This circuit was found in a 1967 General Electric documentation. Tunnel diodes can oscillate at very high frequencies. These are not currently easy to obtain components.
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...