Here I've a small lab power supply that comes in super handy while tinkering with electronics. This one is silent (passive cooled), light (0.5 kg / 1.1 lb) and very compact (130 x 102 x 63 mm).
To make this, it takes a bit of electronic skills, which I'm sure you have if you're looking to make a power supply.
The unit is constant voltage and/ or constant current controlled.
A neat feature is that it also displays the power and can quickly be switched off without switching off the PSU entirely.
Input is mains voltage, output voltage goes up to 32 V, the current up to 5 A.
Set voltage is adjustable by increments of 0.01 V, the current by increments of 0.001 A.
The display shows:
- Set voltage, set current, input voltage.
- Actual voltage, actual current and actual output power.
List of parts I've used:
AC to DC 36 V, 5 A power supply:
This unit is capable of outputting 180 W of power.
I used a bit of hot-glue around the inside of the housing to secure it in place.
A panel mount switch (mains voltage):
You don't need two of them as is sold here, but I couldn't find only one.
Banana/ screw terminals:
Not exactly the ones I used, which I've had laying around for a long time. I like the ones with the hole on the thread, so a bare wire can be clamped, as can be seen in the first picture.
Screws to mount the top to the bottom and the PSU to the bottom plate:
3mm by 6 mm long self-tapping.
- Wires (I use 17 AWG equivalent) and AMP crimp connectors as can be seen in the fourth picture. and an old mains power cable (from an old video recorder or so).
Cost of these parts is about $45.
Be careful with connecting and testing this unit as it runs off mains voltage!
0.2 mm layer height, two layer walls, no supports.