Re: looking for a 555 timer circuit

I've made the modifications except for the C2 in the revision C (have
to go get one). I still have not managed to find what I have wrong at
this point. Right now, U3Q1 seems to be staying high (2.2V) and I have
not observed U3Q2 or U3Q3 switching. U1-7 does exhibit a period of 4
seconds as you mentioned, and U1-6 does toggle.

.

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