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Refugee · 13th Feb 2019, 5:14 pm

I would try connecting a high impedance input to an amplifier or scope to the photo transistor and see what you get through the speaker or on the screen when you point a remote control at it.

13th Feb 2019, 5:14 pm	#12
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: Replacement for a 1970s IR LED [ VP I would try connecting a high impedance input to an amplifier or scope to the photo transistor and see what you get through the speaker or on the screen when you point a remote control at it.