This circuit was found in the September 1992 issue of Radio Electronics magazine. The circuit does not use a transistor to drive the relay and has no adjustments.
Found in a 1990s Motorola documentation, this high voltage circuit uses a PUT that is not a common...
This circuit was found in a Popular Electronics from the 90s. The frequency range generated...
This circuit was found in a 1963 magazine, but can still be easily assembled with some current...