sam sokolik wrote: > The cnczone link tom posted is what I have been working on. The > current schem/pictures are here > http://www.electronicsam.com/images/KandT/servostart/schem/latestcurrentlimit/ > use at your own risk :) > > It might be overkill for your application but might give you some > ideas. The input is PWM/PWM (sending pwm in one input is cw - sending > pwm in the other input is ccw) (plus an enable). I have run this > directly from the printer port but am using the pluto for faster encoder > counting when using it to run closed loop (servo). It has been lightly > tested up to 22a 180v. (the limit right now is the boot strap diodes > are only rated for 200v). For my app that should be fine as 150-160v is > where my servos max out. > It would be quite easy to set up appropriate gates to deliver this dual PWM signal from my Universal PWM Controller. You can set it for whatever PWM frequency you like (I use 50 KHz with my own servo amps). My PWM controller puts out PWM and direction (kind of a sign-magnitude thing), but a single gate package like the 74HC00 could be wired up to convert from that to what your drive wants. I mention this in case others might want to try out your amp and have trouble with the Pluto.
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