http://www.dvdhometheateronline.com/transmitter-receiver/
how to test if an IR LED is a transmitter or a receiver?
i have 2 LED's, the ones with the see through colourless casing, both of which look the same. so i needed to know how to differentiate the transmitter from the receiver so that i can place it correctly in my circuit.
I used to have to replace IR Led transmitters and receivers when I used to repair vcr's. I never seen a receiver than looked like a transmitter led. I would bet you somehow ended up with 2 transmitters.
I remember most of the receivers then were in a colored case while the transmitter was in clear as you stated.
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