False alarm (CB6775E)

This circuit was found in a 90’s Electronic Design. The circuit uses components that are still common in the market and indicated for use in the car.

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Telephone dialer (CB21268E)
This circuit was found in Electronics Now. With it the dialing signals of a telephone are...
Dual-intensity LED (CB22128E)
This circuit switches the brightness of the LED. We found it in an English documentation....
Simple metal detector (CB7960E)
This circuit already explored in several diagrams in this section was found in a 90’s Popular...