Complete Alarm with NO and NC Sensors (CB24141E)

We found this circuit in the July 1971 Radio Electronics magazine. The circuit activates a Sonalert or a relay for a higher power warning system.

| Clique na imagem para ampliar |

Carbon Microphone Preamplifier (CB12905E)
This very old circuit, from a publication from the 1970s, uses a germanium transistor and two...
Touch Switch (CB16091E)
In the figure we have a very sensitive touch switch circuit. A touch of the sensor causes the...
Mini Central for Intercoms (CB18747E)
In fact, we can say that this circuit found in documentation from the 90s, consists of an intercom...