I have never found a such remote tester circuit that can be as easily made as this following. Remotes work with a digital signal which is nothing but 1?s & 0?s. We can see remote working or not, in our mobile’s cameras too.
Here is a handy gadget for testing of infrared (IR) based remote control transmitters used for TV, DVD, DTH etc.
Actually it is nothing else than a simple light detector made upon a cheaply available LDR. This is just a light detecting circuit. We shouldn’t expect from it to work from far distance, etc. It’s a basic light sensing circuit. This circuit consists of one LDR, one CR2025/2032 battery, one BC547/548 transistor, one biasing resistor(100K). LDR is light detecting resistor whose resistance increased in dark, and decreases in light. This is not based on Infrared sensor IC, which supplies the binary data received from remote. It can be easily made without any PCB, vero and can be fitted well within a matchbox. Only thing to be taken care of, is to put LDR in 1cm deep from matchbox, with a hole in front of it. We don’t want normal light to easily affect this LDR and give undesirable results. The schematics below.
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