DIY 12V PSU for Proxxon tools.

My power supply for 12V proxxon tools.

Proxxon 12V tools use a rectified unsmoothed power supply to allow thyristor based speed control. But a basic 2A psu costs over 20€, so making one more powerfull yourself is an option. The Schematic of my PSU is the following:

I invidually fused every output with a 10A automotive fuse, as well as fusing the whole device with 1,6A fast-acting fuse, sized according to transformer max current draw, so if the transformer goes, it should not draw power too long.

Atleast thats the theory.

The innards are quite messy, but safe (trust me :P), bridge rectifier is isolated with kapton tape, atleast for now.

The plug was created by 3D printing a shape with cavities for a butt connector. I found that these connectors, manufactured by VOGT AG were just the right size. In any case they need to be the type where the metal part is not split halfway, but instead is a one continuous tube.

I got the 260VA transformer from the Finnish Defence Forces surplus store, with 26V and 12V output coils for 12€ the case was 8,50€ from the same place (obviously :D), Diodes costed me 2,5€ and fuses & fuse holders about 5€. So pretty good price for a psu with this output.