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 slows down a pulse applied to its input. The delay depends on the capacitor and...
September, 2017 - Mean Well DC-DC regulators from 10 to 30 W are already available on Mouser...
This circuit was found in Siliconix documentation from the 1980s. Common comparators or...