Two meter amplifier (CB8980E)

This circuit for the two-meter band of radio amateurs was found in 1980s documentation. Transistors are types of the time. The circuit gain is 14 dB.

Optical Sensor Shield (CB4861E)
Originally, this 2000 documentation circuit was created to operate as a sensor for the parallel...
Transistors tester with a multimeter (CB3904E)
For those who have multimeters that do not test transistors, in the figure we have a circuit that...
Remote control expander (CB8396E)
Used with infrared remotes at the time, this circuit was found in a 1991 RE Experimenter Handbook....