Thanks for your input phil. I have started converting the schematic into a pcb layout that can be done using tone transfer method. It is hard work I must say. Will keep all posted with my progress.
Yoram: my need isn't for microstepping but for high current. I have progressed from TIP 122 based 4 phase circuits to 5804 circuits driving high current steppers. Where I live the cost of L297 is cheaper than 2 8ohm 20W power resistors hence the employement of current chopping ability of L297. Ideally it would be nice if I could have a current chopping circuit to replace the power resistors in the tip or the 5804 circuits. but my electronics isn't that brilliant that I can muster up such a circuit.
ta
MKS |