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 was found in a 1997 magazine. It uses a CMOS 4060 circuit powered by 12 V which is...
This circuit is from the Motorola Linear Databook of 1990. The values of the components depend on the...
This circuit uses a FET and a BJT to give a x300 gain for the input signal. So a 50 mV signal at...