Circuit Wiring

Part list for 12 Amp BDX33-based power supply:

• 2 x 15 volt 6+ amps

• 2 times two MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 times 3 1N5401 (1N5408) diodes.

• F1 = 1 Amp

• F2 = 15 amp

• R1 2k2 1 Watt

• R2 10k

• R3 1k 0.5 watt

• R4,R5,R6,R7 0.1 ohm 10 watt

• R8 4.7

• R9 6k8

• C1 two times 4700uF/35v

• C2 330uF/35v

• C0,C3,C4,C6,C10 100nF

• C7 330uF/25v

• C8 47nF

• C9 47uF/25v

• D1 1N5401

• D2 LED

• D3, D4, D5 1N4001

• IC1 78L15

• relay 12 volt 2x5 amp switching

• 3 darlington transistors: T0,T1,T2 = BDX-33 NPN TO-220 transistor

• Zd 8 or 9 volt, 5 watt

• P1 2k trimmer

If using a bridge rectifier (like in schematic 2) you do not need 2 x 15 volts 6 amps, but 1 x 15 volt 10+ Amps

Part list for 20 Amp BDX33-based power supply:

• 2 x 15 volt 12+ amps

• 2 times 3 MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 times 5 1N5401 (1N5408) diodes.

• F1 = 2 Amp

• F2 = 25 amp

• R1 2k2 1 Watt

• R2 10k

• R3 1k 0.5 watt

• R4,R5,R6,R7 0.1 ohm 10 watt

• R8 4.7

• R9 6k8

• C1 22000uF/35v

• C2 330uF/35v

• C0,C3,C4,C6,C10 100nF

• C7 330uF/25v

• C8 47nF

• C9 47uF/25v

• D1 1N5401

• D2 LED

• D3, D4, D5 1N4001

• IC1 7815

• relay 12 volt 10 amp switching

• Four darlington transistors: T0,T1,T2,T3 = BDX-33 NPN TO-220 transistor

• Zd 8 or 9 volt, 5 watt

• P1 2k trimmer

If using a bridge rectifier (like in schematic 2) you do not need 2 x 15 volts 12 amps, but 1 x 15 volt 20 Amps