This transistorized circuit is powered by a voltage of 6 to 12 V providing high voltage for a neon lamp. The circuit is from a 90's publication. Modern equivalent transistors can be used.
This low voltage circuit that generates sine signals was obtained from a Texas Instruments integrated...
We found this source in documentation from the 1980s. The power transistor can be the BD137 and...
This is a factory setting that appears on many commercial devices and at various points on this...