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Re: [AVR-Chat] Re: Motor Control Problems - more info

2005-02-20 by Ben Matthews

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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