This circuit generates various types of sounds and can be used as a toy. The circuit is from Radio Electronics from January 1983. The amplifier can be replaced with a more modern type.
This circuit allows the division of the frequency generated by an oscillator with the 4069 by two,...
Found in ancient documentation, this circuit uses a high voltage transistor of the time. Observe...
This circuit with TTL compatible output was found in a 1968 US documentation. The circuit is...