Found in American documentation from 1964, this circuit uses transistors from that time, which are not common today. RT2 is a thermistor that compensates for the circuit bias. The frequency is 2.5 kHz.
Found in American documentation from 1964, this circuit uses transistors from that time, which are not common today. RT2 is a thermistor that compensates for the circuit bias. The frequency is 2.5 kHz.