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Bought some old speakers from ebay - here's what I found inside
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floobydust:
OP would have to give us the capacitor values. One of the polystyrene caps is 680pF. It looks like tuning to a couple hundred kHz, below AM radio band.

I think it just sits there quiescent until the RX coil gets enough signal to clock the FF which generates output to the TX coil. The two 10MEG's add a minuscule amount to the off current drain.
james_s:
I bet a coil of wire connected to a function generator could be used to tickle it. Monitor the power consumption of the device and sweep the frequency until you see it do something.
Cyberdragon:

--- Quote from: james_s on May 18, 2021, 06:35:14 pm ---I bet a coil of wire connected to a function generator could be used to tickle it. Monitor the power consumption of the device and sweep the frequency until you see it do something.

--- End quote ---

Perfect use for a dip meter.
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