Hi.
I started my first op amp project and I am starting to get lost
I use propeller chip to control coil (actuator) with PWM. I have to be able to switch current (voltage) from possitive to negative and also back. I also have to amplify the signal. For that I use LM675 power op amp but I dont know whether I use it right way.
I use two propeller output pins connected to + and - of LM675 connected as difference amp for switching +/- voltage. I have only single supply so I connect supply pins to +12V and GND and half voltage parallel to pin + (found this in Texas inst. ebook).
Now the problem. I have the coil connected to power amp output and to GND. The coil has resistance somewhere around few miliOHMs (dont ask why). SO HOW COULD I CONTROL CURRENT GOING FROM OP AMP OUPUT TO COIL? HOW TO GET THE MAX CURRENT OUT OF IT?
Thanks for every reply
I started my first op amp project and I am starting to get lost
I use propeller chip to control coil (actuator) with PWM. I have to be able to switch current (voltage) from possitive to negative and also back. I also have to amplify the signal. For that I use LM675 power op amp but I dont know whether I use it right way.
I use two propeller output pins connected to + and - of LM675 connected as difference amp for switching +/- voltage. I have only single supply so I connect supply pins to +12V and GND and half voltage parallel to pin + (found this in Texas inst. ebook).
Now the problem. I have the coil connected to power amp output and to GND. The coil has resistance somewhere around few miliOHMs (dont ask why). SO HOW COULD I CONTROL CURRENT GOING FROM OP AMP OUPUT TO COIL? HOW TO GET THE MAX CURRENT OUT OF IT?
Thanks for every reply