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.
Found in documentation from ON Semiconductor, this circuit provides a rectangular output signal with...
We found this circuit in 1964 General Electric documentation. The circuit works with mechanical...
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...