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

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amando96 (author)Sandisk1duo2009-01-31

hmm never thought of that... maybe it is... but then where is the IR receiver? :O

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Sandisk1duo (author)amando962009-01-31

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

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amando96 (author)Sandisk1duo2009-01-31

no markings at all, or i would have searched them on google... thats why it's being hard to indentify it...

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amando96 (author)Sandisk1duo2009-03-08

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

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amando96 (author)Sandisk1duo2009-01-31

yea... but like IR what? lol transistor, resistor... something else... :O

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Sandisk1duo (author)amando962009-01-31

a resistor that changes it's resistance when Infra Red light is shined on it

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Sandisk1duo (author)ste54422009-02-03

dude, i don't like spam :( just tell those people on the forum about instructables.. much easier post a forum topic on your website

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ste5442 (author)amando962009-02-03

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!

PCBPolice Electronics Forum - we need some users....please!

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amando96 (author)ste54422009-02-03

ya will do thanks!
and ermmmm whats a DMM? lol =/

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UziMonkey (author)2009-01-30

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.

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ste5442 (author)UziMonkey2009-02-03

Another thing to note is that the casing of the device is actually a filter - it looks totally opaque but its not to IR.

PCBPolice Electronics Forum - we need some users....please!

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amando96 (author)ste54422009-02-03

Just did that, the voltage(or something) defenantly changes when an IR light is shined on it... so i guess it is... lol

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amando96 (author)ste54422009-02-03

ya i forgot about that, so that normal light cant interfeere with the IR signals...

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UziMonkey (author)ste54422009-02-03

Info is good, SPAM is not..

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