This circuit for very low frequencies was found in an American documentation from the 90's. Transistors are for general use and the frequency depends on C1 and C2.
This circuit was taken from the 1967 General Electric SCR Manual. The circuit can use virtually any...
Found in National Semiconductor documentation from the 1980s, this circuit employs a power...
The different aspect of this source is the use of a 12 V lamp as a current regulator together with a...