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10A stabilized power supply – Circuit Schematic
10A stabilized power supply
This is a heavy diet, which can deliver 10A stabilized. The circuit is built around a normal 78xx controller, but for extra power equipped with T1. For the 78xx...
0-28V Variable power supply II – Circuit Schematic
0-28V Variable power supply II
Another method of using opamps to regulate a power supply is shown below. The power transformer requires an additional winding to supply the op-amps with a bipo...
Switching Power Supply 14V – Circuit Schematic
Switching Power Supply 14V
In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor. Energy is ...
3-24V / 3A power supply – Circuit Schematic
3-24V / 3A power supply
This regulated power supply can be adjusted from 3 to 25 volts and is current limited to 2 amps as shown, but may be increased to 3 amps or more by selecting a ...
Negative Voltage Generator Schematic – Circuit Schematic
Negative Voltage Generator Schematic
Most operational amplifier circuits require a dual-polarity power supply - one having +V and -V. However, there are times when a DP supply simply isn't convenie...
Dual Power Supply 15V – Circuit Schematic
Dual Power Supply 15V
The 7915 (at least the "made in Morocco" I used) needs a small load (some mA) to work correctly. If you get funny voltages (-18.4V or so), put a resistor from t...
Auto poweroff for power supplies circuit – Circuit Schematic
Auto poweroff for power supplies circuit
Probably the easiest way of doing automatic switch off is with relay logic. In the diagram, the box marked RL1 is the coil, the 2 in the coil box tells you ther...
PC mains switch – Circuit Schematic
PC mains switch
This project couldn't be any simpler if it tried. Using the PC's internal 12V supply to operate a relay, it is 100% reliable. If the PC is on, the peripherals a...
Phantom PS for Microphone – Circuit Schematic
Phantom PS for Microphone
The circuit is shown in Figure 1, and as described above, uses a voltage doubler rectifier. Diodes D1 and D2 are 1N4004 or similar. From there, a pair of resist...
12V 40A Switching Power Supply – Circuit Schematic
12V 40A Switching Power Supply
The present trend is to use ever higher frequencies. But by doing so it becomes more difficult to filter out the RF noise inevitably generated by the switching....
5volt power supply – Circuit Schematic
5volt power supply
This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output v...
High Voltage power Supply – Circuit Schematic
High Voltage power Supply
A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detect...
Negative Voltage from single positive power Supply – Circuit Schematic
Negative Voltage from single positive power Supply
Opamps are very useful. But one of their major drawbacks is the requirement of a dual supply. This seriously limits their applications in fields where a dual su...
Stand alone CDROM audio driver – Circuit Schematic
Stand alone CDROM audio driver
Most of the CDROMS available have an Audio-Out Output to either plug in the headphones or connect it to an amplifier. This circuit enables one to use the CDROM...
30KV Power supply / Generator – Circuit Schematic
30KV Power supply / Generator
Easy to build, this high voltage generator is capable of generating up to 50KV but the breakdown voltage of the coil limits the voltage to a value somewhat lowe...
Electronic fuse circuit – Circuit Schematic
Electronic fuse circuit
Full short-circuit and overcurrent protection is given by this circuit suitable for workbench applications in technical schools and laboratories where there is ...
5-12V 200mA Regulated Power supply – Circuit Schematic
5-12V 200mA Regulated Power supply
It will accept AC from 6v to 18v or DC from 9v to 18v and any current up to 1 amp. The diode bridge on the input converts AC to DC and it doesn't matter which...
5v Regulated Solar Power Supply Circuit – Circuit Schematic
5v Regulated Solar Power Supply Circuit
This project uses the 1.2v rechargeable battery and solar panel from a Solar Garden Light. These lights can be bought for less than $5.00 in most $2.00 shops or...
0-12V 2A power supply – Circuit Schematic
0-12V 2A power supply
This project has two options. It can be a mains operated project, using a 2155 or 2156 transformer or it can be connected to a plug pack. We recommend it be co...
0-15 Volt 0-1A Power supply – Circuit Schematic
0-15 Volt 0-1A Power supply
TR1 provides a constant current to a bank of three zener diodes, thus maintaining a constant voltage independant of supply voltage variations. The resistor Rx i...