OK, start with this circuit...
I used my DVM freq counter and verified it is easy to adjust and will hit 60 Hz. The pot adjustment is really slow (a good thing).
How can I use the lights 60Hz to calibrate this? My early idea (which I haven't tried yet) is to use a CDS cell (aka LDR) to switch a transistor and beat it against this oscillator. The LED will slowly blink, the closer to 60 Hz it gets the slower it will blink. This way, a total noob with no test equipment can calibrate this to 60 hz.
Does anyone know how fast a CDS cell responds to AC? I would also like any other ideas that might apply, keeping parts cheap and parts count low.
I used my DVM freq counter and verified it is easy to adjust and will hit 60 Hz. The pot adjustment is really slow (a good thing).
How can I use the lights 60Hz to calibrate this? My early idea (which I haven't tried yet) is to use a CDS cell (aka LDR) to switch a transistor and beat it against this oscillator. The LED will slowly blink, the closer to 60 Hz it gets the slower it will blink. This way, a total noob with no test equipment can calibrate this to 60 hz.
Does anyone know how fast a CDS cell responds to AC? I would also like any other ideas that might apply, keeping parts cheap and parts count low.
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