What is this black thing next to the capacitor??? is it an LDR?


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Sandisk1duo8 years ago
maybe a crystal?
amando96 (author)  Sandisk1duo8 years ago
hmm never thought of that... maybe it is... but then where is the IR receiver? :O
never mind my dumb idea, i clicked the first picture and it looked silver to me that should be a IR receiver does it have any markings on it? or on the circuit board
amando96 (author)  Sandisk1duo8 years ago
no markings at all, or i would have searched them on google... thats why it's being hard to indentify it...
probably IR
amando96 (author)  Sandisk1duo8 years ago
yea IR something, not transistor though coz they detect veriations of light or something like that... anyways made an IR proximity detector with it ha
amando96 (author)  Sandisk1duo8 years ago
yea... but like IR what? lol transistor, resistor... something else... :O
a resistor that changes it's resistance when Infra Red light is shined on it
dude, i don't like spam :( just tell those people on the forum about instructables.. much easier post a forum topic on your website
It is more than likely the IR receiver.
The device has two pins, one called the 'collector' and one called the 'emitter' I suspect. Connect a voltmeter across the two pins and point the IR transmitter (the remote) at the sensor. You should see the voltage flick between 'something' (depending on the supply voltage) and a few hundred mV as the transistor turns on and off.
The chances are that there is some modulation happening so you probably need a scope to see the changes - a DMM (and your eyes!) would be too slow to see the changes!

Hope this helps!

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amando96 (author)  ste54428 years ago
ya will do thanks!
and ermmmm whats a DMM? lol =/
UziMonkey8 years ago
Probably not. It's probably some IR receiver IC. It having only two pins would be a big clue here, as most things in this TO-style package have three pins.
Another thing to note is that the casing of the device is actually a filter - it looks totally opaque but its not to IR.

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amando96 (author)  ste54428 years ago
Just did that, the voltage(or something) defenantly changes when an IR light is shined on it... so i guess it is... lol
amando96 (author)  ste54428 years ago
ya i forgot about that, so that normal light cant interfeere with the IR signals...
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