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 found this circuit in the February 1970 issue of Radio Electronics Magazine. It uses an RCA...
This power source can supply currents in the range of 100 mA to 1 A, depending on the transformer and the...
This circuit consists of a constant current source for charging 12 V batteries. The charge is...