This high voltage oscillator with a neon lamp was found in a 1969 documentation. The circuit is synchronized by pulses of 1 kHz. The power voltage is 160 V.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...