Infrared-Led based Wireless Data & Voice Communication withCircuit

Posted on Feb 6, 2014

Objective of this project are to Design a circuit of an electronic infrared communication system, develop new ideas to implement this circuit purposely, to study the circuitry and different types of components & DTMF generator, DTMF decoder, op-amp and infrared-LED in the circuit. The main part of Circuit is an amplifier. This sound signals (even at a distance of 2 meters from the mic)

Infrared-Led based Wireless Data & Voice Communication withCircuit
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are picked up by the condenser microphone and converted into electrical variation, which are amplified by the op-amp. Operational amplifier IC- 741 is use in the inverting mode with a single supply using divider network of resistor the gain of IC can be set be varying the feed back through R5/6 resistance (can place a 1M variable) here the output of IC is further amplified buy the push-pull amplifier using transistor BC. 548/558 pair, in this circuit are R2 is feed back resistance with R1/8 and C1/3 to connected IC-741. The IC`s pin 2 is connect VR1 (variable resistance) through connect to O/P of T1 (transistor) also use 6volt DC.

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