Headlight and lantern control (CB7249E)

Found in American documentation from the 90s, this circuit has a timing system for activating the headlamp and lanterns.

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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...