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A capacitor question, ceramic versus film.

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Chris Wilson:
In the attached circuit C1 and C2 are 470pF for the MF version. I built the LF version and used polypropylene caps, easily found in 1nF value. I am building the MF version now, and I  do not have poly caps in 470pF, is there any reason not to use ceramic through hole caps there, at 470pF? Thanks.

jmelson:
Just use NP0 caps, and it should be fine.  Most likely anything at all will also be fine, is is just 5 V signals, anyway.

Jon

David Hess:
In almost all cases, ceramic C0G/NP0 capacitors can be used in place of film capacitors.  In many cases including this one, ceramic X7R capacitors (10% tolerance) would also work.

pwlps:
Poly caps are much more stable (temperature, aging) than the ceramic ones so you would use them e.g. in an RC or LC oscillator, but I don't see any reason to not to replace them with ceramic caps here.

I have a question: in your circuit the high and low side mosfets are driven in quadrature (from the 7474), what is the purpose of that?

Chris Wilson:
Thanks for the replies, I guessed the ceramics would be OK as coupling caps in this application but thought it prudent to check and be sure, I  know now for next time, and I much appreciate all the help :)

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