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.
This circuit was obtained in an Argentine publication from the 1970s. The circuit can still be...
This circuit has an accuracy of 1%. The components used must be precision as well. The input...
In the figure below we have the typical circuit of an automotive star alternator with the...