[genericuser]

Hello zoners,

I've been playing with the idea of connecting up my AVR 8535 to some steppers for awhile now (especially after seeing H500s "Avr Unipolar Chopper Drive"), and here's what I've come up with. Being a relative newbie at electronic circuitry I would appreciate some tips/pointers to anything I have missed. There's probably a lot, as I didn't really expect this circuit to work as it seemed just a little too simple, but I have it powering a 1.34 Amp 4V stepper with a 12V supply with great success. No overheating anywhere.

It get's it pulses from the 8535 AVR, which is just putting out half-step pulses with no connection to the PC, although this will be done shortly.

All this is currently sitting on my breadboard and I'd like to move it to a proto-board but would like some feedback beforehand.

FYI R6 trimpot is around 3k

Do you think that this design would work for larger stepper?

All comments appreciated

Cheers
generic