This circuit was obtained in a 1978 publication. The supply can be symmetrical from other voltages. Frequency can be changed by changing the capacitors.
Found in a 1964 CQ magazine this circuit consists of an automatic telegraphic key, providing the...
Found in a 1967 American electronics magazine, this circuit has an input impedance of 2000 ohms....
This circuit can generate signals from 80 to 800 Hz with an amplitude of 0.3 V. We find it in a...