Posted on Feb 7, 2014

A schematic diagram for the remote analyzer is shown. The circuit is powered from a simple 5-V supply, consisting of PL1, 51, T1, abridge rectifier (comprised of Dl through D4), capacitor C1, and a common 5-V regulator, UI. Switch 51 is the on/off control and is optional. The power-supply trans-former used in the prototype is a 12. 6-Vac unit, but

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any transformer that can supply at least 5. 6-Vac will do. The 12. 6-V unit was used solely because of its availability. The output of T1 is full-wave rectified by diodes Dl through D4 and filtered by C1. The bumpy dc output from the capacitor is regulated down to 5 V by UI, a 7805 integrated regulator, LED1 acts as a power indicator to let you know that the circuit is active. The 5-Vdc powers a GPIU52X infrared-detector module* (MODl), which demodulates the 40-kHz carrier used by most infrared remotes. After demodulation, the resulting logic pulses are sent to an oscilloscope via PL2, a BNC connector.

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