Light-Wave Voice-Communication Transmitter Circuit


Posted on Feb 2, 2013

This transmitter uses a 741 op amp as a high-gain audio amplifier, which is driven by a microphone. The output of the 741 is coupled to Ql, which serves as the driver for a LED. Potentiometer R1 is the amplifier`s gain control. Miniature trimmer resistor R6 permits adjustment of the base bias of Ql for best transmitter performance. Gain control R1 can be eliminated if CI and R2 are connected directly to pin 2 of the 741.


Light-Wave Voice-Communication Transmitter Circuit
Click here to download the full size of the above Circuit.

For maximum sensitivity, increase the value of R2 from 1 to 10 and use a crystal microphone with a large diaphragm.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

High Voltage power Supply
Simple Ir Transmitter
Single Ltc Power Supply Circuit
230 Volt AC To Inverter SwitchingCircuit
ECE 3434 Electronic Circuits II
arm7 slicker article
12ft GPS Wall Clock
555 tri-state acousto-optical logic circuit
Keying oscillator circuit



Top