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# 6A / 0-28V Variable Power Supply circuit diagram

2015-03-21 04:57
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The following diagram is the schematic diagram of variable power supply which will deliver 0 to 28V output voltage at 6/8 A electric current.

Component Part List:

 R1 = 2K2 Ohm 2,5 WattR2 = 240 OhmR3,R4 = 0.1 Ohm 10 WattR7 = 6K8 OhmR8 = 10K OhmR9 = 47 Ohm 0.5 WattR10 = 8K2 OhmC1, C7, C9 = 47nFC2 = 4700uF/50v – 6800uF/50vC3, C5 = 10uF/50vC4, C6 = 100nFC8 = 330uF/50vC10 = 1uF/16vC11 = 22nF D1…D4 = four MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 x 4 1N5401 (1N5408) diodes.D5 = 1N4148, 1N4448, 1N4151D6 = 1N4001D10 = 1N5401D11 = LEDD7, D8, D9 = 1N4001TR = 2 x 15 volt (30volt total) 6 - AmpereIC1 = LM317T1, T2 = 2N3055P1 = 5kP2 = 47 Ohm or 220 Ohm 1 WattP3 = 10k trimmerF1 = 1 AmpF2 = 10 amp

Circuit Description:
This is an easy to make power supply that has reliable, clear and regulator 0 to 28 Volt 6/8 Amp output voltage. By making use of two 2N3055 transistor, you’ll get two times the amount of electric current.

Although the 7815 power regulator may kick in on short circuit, overload and thermal overheating, the fuses in the main section of the transformer and the fuse F2 at the output will safe your power supply. The rectified voltage of: 30 volt x SQR2 = 30 x 1.41 = 42.30 volt measured on C1. So all capacitors should be rated at 50 volts. Caution: 42 volt will be the voltage that could be on the output if 1 of the transistors ought to blow.

P1 lets you ‘regulate’ the output voltage to something in between 0 and 28 volts. The LM317 lowest voltage is 1.2 volt. To have a zero voltage on the output I’ve place 3 diodes D7,D8 and D9 around the output with the LM317 towards the base with the 2N3055 transistors. The LM317 optimum output voltage is 30 volts, but using the diodes D7,D8 & D9 the output voltage is approx 30v – (3x 0.6v) = 28.2volt.

Adjust your build-in voltmeter using P3 and, of course, a fine digital voltmeter is better solution.

P2 will let you to control the limit with the optimum available electric current in the output Vcc. When utilizing a 100 Ohm / 1 watt varistor the current is limited to approx. 3 Amps @ 47 Ohm and - 1 Amp @ 100 Ohms.