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 is from 2002 documentation. It injects a signal into a power amplifier and measures the...
The integrated circuit used in this project is not the most common. The use of a crystal...
This configuration was found in an American publication from the 90s. Operators admit equivalents just...