Help understanding an IR Receiver circuit.

Andre's picture

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Joined: Apr 19, 2019

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Help understanding an IR Receiver circuit.
April 19, 2019 - 10:30am

I am using the following circuit from https://circuitdigest.com/electronic-circuits/ir-transmitter-and-receiver-circuit as an IR Receiver.

When I stand far away and point a TV remote at it and push a button, the LED lights up; hence it appears to be working. However if I get within 1m of the sensor i.e. just stand in front of it without the remote, the LED flickers continually - almost as if a signal is bouncing off of me.

The sensor that I am using is not a TS0p1738 but rather the following: ZD1952 

I therefore have two questions:
1) Why does the LED shine when I stand near the sensor but if I am further away only when pressing the remote.
2) Do I need to make same changes to accommodate the fact that the receiver is a ZD1952?

Andre's picture

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Joined: Apr 19, 2019

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I appeared to have a cold
April 19, 2019 - 11:21am

I appeared to have a cold joint. It seems to have come right now. Also I flipped the PNP as apparantly this is the wrong way round in the diagram.

John_Kripto's picture

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Joined: Aug 11, 2018

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So it it working now?
April 22, 2019 - 9:05pm

So it it working now?

Remeber the LED glows for any signal picked up buy your sensor. Since the sensor picks up IR light, there are chance that it uis responding to sunlight. Since the sunlight also as IR light