[sdiy] CMOS clock problem

[Christian Bergmiller]

4001 lacks the "schmitt trigger" capability
40106 would perhaps be a better choice?

have you tried a small capacitor to the high rail?
(instead of the 2.2M resistor to ground)

 just some ideas..

christian


2008/4/21, mark verbos <mverbos at earthlink.net>:
> Hi,
>
> I have a high frequency clock made out of a couple 4001 gates in my
> quantizer module. It doesn't like to start clocking when I turn it on. Then
> I touch the pins with the scope probe and it starts going. I tried adding a
> 2.2M resistor to ground on the pin where the cap connects and I got it to
> start if I plug the connector in while the cabinet is powered up, but if I
> power cycle it while plugged in it's not oscillating. Is this something to
> do with the order that the power rails are coming up? It's only using +15
> and GND, so I don't see how it could.
>
> Any ideas? I'm lost.
>
>
> Mark
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