This circuit was found in an Elektor from the 90s. It is a circuit that generates different types of sound effects. The components are still common today.
August 2016 - It can be obtained from Mouser Electronics the new temperature and humidity sensors from...
April 2017 - These new Texas Instruments switches are available from Mouser Electronics. They can...
This circuit was obtained in a Motorola manual from the 70s. The integrated circuit is from that...