This simple low power triplicator was found in 90’s American documentation. The diodes can be general purpose types and the frequency is determined by the RC network of the 555.
We found this circuit in a 1985 technical publication. The circuit uses PUTs to drive lamps....
This precision circuit can be implemented with other operational ones. We found it in a...
This simple circuit uses a car ignition coil. The circuit appeared in the 1983 Radio Electronics Annual...