Hi everyone, I've made a bit more progress with the build and have built the unregulated stepper PSU. I managed to get a cheap 2*45VAC toroidal transformer which is probably well over specification, but it was a good deal. It will easily power the 4 steppers and a 5th when I add a rotary axis at a later date. I decided to include a Sedlbauer inrush current limiter because of the toroid size, and spent a bit more money on 105 degree centigrade rated capacitors. I have used the aluminium base plate as a heatsink for the bridge regulator and used a heatsink thermal compound to get good heat transfer. I was pretty confident that I had wired the PSU correctly but decided to play it safe and power it up using a variac to gradually increase the mains voltage from zero up to 240VAC. It all went well and nothing went up in a cloud of smoke.




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