Schematic & Wiring Diagram

10 Amp 13.8 Volt Power Supply Circuits Diagram

I actually activated this and advisedly destroyed several 2N3055’s by shorting the emitters to ground. In all cases the transistors opened up and no beneficiary to emitter abbreviate occurred in any transistor. In any event, the alternative ambit in Figure 2 will accord you that added accord of apperception back a actual big-ticket radio is acclimated with the ability supply. The ambit in Figure 2 senses back the voltage exceeds 15 volts and causes the zener diode to conduct. Back the zener diode conducts, the aboideau of the SCR is angry on and causes the SCR to abbreviate which assault the 15 amp agglutinate and shuts off the achievement voltage. A 2N6399 (Tech America) was acclimated for the SCR in the ancestor but any acceptable SCR can be used. While over voltage aegis is a acceptable idea, it should not be advised a acting for ample calefaction sinks. I alone feel the best aegis from over voltage is the use of ample calefaction sinks and a reliable accepted attached circuit. Be abiding to use ample calefaction sinks forth with calefaction bore grease for the 2N3055 transistors. I accept acclimated this ability accumulation in my berth for several months on all kinds of transceivers from HF, VHF to UHF with accomplished after-effects and actually no hum. This ability accumulation will be a acceptable accession to your berth and will abundantly enhance your ability of ability supplies.



Parts

R1 1.5K ¼ Watt Resistor (optional, tie pins 6 & 5 of IC1 together if not used.)

R2,R3 0.1 Ohm 10 Watt Resistor (Tech America 900-1002)

R4 270 Ohm ¼ Watt Resistor

R5 680 Ohm ¼ Watt Resistor

R6,R7 0.15 Ohm 10 Watt Resistor (Tech America 900-1006)

R8 2.7K ¼ Watt Resistor

R9 1K Trimmer Potentiometer (RS271-280)

R10 3.3K ¼ Watt Resistor

C1,C2,C3,C4 4700 Microfarad Electrolytic Capacitor 35 Volt (observe polarity)

C5 100 Picofarad Ceramic Disk Capacitor

C6 1000 Microfarad Electrolytic Capacitor 25 Volt (observe polarity)

IC1 LM723 (RS276-1740) Voltage Regulator IC. Socket is recommended.

Q1 TIP3055T (RS276-2020) NPN Transistor (TO-220 Heat Sink Required)

Q2,Q3 2N3055 (RS276-2041) NPN Transistor (Large TO-3 Heat Sink Required)

S1 Any SPST Toggle Switch

F1 3 Amp Fast Blow Fuse

D1-D4 Full Wave Bridge Rectifier (RS276-1185)

T1 18 Volt, 10 Amp Transformer Hammond #165S18 (Tech America 900-5825)