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Electronic Surveillance – Infrared “Voice” Receiver Circuit

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This is a Very Powerful Infrared voice receiver circuit that has Law Enforcement applications for receiving voice transmissions from a infrared transmitter quite a distance away without using optics.
It is beefed up to amplify a very small infrared signal that enters Q1. The original Phototransistor (Q1) was a Radio Shack 276-145 Infrared Phototransistor.