"Ruben J=F6nsson" wrote:
> I'm sure that there are a lot of people here that can help you but we
> have to do a lot of guessing. You say you can't use a "black box" like
> a 555 but you can still use an opamp which can also be considered a
> "black box". Perhaps you can explain why you can't use certain parts

This smells like a homework assignment.


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