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.
This circuit must be powered by a symmetrical source and has a very high input impedance. The...
This circuit uses two diodes in a doubling configuration to receive medium-wave range signals. The...
This circuit serves to prevent devices powered by 6 V from being left with a power cut. The...