Music On Hold Circuit

Posted on May 10, 2012

When an asterisk * is pressed on the touch-tone phone, TCI a DTMF decoder, controls on-hold logic. Audio from the FM receiver IC4 is.placed on the telephone line when a hold condition is present. RY2 is a DPDT 12-V relay. To place a caller on hold,

Music On Hold Circuit
Click here to download the full size of the above Circuit.

press the asterisk button on the touch-tone phone and hang up the handset.

Leave Comment

characters left:

New Circuits



Popular Circuits

Variable Square wave oscilator with 555 circuit
Bipolar Stepper Motor Driver Circuit
how to make simple vu meter circuit at
io port programing chalange
Single Meter Clocks
Simple applications of neon glow lamps
DIY 2 Layer Boards Circuit
100W power amplifier circuit diagram TDA7293
Sequential timing control circuit diagram