Per an earlier post, I’d run through ‘Gecko: Step Motor Basics’ and put the details into a spreadsheet, the results reflect the numbers quoted by Jazz. As the basics of building a dedicated PSU have been clearly stated, I will give it a go.

I will follow the PSU circuit provided by Irving, except for the safety circuit, which will be adjusted to include things I already have hanging around:

- NVR Switch, removed from a 240v hobby router table
- Zig CF-8 charging and distribution unit 12v http://www.zig-electronics.co.uk/products.htm#
- 240vac, 25 amp Consumer Unit
- STAC, AC voltage regulator, ST500W (Type D) http://stac-japan.jp/portable/

Zig unit will be used in the safety circuit, in place of the 24vdc transformer. The NVR switch is an option, but more probably a 12v momentary push button switch.

The Consumer Unit can be used as the primary switch (C or D rated MCB). The AC regulator can be wired into the safety circuit, using a third relay. It will take power from the 240v garage supply. I’m assuming I can break into the cable between the mains and the unit, so the unit and the spindle will be isolated when the e-stop button is pressed.

I'm still roughing things out and will need someone to review the completed PSU before I turn it on?