We found this circuit in an American publication from the 90s. It generates pulses that can be modulated in amplitude. The supply can be done by voltages from 5 to 12 V and the frequency depends on C1 and C2.
This transistorized circuit is powered by a voltage of 6 to 12 V providing high voltage for a neon...
This circuit is from an Electronics World of 1968. The transistors are of the time and the power...
This circuit is from a 1972 German magazine Funkshau. The circuit can use BC548 transistors...