ajay_kumar_d
New Member
Here is a schematic of the circuit designed by myself for controlling 4 stepper motors through the parallel port . though this circuit is simple , it does not seem to work !!!
could anybody PLEASE:
1 . check the drawing for fundamental errrors.
2 . transistor 2n3055 does not bias
3. input is 12 volts 5 amp regulated by 8 - 7812 ics
4. voltage across sl100 is 2.5 volts
also could anyone please clarify whether there will be any voltage drop across the 7812. i seem to get only 8 volts after rectification. the rectification circuit is made of 4 - IN4001 diodes in a bridge.
thanks in advance,
D.ajay kumar
m.tech (mechatronics engg.)
Vellore Institute of Technology
india 18/03/04**broken link removed**