Low Voltage Test (CB22158E)

This is a simple voltage tester for voltages from about 2V to about 15V with the indicated resistor and red LEDs.

Old Fashion 2 Transistor MW Radio (CB945E)
This two-transistor MW radio was found in a publication from 1958. It uses one of the oldest type...
Active antenna (CB8923E)
Found in a 1988s Radio Electronics, this circuit uses transistors of general use to increase the...
5V x 3A Regulator (CB5468E)
This circuit can be applied to other 3-terminal regulators and equivalent transistors can be used....