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Note:
The collectors of the finals needs to be soldered with a wire all together if the transistors even if they are isolated from the heatsink or not. If you do not isolated the finals from the heatsink, then please make sure the heatsink does not make contact with the chassis (metal casing where you plan to build the PS into).
Remember to use thick wires suitable for transfering the current needed according to the power supply you tend to build.

Part list for 6/8 Amp regulatable power supply (PSR28A68):

2 x 15 volt (30volt total) 6+- amps

D1...D4 = four MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 x 4 1N5401 (1N5408) diodes.

F1 = 1 Amp

F2 = 10 amp

R1 2k2 2,5 Watt

R2 240 ohm

R3,R4 0.1 ohm 10 watt

R7 6k8

R8 10k

R9 47 0.5 watt

R10 8k2

C1,C7,C9 47nF

C11 22nF

C2 two times 4700uF/50v

C3,C5 10uF/50v

C4,C6 100nF

C8 330uF/50v

C10 1uF/16v

D5 1N4148, 1N4448, 1N4151

D6 1N4001

D10 1N5401

D11 LED

D7, D8, D9 1N4001

IC1 LM317

Two 2N3055 transistors

P1 5k

P2 47 Ohm or 220 Ohm 1 watt * (be sure you can reach 0 ohms as any resistance limits the current)

P3 10k trimmer
Calibration:
- Get your hands on a calibrated digital meter or a good analog meter and measure the voltage at the output of the power supply.
- Turn P1 to maximum (maximum voltage of our power supply).
- Adjust P3 till the meter needle shows maximum result (end scale)
- If you want to calibrate the scale, turn P1 to several voltages (like every volt) and confirm each time with your calibrated voltage meter. Make a mark on your power supply meter-scale to calibrate the meter.
- You should see equal spaced voltage marks on your home-made scale if your meter is a linear type.

Less maximum output voltage needed?
In operation, the LM317 develops a nominal 1.25V reference voltage, VREF, between the output and adjustment terminal.
The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows through the output set resistor R2, giving an
output voltage of

Since the 100 uA current from the adjustment terminal represents an error term, the LM317 was designed to minimize IADJ and make it very constant with line and load changes.
To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output will rise.

Less amps needed?
Well, without much modification you can:
- only one 2N3055, will give you 4...5 amps.
- the bridge rectifier (D1...D4) only needs 4 x 1N5401 (any +/- 3 amp diodes as only halve of the max. amp is needed, so we have some room when short-circuited)
- one 4700uF (C2) is sufficient
- F2 = 6 amp
- D5, D10 = 1N4001

The power supply insides


Heat sink
Remember to isolate the transistors from the chassis/radiator! 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.

Finished power supply:
Note: You can add a 3th 2N3055 and use for R9=27 Ohm, to make a 10/12 ampere power supply of the design stated above.


PIC Volt Ampere Meter Kit

mmmmmmmmmmmmmmmmmmmmmmmmmmmmm

thanks

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