This is the Ham radio power supply circuit with RFI elimination for Amateur radio.A typically Radio transmitters use High-frequency transistors as a current driver so can cause very severe electromagnetic. Therefore, The power supply must be able to make the current higher than 10A.
The schematic diagram
The output is 13.8 volts and has the short Circuit protection
We want a circuit that is affordable, and easy to build. The use of the package IC number LM350T 3-Amp Adjustable Regulators, with an excellent cooling system.
We need to set the voltage across ICs about 3A, to reduce stress on the IC.
Our approach to parallel the all Ics together, making it apply high current output. But because it may malfunction. We need to divide it into two section are:
The first IC (IC1) for a reference voltage to the IC, the three disciplines. (IC2, IC3, IC4) and adjust the output voltage by VR1, VR2, VR2.
the voltage of IC1 is controlled by the network resistors R1, R5, and R2, R3
– we should put Rs at each the output to adjust the stability of all ICs. We adapted Rs wire size 0.7 mm with a length of about 30 CM.
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Parts you will need
R1: 47 ohms
R2, R3: 1 ohms
R5: 560 ohms
VR1, VR2, VR3: 50 ohms, POT potentiometer
C1,C3,C5,C7: 4700uF 35V: Electrolytic Capacitors
C2,C4,C6,C8: 470uF 25V: Electrolytic Capacitors
C9-C12: 0.1uF 50V, Polyester Capacitors
BD1: 10A Bridge Diode
IC1-IC4: LM350T, 3A Adjustable Regulators
T1____Toroidal transformer 18V 6A
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