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The integrated infrared receiver circuit with pre- amplifier

2015-01-01 20:05  
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The integrated infrared receiver circuit with pre- amplifier
In the circuit, it uses the integrated amplifier, so the circuit is simple with small size. It uses the TDA4050 IC, and the weak infrared signal is received by the photosensitive diode VD,then it is amplified by transistor. As a result of the condenser lens ( diameter is about 15mm, focal length is about 30mm), it can increase the effective distance with 20 to 30 times. Capacitor C can effectively reduce the range of 50 ~ 100Hz low-frequency interference signals.