Full Comparator (CB6548E)

Applying an operational of the time, this circuit of an old documentation can be elaborated with modern operational. The feed must be symmetrical.

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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...