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 is a traditional audio amplifier configuration with complementary Darlington transistors. The power...
Found in 1967 General Electric documentation, this circuit is intended for the control of...
In the figure we show a configuration for a crystal controlled overtone oscillator using a...