20/22 Ampere or 30/32 Ampere 13.8 volts power supply RE-PSF14A20 or PSF14A30

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20_30ampere_13v_powersupply_on6mu.gif


Remember to isolate the 2N3055 transistors from the chassis/radiator! This is very important! Use a radiator (heat sink) of appropriate size and surface area; insulating and heat-conducting spacer or at least a thin mica; hot adhesive and thermal paste.

PSF14A20 Specs

  • Heavy duty power supply 13.8 volt, 20 or 30 amps continue​
  • low ripple​
  • short-circuit protection​
  • HF-immunity​
  • Voltage can be set between 12,3 and +/- 15 volts​
  • only 0.35v drop at full load​
  • parts widely available and calculated way over the maximum load​
Of interest

PSF14A20 Parts (30 amp version PSF14A30 in blue)

  • transformer capable of delivering 20 amps @ 15volt (30 amps)​
  • 4 x 2N3055 (6 x 2n3055) (you can also use the 2N3773 transistor)
    Use a large radiator (heat sink) of appropriate size and surface area; insulating and heat-conducting spacer or at least a thin mica; hot adhesive and thermal paste.
  • IC 1: 7812 (small heatsink)​
  • D1: MB2504 is used as it is a 25 ampere rectifier bridge and should also be very good cooled.
    Or you could use 3 times four BYW29 8 amp diodes (TO220 pinning, cooling).​
  • D2 & D3: 1N4001 or simular​
  • D4: 1N5401 or simular (1N5400...1N5408)​
  • Zd: 15volt, 5watt (1N5352B) or a 15v 6 watt variant in the BZW03-Series​
  • C1: 47nF​
  • C2: 22000uF (+ 10000uF) 35volts​
  • C3: 100uF/35volt​
  • C4: 100nF​
  • C5: 4.7uF/35volt​
  • C6: 4.7uF/35volt​
  • C7: 100nF​
  • C8: 220nF​
  • C9: 220uF/25volt​
  • C10: 47nF​
  • C11, C12: 100nF​
  • R1: 2k2 / 1W​
  • R2: 10 1/2W (2,2 1/2W)​
  • R3: 6,8 1/2W (2,2 1/2W)​
  • R4': 1 Ohm 1/2W​
  • R5': 0.1 Ohm/5W​
  • R6: 2k2​
  • R7: 10​
  • R8: 2k2​
  • R9: 22​
  • R10: 1k5​
  • R11: 10​
  • R12: 220​
  • P1: 1k​
  • P2: 2k2 trimmer (to calibrate the meter that will be used to measure the amps)​
  • F1: 2A (3.18A)​
  • F2: 22A (35A)​
P1 allows you to 'trim' the output voltage exactly to 13.8 volts.
Just to be sure to prevent HF entering through the mains use a ring core and turn the mains a few times around it (see insides pics).
Be sure to use thick braid wires!!! They need to handle 20 (30) amps continues!
 
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