Quote:
Originally Posted by geekmaster
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Regarding driving an LED with PWM sound, I wonder if a dollar-store solar garden light photocell could drive a dollar store headset, when driven by an LED? Pretty darned quiet I think, at best. Yeah, amplified speakers (for those folks who still have them).
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Perhaps these have disappeared into history - -
But we had some very sensitive headphone(s) once that we used with our crystal radios.
That almost had to be at the micro-volt level or less.