Re: Reverse engineering Lumenition optical switch
His!
From my industrial electronics experience, IR emitting LED devices almost always have a "water clear" package encapsulation, whereas IR photodiodes have a purplish (or dark blue/grey or even black) transparent package!
It's easy to test which is which if you have a current limited supply, or a 9V battery and a 1k resistor available – simply connect your water–clear device to a 9V battery via a 1k resistor in the forward direction and point your 'phone camera at it!
For circuit–drawing purposes, the purple–tinted device can simply be represented as a diode with two inward–arrows at 45° pointing towards it!
Photo–diodes are normally operated in the reverse–bias direction as a rule!
Chris Williams
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It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed!
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