This space mark demodulator for FSK signals was found in an American telecommunication documentation from the 1980s. The circuit operates with 2025 Hz and 225 Hz mark space signals.
Random pulses are produced by this multiple oscillator using unijuncion Transistors. The...
Originally in 1986, this circuit was developed to operate with microcomputers of the time like the...
This circuit was found in a 1976 documentation. It can be used with old tape recording mechanisms for...