Found in Popular Electronics from the 90s, this circuit generates signals in a frequency range set to R7 and basically determined by C1. Operational and equivalent transistors can be used.
This ground-based circuit was found in 1990s American documentation. The transistor can be any...
We found this circuit in a Radio Electronics issue from November 1976. The circuit is for vehicles of...
With this circuit it is possible to obtain a voltage modulated in amplitude with a maximum current of...