We found this circuit for video games in a Radio Electronics magazine from August 1977. The transistor can be any common RF type that reaches the desired signal frequency.
November 2016 - Mouser Electronics already has Maxim's MAX17245 DC-DC step-down converters to...
This variable frequency oscillator with the 4093 was found in a Popular Electronics from the 90s....
This circuit was found in an old Philips publication. The circuit supplies a voltage corresponding to 4.5 V...