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Components for the transmitter
Normal 1W white LED
Condenser microphone
74HC4046 PLL IC
CA3130 BiMOS Op Amp IC
100 kohm
5 kohm
50 nF
1 kohm
2 Mohm
100 pF (x2)
5.6 kohm (x2)
Components for the receiver
Centronic OSD100-E (Eye-response photodiode)
74HC4046 PLL IC
CA3130 BiMOS Op Amp IC
33 kohm
0.1 uF
240 kohm
5.6 kohm (x2)
100 pF (x2)
10 uF
1 nF
100 kohm (x2)
250 kohm trimpot
Mono audio socket (to speakers)
Two 9V batteries.
Waveforms Taken at White LED Output
Waveforms Taken at White LED Output
Fig. 1. Waveform without voice input.
Fig. 2. Waveform with voice input.
Waveform at the Receiver
Fig. 3. Waveform at receiver output (i.e. at the audio socket).
Circuit Schematics
Pictures of the Project
Video Demonstration
Source : extremecomputation.blogspot.in
