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 power supply can sources currents up to 22 A to a load. Voltage is 12 V and the transistor...
For signals up to about 500 kHz modulated in amplitude and transmitted by the power network, the...
This circuit was obtained in a European documentation of the 80's. The circuit uses common...