[sdiy] KN-75 optocoupler

[anthony]

Really weird. So that answers a few questions my preliminary tests showed. 
that putting a 9V battery either way across those terminals will not make 
the LDR's resistance jump down.


>
> My guess is an incandescent bulb on one end and an LDR on the other.
> N'est-ce pas?
>


The optos I've pulled from answering machines have been neon/LDR combos.
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