Mini Lab Power Supply
Some time ago I saw Turbokeu's his mini power supply, and I thought "I can build a smaller one". A month later I got an enclosure from a 12Vdc => 230Vac inverter (Thanks Jeroen!). This case was perfect for my mini psu. The volume off Turbokeu his supply is 1323cm³and mine will be 588cm³.
The circuit I used is based on an article Elektor published in march 98 (Called "Regelbare voeding" in Dutch). The displays are DPM125 witch I bought at an electronics flea market. The power supply delivers 3-24V at 1A. But this is only for short times because the case is used as heat sink.
Circuit display supply:
Pcb display supply:
Part list (only from the mainboard):
R1 1K 1206 R2, R3 47K 0805 R4, R6 270K 0805 R5 3K9 0805 R7 15K 0805 R8, R9, R14 4K7 0805 R10, R11 220R 0805 R12, R13 1R 1W R15 3K3 1W C1 4700µF C2, C4, C5, C6, C7 100nF 0805 C3 100µF D1, D2, D3, D4, D6, D9 1N4007 SMD DO214BA D5, D7 BAT85 D8 5V6 zener IC1, IC2 TLC271 IC3 78L09 POT1, POT2 1K Q1, Q2 IRF540 TR1 transformer
The top side of the mainboard:
Bottom side of the display supply:
Here you can see how much space is left:
2 pictures with my hand as size reference.