This alarm oscillator was found in the December 1974 issue of Radio Electronics magazine. The power transistor must be equipped with a good heat sink. The Frequency basically is given by C1.
In the figure we have a current source that can be both positive and negative, depending on the...
This immobilizer circuit for vehicles was found in a 80’s Hands On Electronics. The circuit...
We found this switching circuit in a technical documentation from National Semiconductor. The...