Hi again, after an evening of experimentation i think we have found something that may work: we used a test circuit with one BUZ11, a 2N2904 npn transistor the light bulb from before and a .3 ohm resistor in series with the bulb. the npn transistor drives the buz11 with about an 18V gate voltage and the buz11 drives the bulb. Dad drew the schematic and i put it at http://benlinuxisbest1.tripod.com/testcircuit.pdf . I drew a schematic of an h bridge that i think will work based on this experiment, it is at http://benlinuxisbest1.tripod.com/hbridge2.pdf (sorry it got a little messy). it seems like the problem was that the gate voltage was too low, as every one said. Do you think this new h bridge design will work? should we run the drill on a couple volts less than the gate voltage? (16V on the drill, 18V on the gate maybe?). I didn't draw in the other k2232 drive mosfet, i would rather leave it in but i can pull it out i think (tiny26 's can do 2 channels of PWM right? as i have it now i have portB1 doing what i want and portB0 doing the inverse). Thanks again for all your help, Ben Matthews
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Re: [AVR-Chat] Re: Motor Control Problems - more info
2005-02-20 by Ben Matthews
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