Re: Question re: about current control schematic

The parts for this are readily available. Jameco has the SG3524 for
under a buck. High current (16 amp) PNP Darlingtons are commonplace.
The fast MR850 diode is available from Alltronics. The most expensive
part for me was the choke from Digi-Key, but I've seen suitable
surplus ones for $1.50. And TIP120's are less than 50 cents each prime.

The list description states it is for home brew CNC, doesn't it?
Anyway, I enjoy tinkering and learning. I have been running steppers
on a homebuilt current limiting supply, and that cranks the torue and
speed up somewhat over current-limiting resistors, and I am interested
to see what this cheapo PWM PS will do.

Grant

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "mayfieldtm" <mayfiet@i...> wrote:
Even if one could get some of these
> parts surplus, and given the headaches of making it work,
> I would rather just buy a proven product like a
> "Gecko Drive" that has plenty of nice extras.
>