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Can anyone explain the Working of laser based voice transmitter and receiver Circuit?
u can refer the circuit here:
i want the clear explanation of each component!
http://www.electronicsforu.com/efylinux/circuit/feb2003/jan02_lasertorch.pdf
Transmitter:
The mic is the audio input. C1 is a coupling capacitor that connects the audio from the mic to T1. T1 is a transistor that is used to amplify the audio a bit. C2 couples the audio to IC1 which amplifies it some more. The audio from the IC is then routed to T2 which modulates the power to the LED. This puts the audio onto the light beam. VR1 is a variable resistor which adjusts the gain of the IC. C3, C4 and R7 are power filters that remove noise from the power supply. The other resistors just supply the right voltage to the various parts.
Receiver:
T3 is a photo sensitive transistor which receives the laser from the LED transmitter. The transistor puts out a signal that is proportional to the light from the LED. This not only receives the signal it also demodulates it. C5 couples this audio to T4 and T5 which amplify the signal. The signal is them coupled through C8 to VR2. VR2 is a volume control for IC2. IC2 amplifies the signal more and drives the speaker, LS1.
I hope that's detailed enough for you.
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