit
| Component Speaker Protector Protection |
Monday, November 17, 2014
12V to 20V DC Converter Circuit
100 Watt 12V to +/- 20V DC Converter Circuit
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DC To DC Converter circuit used to be an convert voltage DC to DC with different concepts. DC to DC converter circuit +12 V to + /-20V is working to change the battery voltage from 12V DC to 20V DC voltage symmetrical. DC to DC converter circuit is often applied to the power amplifier udio on car audio systems. DC to DC converter circuit uses a TL494 IC as power plsa for the converter.
TL494 IC is a PWM controller with an adjustable frequency from 40-60Hz through a potentiometer. Then from the TL494 PWM signal is given to the driver MOSFET inverter TPS2811P to be given to the power inverter with 2 units of MOSFET transistors. Circuit details can be seen in the figure following the DC to DC converter.
DC To DC converter circuit +12 V To + / - 20V
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List Components DC To DC Converter +12 V To + / - 20V
- R1, R2 = 10
- R3, R4, R6, R7 = 1k
- R5 = 22k
- R8 = 4.7k
- R9 = 100k
- C1, C2 = 10000uF
- C3, C6 = 47 u
- C4 = 10U
- C5, C7, C14 = 100n
- C8, C9 = 4700u
- C12 = 1N
- C13 = 2.2u
- U1 = TL494
- U2 = TPS2811P
- Q1, Q2 = FDB045AN
- D1-D4 = 1N5822
- D5 = 1N4148
- FU1 = 10A
- L1 = 10U
- L2 = ferrite BEAD
- RV1 = 2.2k
- RV2 = 24k
- T1 = TRAN-3P3S
DC To DC converter circuit +12 V To + / - 20V is capable of supplying up to 100W and can power supplying currents up to 3A. In making DC To DC Converter +12 V To + / - 20V has to be careful and cautious because there are parts of DC To DC Converter +12 V To + / - 20V in the form of an AC circuit.
Friday, October 3, 2014
Variable DC Power Supply LM317 circuit and explanation
This DC power supply circuit is adjustable using IC Voltage RegulatorLM317. LM317 is a versatile and highly efficient 1.2-37V voltageregulator that can provide up to 1.5A of current with a large heat sink. Its ideal for just about any application. This was my first workbench power supply and I still use it.
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Since LM317 is protected against short-circuit, no fuse is necessary. Thanks to automatic thermal shutdown, it will turn off if heating excessively. All in all, a very powerful (and affordable!) package, indeed. Although voltage regulator LM317 is capable of delivering up to 37V, the DC power supply output circuit here is limited to 25V for the sake of safety and simplicity. Any higher output voltage would require additional components and a larger heat sink. Make sure that the input voltage is at least a couple of Volts higher than the desired output. Its ok to use a trimpot if youre building a fixed-voltage supply.
Problems: Follow all the safety precautions when working with mains voltage. Insulate all connections on the transformer. Possible uses: Variable workbench power supply, fixed-voltage supply. Just about any possible application when no more than 1.5A is necessaryhis BlogThis!Share to TwitterShare to FacebookShare to Google Buz
Read More..
Since LM317 is protected against short-circuit, no fuse is necessary. Thanks to automatic thermal shutdown, it will turn off if heating excessively. All in all, a very powerful (and affordable!) package, indeed. Although voltage regulator LM317 is capable of delivering up to 37V, the DC power supply output circuit here is limited to 25V for the sake of safety and simplicity. Any higher output voltage would require additional components and a larger heat sink. Make sure that the input voltage is at least a couple of Volts higher than the desired output. Its ok to use a trimpot if youre building a fixed-voltage supply.
Problems: Follow all the safety precautions when working with mains voltage. Insulate all connections on the transformer. Possible uses: Variable workbench power supply, fixed-voltage supply. Just about any possible application when no more than 1.5A is necessaryhis BlogThis!Share to TwitterShare to FacebookShare to Google Buz
Thursday, August 21, 2014
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
Saturday, August 16, 2014
DC to AC Inverter with 555 Wiring diagram Schematic
This schema is more of a DC to AC inverter, it uses a 555 IC as a low frequency oscillator, adjustable, adjustment can be done by the potentiometer R4 and frequency should be between 50-60 Hertz. The pulses from the IC 555 will go to Q1 and Q2 are amplified and sent to the transformer T1, which has its winding reversed. Capacitor C4 and coil L1 filter are the input to T1, it effectively ensures that a sine wave is formed.
DC to AC Inverter with 555 Circuit Diagram
DC to AC Inverter with 555 Circuit Diagram
List of components
R1 = 10K
R2 = 100K
R3 = 100 ohms
R4 = 50K potmeter
C1, C2 = 0.1μF
C3 = 0.01μF
C4 = 2700μF
Q1 = TIP41A, NTE196, ECG196
Q2 = TIP42A, NTE197, ECG197
L1 = 1μH
T1 = Transformer
Friday, August 15, 2014
Build a 12V To 24V DC DC Converter Wiring diagram Schematic
Build a 12V To 24V DC-DC Converter Circuit Diagram.This simple 12V To 24V DC-DC Converter Circuit Diagram can provide up to 24V from a 12V source. It can be used to run radios, small lights, relays, horns and other 24V accessories from a 12V vehicle with a maximum draw of about 800mA.
It can be used to charge one 12V battery from another, or step up the voltage just enough to provide necessary overhead for a 12V linear regulator. Using one op-amp as a square wave oscillator to ring an inductor and another op-amp in a feedback loop, it wont drift around under varying loads, providing a stable 24V source for many applications. With a wide adjustment in output this schema has many uses.
12V To 24V DC-DC Converter Circuit Diagram
Parts
| R1, R2, R3, R4, R8, R7 | 6 | 100K 1/4W Resistor | |
| R5 | 1 | 470 Ohm 1/2W Resistor | |
| R6 | 1 | 10K Linear Pot | |
| C1 | 1 | 0.01uF Mylar Capacitor | |
| C2 | 1 | 0.1uF Ceramic Disc Capacitor | |
| C3 | 1 | 470uF 63V Electrolytic Capacitor | |
| D1 | 1 | 1N4004 Rectifier Diode | |
| D2 | 1 | BY229-400 Fast Recovery Diode | See Notes |
| Q1 | 1 | BC337 NPN Power Transistor | |
| U1 | 1 | LM358 Dual Op Amp IC | |
| L1 | 1 | See Notes | |
| MISC | 1 | Board, Wire, Socket For U1, Case, Knob For R6, Heatsink for Q1 |
Notes
- R6 sets the output voltage. This can be calculated by Vout = 12 x (R8/(R8+R7)) x (R6B/R6A).
- L1 is made by winding 60 turns of 0.63MM magnet wire on a toroidial core measuring 15MM (OD) by 8MM (ID) by 6MM (H).
- D2 can be any fast recovery diode rated at greater then 100V at 5A. It is very important that the diode be fast recovery and not a standard rectifier.
- Q1 will need a heatsink.
Sourced By Circuitsstream
Sunday, August 10, 2014
Solid State Switch For Dc Operated Gadgets
This solid state DC switch can be assembled using just three transistors and some passive components. It can be used to switch on one gadget while switching off the second gadget with momentary operation of switch. To reverse the operation, you just have to momentarily depress another switch.
The schema operates over 6V-15V DC supply voltage. It uses positive feedback from transistor T2 to transistor T1 to keep this transistor pair in latched state (on/ off), while the state of the third transistor stage is the complement of transistor T2’s conduction state.
Initially when switch S3 is closed, both transistors T1 and T2 are off, as no forward bias is available to these, while the base of transistor T3 is effectively grounded via resistors R8 and R6 (shunted by the load of the first gadget). As a result, transistor T3 is forward biased and gadget 2 gets the supply. This is indicated by glowing of LED2.
Circuit diagram :
Solid-State Switch For Dc-Operated Gadgets Circuit Diagram
When switch S1 is momentarily depressed, T1 gets the base drive and it grounds the base of transistor T2 via resistor R4. Hence transistor T2 (pnp) also conducts. The positive voltage available at the collector of transistor T2 is fed back to the base of transistor T1 via resistor R3. Hence a latch is formed and transistor T2 (as also transistor T1) continues to conduct, which activates gadget 1 and LED1 glows.
Conduction of transistor T2 causes its collector to be pulled towards positive rail. Since the collector of T2 is connected to the base of pnp transistor T3, it causes transistor T3 to cut off, switching off the supply to gadget 2) as well as extinguishing LED2. This status is maintained until switch S2 is momentarily pressed. Depression of switch S2 effectively grounds the base of transistor T1, which cuts off and thus virtually opens the base-emitter schema of transistor T2 and thus cutting it off. This is the same condition as was obtained initially. This condition can be reversed by momentarily pressing switch S1 as explained earlier.
EFY lab note. During testing, it was noticed that for proper operation of the schema, gadget 1 must draw a current of more than 100 mA (i.e. the resistance of gadget 1 must be less than 220 ohms) to sustain the latched ‘on’ state. But this stipulation is not applicable for gadget 2. A maximum current of 275 mA could be drawn by any gadget.
Author : Praveen Shanker
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