[SOLVED] What are the pins on my IR receiver?

Other Hardware General Electronics
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WIN_20240312_14_49_54_Pro

I have this IR reciever (image above) that has three pins that are all the same length, no flat backing, only a flat side of it. I need to know, what are those three pins??? Which are gnd, vcc, and out?

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There is no convention for pin order. Find the datasheet for your 1838 IR sensor.

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IRreceivers

  • Assume you removed this from an existing component.

  • Look at the PCB traces on the original board to identify Vcc and GND.

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I dont have a datasheet it was scavenged

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It doesn't say anyhoo my time to log off. Ill figure it out thru experimentation (i.e. put it in one way and see if it fries)

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No, it probably doesn't. You'll have to trace from some power pins somewhere to the pins of the IR device. OR, if there's an identifiable IC on the board, you might be able to find VCC and GND of the IC, and then trace to the IR component.

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gosh that would take ages this thing is as big as my foot and is packed full of transistors capacitors and stuff like i said i think ill just experiment

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Start with GND which is usually called "the ground plane" because it is everywhere in large chunks of copper, usually under screw heads, and every device uses it.

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If there's an electrolytic capacitor somewhere on the board clip one lead of an ohmmeter to its negative lead then test the sensor pads for one with a zero ohm reading. That'll be sensor GND. No guarantee but it should work - assuming no positive ground weirdness.

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your vocabulary is evidently more complicated than mine. I do not own an ohmmeter and like I said I'm just going to experiment until I blow something up. adios for now its my bedtime :slight_smile:

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Actually, the source board is probably irrelevant, as our OP probably doesn't know which pin was in which hole anyway.
Experiment away.

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truth. I need to be more careful in the future. I assumed that one pin was longer than the others

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Figured it out. Have the flat side on the left and from left to right: out ground vcc. Hope this helps anybody out there suffering from the same ailment

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