This circuit for musical instruments was found in a 90’s Elektor. The circuit still applies, as the components used can still be obtained with some ease.
The same basic audio oscillator as the CIR15855E can be modulated automatically by a relaxation...
This configuration was found in a 1988 documentation. It is a touch lift drive system. The circuit...
We found this simple timer in a Raytheon documentation from the 60s. The transistor is made of...