Speakerphone


Posted on Mar 5, 2013

This circuit consists of two audio channels, a control circuit, and a hybrid irlterface circuit. The gain of each audio channel is con· trolled by the control circuitry, with the use of a voltage controlled amplifier (VCA). The inputs to the control circuit are obtained from each of the audio channels. The hybrid interface circuit performs three important functions. First, it couples the Tx channel signal to the telephone line.


Speakerphone
Click here to download the full size of the above Circuit.

Second, it couples the signal on the telephone line to the Rx channels. And, finally, it cancels a majority of the Tx signal that can couple into the Rx channel. The amount of Tx signal that appears on the Rx channel is called sidetone.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Simple BFO Metal Detector
GSM Automatic Meter Reading
iButton DS1990A Lock
ATtiny12 fuse
RF probes
AC time delay circuit with 555
Stereo Led Vu Meter
Sawtooth and Squarewave Oscillator
Cosine wave Oscillator
Giving a false speed reading
uPC1891 application circuit
Data acquisition system circuit



Top