Re: Turntable Stroboscope
If you have a 'scope, logic probe or logic analyser you can check the the outputs are oscillating (the first and last will also let you check the frequency).
Or a piezo buzzer (the passive type, not the type with internal electronics) connected between the '300Hz' output and ground will buzz at, not surprisingly, 300Hz. Now I can't judge pitch at all but even I can tell if it's oscillating.
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