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):
|R2, R3||47K 0805|
|R4, R6||270K 0805|
|R8, R9, R14||4K7 0805|
|R10, R11||220R 0805|
|R12, R13||1R 1W|
|C2, C4, C5, C6, C7||100nF 0805|
|D1, D2, D3, D4, D6, D9||1N4007 SMD DO214BA|
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.