555 dual channel pwm biasable invertable mosfet driver

283

02:57:24

Bottom left pot controls pulse width, the switches invert the signal and the pots below them bias the output. Its possible to add variable frequency capability but as you swing to lower freqs your pulse width control turns to crap. If anyone knows how to get around this with the 555 I would really love to hear about it.

published 11 years ago

peterc123

11 years ago

Good job

atlaswalkedaway

11 years ago

Thank you peterc123

faceblast

11 years ago

I haven't had much luck with PWM using 555s either. adjusting the frequency shifts the duty cycle and vice versa. ended up designing a circuit using comparators directly to isolate the pulse width from the frequency cycle to get around this

atlaswalkedaway

11 years ago

Is that the lm393 one faceblast? That looks like a much more elegant solution. Thanks for the tip.

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