Homebrew PCBs

"maybe this has been discussed but why not use mosfets instead of the NPNs?
If you can turn them fully on they will run a lot cooler with little voltage
drop."

'Cause the original schematic was configured with NPNs, 'cause MOSFETs
weren't included in alternatives and 'cause I lack experience in
substituting NPNs for MOSFETs. :)  If you have a suggestion, please post a
pic, I'm a visual person.


"Also, how are you limiting current?"

See, this is something else I need more information.  I have no idea what
you mean by limitting current.

I started with a schematic from Aaron's site which he had gotten from
someone else.  I'm just trying to make the circuit stable to use the 24V
steppers that I happen to have on hand.


Robert
:)





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