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.
We find this circuit in American documentation from the 1980s. It consists of a frequency folder...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
One pulse in the output is produce at each 5 pulses applied to the input. The circuit uses CMOS...