Suggested by Raytheon in 1967 documentation this circuit uses a lightbulb and LDR optical coupler of the time. The transistor determines the maximum current.
This circuit can generate 10 MHz signals depending on the crystal and has excellent stability....
Found in a 70s documentation, this circuit uses integrated circuits of the time, without further...
We found this circuit in an old publication. The transformer has a 9 or 12 V secondary, and the...