This circuit was found in an old American publication. It is valid for any operational. Formulas for component calculations are given next to the diagram.
The maximum time of this timer depends on the capacitor next to the adjustment pot. With 2,200 uF the...
We found this circuit in a Radio Electronics issue from August 1974. The frequencies generated depend...
Found in a 1967 EEE, this circuit generates a constant amplitude signal, stabilized by a zener...