Circuit Diagram Stereo Coder Multplexer

Stereo Coder Multplexer

Stereo Coder Multplexer

Multiplexer consists of 4 TTL ICs and transistors. A 7600-kHz crystal oscillator built with the 3-NAND

The IC’s 2 and 3 of type SN7490. Now think of 76 kHz signal
as a divider of two Werken. Either 38 kHz signal and the output Q Qnot decreased.
Transistors T1 and T2 thus transformed into conduction.
Transistor T3 is added to the linearity
analog switch to improve. The instelpotmeter R 15, 38-kHz
suppression operator can set optimally. When the signal output
still-19 kHz pilot tone added, the strength that can be adjusted
R 13. In order to obtain low output impedance, for output