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.
The Texas Instruments TPS7A92 integrated circuit consists of a low-voltage (LDO) linear voltage...
Found in a 1969 EDN, this high current circuit, not indicated in the documentation, uses...
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...