Transformer: Toroid from Parts Express with a 56V secondary (among several others). $29.95
Ajax CNC Rectifier Board: $29, has inrush protection.
Electrolytic Capacitor: eBay, about $3.
Specs: about 72V DC @ 5A out. 72V is about right for Geckos, just a little margin for error from their 80V rating.
This about twice the amperage needed for my 2 little steppers based on the design work I did, which suits me fine. The chassis and mountings consist of a piece of 18 gauge steel, a pipe clamp, and an expander rubber pipe plug from the hardware store. Miscellaneous parts and hardware probably cost me in the neighborhood of $15, so the total power supply cost came in at about $80.
That Ajax board made it an hour long project once I had all the parts. Really nice! :banana:
If you want more detail, try:
http://www.thewarfields.com/MT/MTLatheCNCDrivers.htm
Last weekend I finished up the rack mount PC for the project:
The 'puter is way more powerful than Mach 3 needs with an Athlon 64, but only cost me about $340 with all new components. Details available here:
http://www.thewarfields.com/MT/MTLatheCNCPC.htm
Next step is to put together a sub chassis with all the relays, fusing, and ancillary circuitry, then after that I need to wire up the GRex. All of that plus the power supply will go into a second rack mount chassis.
I might finish this thing yet!
Whoops! Getting over optimistic again. :drowning:
Best,
BW