Infrared Remote Control Tester

Posted on Feb 7, 2014

The infrared detector module (GP1U52X) (Radio Shack 276-137) provides a 5 volt TTL pulse train corresponding to the digital code to the button of the remote control. In the lower circuit, the module output normally low a signal and a positive going pulse train whena signal is present. Other detector modules that an inverted output is in the upper drawing, which showed type I,

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but I do not have the part number, I think from a video recorder. The pulse sequence, the digital codes of special keys is available with information directly from the manufacturer. Since the pulse train occurs, the 4. 7uF capacitor charges to approximately 3 volts and the capacitor voltage minus a diode drop appears above the 470-ohm resistor, a collector current of the 2N3904 or 2N3906 about 5 milliamperes. The collector current of the first stage flows into the base of the output transistor (2N3053 or MJE34), which provides about 250 mA in direction. If the pulse train ends of the capacitor discharged slowly through the bottom of the first transistor stage left, the Christmas tree lights for about 1 second. The little Christmas lights will operate over a wide voltage range, so you can use bulbs from almost any string, but spheres of short strings (35 or less) will probably run longer at least 5 volts. The circuit can be a small 9-12 volt DC, 250 mA wall transformer or operated higher. It can also be an additional 1000 uF capacitor filter on the DC output if the wall transformer no built-in capacitor. For use with a 9 volt battery, the light bulbs are replaced by a simple LED and 680 Ohm resistor and the output transistors by low signal transistor (2N3904 or 2N3906) can be replaced. The total power is about 25 mA with LED lights, standby and 15 mA when the LED should be.

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