This circuit was found in a 90’s Electronic Engineering. The signal is sinusoidal with the frequency given by the non-value components that form the resonant network.
In this circuit from a 1991 publication, we can use the 2N2646 unijunction transistor and the...
This circuit is from a technical documentation from the 70s. It makes use of married transistors in a...
Rechargeable Nicad batteries type AA, C or D can be recharged with this circuit, which is nothing...