Door buzzer or alarm (CB20492E)

This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose NPN.

Series Lamp (CB17690E)
The standard lamps consist of features of great importance for the test and repair bench. It is...
FET and Bipolar Amplifier (CB18870E)
This good power amplifier was found in a Japanese magazine from the 1970s. The circuit uses...
Delayed light (CB10091E)
This circuit for incandescent lamps was found in a 70s documentation. The circuit uses an SCR...