This circuit was originally suggested by General Electric in 1966 documentation to power decorative high voltage neon lamps. The transformer is 7,500 V for a current of 4 mA.
This is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....
This circuit was adapted from an Italian publication that no longer exists. This is “Onda Quadra”...
This FET stage circuit was obtained from old American documentation but can be applied to any FET....