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# 10 amps 13.8 volts power supply circuit show

2015-03-19 23:44
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This article describes the 10 amps 13.8 volts power supply circuit. The circuit is relatively simple, it is easy to grasp. Here you'll read the following diagram combine text bar. The circuit in Figure 1 will give us 10 amps (12 amps surge in the number) and performance equal to or exceeds any commercial unit. This circuit even has a current limiting function, which is a more reliable system than most commercial units. Like other commercial units, this circuit using LM723 IC, gave us excellent voltage regulation. 3 must pass transistor circuit using the heat sinked. Trimming resistor R9 to allow the voltage of 13.8 volts, complete and resistor network formed by controlling the current limiting resistor R4. R7 The LM723  limits the current and voltage drop across R5 approach. 7 volts. Reduce costs, most commercial units rely HFE to determine the current through the transistor limit. Failure of the system, through the transistor when the transistor HFE actually increased risk of heating and thermal runaway caused by a possible failure of the transistor. Because this circuit is a sample of the collector current through the transistor, thermal runaway is not a problem in this circuit to make it more reliable power supply. The only requirement is to adjust the setting R9 to the desired output voltage anywhere from 10 to 14 volts. If you want a thorough understanding of the principles of the circuit, I suggest you can go to find out the important components of the circuit: LM723.

I actually tested this and purposely destroyed several 2N3055’s by shorting the emitters to ground. In all cases the transistors opened up and no collector to emitter short occurred in any transistor. In any event, the optional circuit in Figure 2 will give you that extra peace of mind when a very expensive radio is used with the power supply. The circuit in Figure 2 senses when the voltage exceeds 15 volts and causes the zener diode to conduct. When the zener diode conducts, the gate of the SCR is turned on and causes the SCR to short which blows the 15 amp fuse and shuts off the output voltage. A 2N6399 (Tech America) was used for the SCR in the prototype but any suitable SCR can be used. While over voltage protection is a good idea, it should not be considered a substitute for large heat sinks. I personally feel the best protection from over voltage is the use of large heat sinks and a reliable current limiting circuit. Be sure to use large heat sinks along with heat sink grease for the 2N3055 transistors. I have used this power supply in my shack for several months on all kinds of transceivers from HF, VHF to UHF with excellent results and absolutely no hum. This power supply will be a welcome addition to your shack and will greatly enhance your knowledge of power supplies.

Parts List

R1 1.5K ? 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 ? Watt Resistor

R5 680 Ohm ? Watt Resistor

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

R8 2.7K ? Watt Resistor

R9 1K Trimmer Potentiometer (RS271-280)

R10 3.3K ? 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)