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.
May 2016 - It can be obtained from Mouser Electronics new microcontrollers from Texas MSP430...
This passive circuit was found in a 1980s documentation. The circuit serves to indicate the...
This circuit can be adjusted to time timer intervals up to1 hour using a 2,200 µF capacitor and a...