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Sorry to revive an older thread.
There's something I don't understand about Ron's circuit suggestion with the common base for the negative edges.
I built the circuit as drawn, but when I connect the output to a 555 pin 2, the spike train vanishes. It should just be a high-impedance comparator input, no?
I tried to buffer the output with a common collector buffer, but got the same result. I will try again with a pair of common emitters (double inversion), but in the meantime maybe someone knows what's happening?
Sorry to revive an older thread.
There's something I don't understand about Ron's circuit suggestion with the common base for the negative edges.
I built the circuit as drawn, but when I connect the output to a 555 pin 2, the spike train vanishes. It should just be a high-impedance comparator input, no?
I tried to buffer the output with a common collector buffer, but got the same result. I will try again with a pair of common emitters (double inversion), but in the meantime maybe someone knows what's happening?
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