Continuity Test (CB18281E)

The circuit in the figure is a useful continuity test serving to check the condition of circuits and components with excellent sensitivity.

| Clique na imagem para ampliar |

Photo Remote Control (CB18343E)
This very simple circuit uses a phototransistor and a very sensitive relay (reed type) being used...
Power failure alarm (CB22534E)
We found this circuit in Radio Electronics magazine from January 1958. It uses a neon lamp as the...
Audio wattmeter (CB19768E)
The integrated circuits in this application are not very common today. One consists of an A / D...