Re: Low frequency indicator?
@Herald1360 -- you beat me to it!
Use something like a 74LS121, configured as a retriggerable monostable producing constant-width and constant-amplitude output pulses, and just feed these into an analogue meter. The faster the pulses are coming, the greater the average energy er unit time will be.
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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