Circuit Project Electronic

A monolithic phase locked loop for data communications. The IC contains a basic phase locked loop for tracking an input signal within the pass band, a quadrature phase detector which provided carrier detector and an FSK voltage comparator which provides FSK demodulation. In the circuit shown, the IC is used as an FSK demodulator such [...]

Uses MT8870 DTMF decoder and PIC microcontroller to decode telephone tones
Read more original source:
http://www.pira.cz/dtmfdec.htm

Latching The 567 Output By IC Tone Decoder LM567
1 circuit is model Manual Reset. 2 circuit parts are model Logic Reset.
The 2 both of circuits show the value that necessary only. For RL be Load of the circuit. The output will liberate a signal is unfinished forever [...]