[sdiy] adding PWM to a cmos clock?

Colin Hinz asfi at eol.ca
Sun May 17 20:29:55 CEST 2009


On Sun, 17 May 2009, Dan Snazelle wrote:

> right now i am using a high freq 40106 clock run from +5 and
> 0 volts. the cap value is around A 560PF.
>
> i would love to add pwm to this circuit.
>
> i tried simply running the out of this circuit into the NON
> INVERTING in of a 324 running off of +5 and ground, with a
> buffered pot going from grnd to 5volts and plugged into the
> non inverting input.
>
> the results were terrible.
>
> if anybody could point me in the right direction i would
> appreciate it as i KNOW PWM sounds good in the circuit i am
> working on but the 555 clock i got sucssful pwm with has far
> too small a range.

I'm guessing that you're using both edges of the clock, and hence
controlling the phase relationship between edges does something
interesting. What does your circuit look like, again?

- Colin




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