This simple clock can be used to generate signals up to 100 kHz, depending on the crystal. We found it in a 1967 documentation. Note the high supply voltage.
This circuit is from an Electronics World of 1964. The circuit can be made with modern...
We find this circuit in a Radio Electronics of July 1984. It consists of the traditional version of 1 A...
This circuit was found in the June 1990 issue of Radio Electronics magazine. The maximum current is 1...