infrared spy circuit

Infrared Receiver Surveillance Circuit
Spy Circuit

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Infrared Receiver, SpyCircuit
This is a Very Powerful Infrared receiver and spy circuit that has Law Enforcement applications for receiving infrared 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. Most any will work.