FSK modem

The most notable feature of this circuit for an FSK modulator/de-modulator is its t: •• treme simpli-city: it requires only one supply voltage uses only 4 common I Cs is simple to set up The circuit conforms to Kansas City Standard (CUTS) format, i.e. logic 0 = 1200 Hz, logic 1 = 2400 Hz, and the transmission rate is 300 Baud.