This traditional configuration found in a Radio Shack document can use 2N2646. More keys can be added, and the power can be supplied with voltages from 9 to 15 V.
The frequency of this pulser depends on the capacitor and the characteristics of the relay. The...
We found this circuit in the May 1990 issue of Radio Electronics magazine. The circuit is powered by...
This circuit of old American documentation (1965) can be applied to any transistor. | Clique na...