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.
With two operational amplifiers this circuit generates triangular and rectangular signals at a...
This circuit of an EDN divides the input pulse frequency by even values. The circuit is TTL and...
This circuit was obtained from an English publication from 1977. The integrated circuit is a...