On 5/25/06, John Waters <john_fm_waters@hotmail.com> wrote:
> Hi All,
>
> I encountered some strange problems when was doing experiments on a simple
> oscillator circuit. I built a circuit that was made up by the 4 COMS NOR
> gates in a CD4001. I used the first 2 NOR gates to build a simple monostable
> that turned on or off a low frequency oscillator made up by the 3rd and 4th
> NOR gates. The circuit was built on a breadboard, running on 6V batteries. I
> found the following strange things happened and could not explain why:-
>
> 1. when I turned on my computer nearby, the frequency of the oscillator
> changed (slightly though). When I turned off the PC, the frequency went back
> to normal.
>
> 2. I triggered the monostable manually so that the output went to the ON
> state, but when I switched the light in the room off, at that particular
> moment, the monostable went back to normal state automatically.
>
> It was obvious that my simple circuit was interfered, but I was using
> battery as the power source, there was no way the mains spikes could go to
> my circuit! Could somebody give an explaination and suggest how to make my
> circuit not susceptible to the interference?
>
> Thanks in advanced!
>
> John
>

Can you draw your circuit for us?  Show all resistor values and bypass
capacitors.

Regards,
Mark
markrages@gmail
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