DIY PSU build query...

[Kitwn]

I should explain...

Probably like most people who are new to CNC'ing, once the bug bites I just want to get on with something ASAP. Unfortunately, I've come to discover that every decision seems to rely on another until you've gone full circle and are back at the start ;-) Well that's how it feels anyway.

Every answer raises two new questions. You'll have to get used to it I'm afraid!

There are plenty of sources of transformers. Have a look at RS Components for example. Even if you don't buy from them, you'll get an idea of the range available. Note that the DC voltage (that's appalling English, but everyone knows what it means) you will get from a finished supply is higher than the RMS voltage rating of the AC transformer, if a DC supply is what your drivers require. I've linked to the site linked below before but it's a good intro to DC PSU design. A supply for a CNC machine can be allowed to have quite a high ripple voltage and thus less capacitance than would be needed for, say, a hi-fi audio amplifier.

http://www.skillbank.co.uk/psu/