Multiplexed BCD Driver (CB20908E)

This circuit was found in an Electronics Now from the 80's. The circuit is designed for 3-digit displays. The circuit is TTL.

| Clique na imagem para ampliar |

Intercom with telephone (CB7829E)
Old phones with dials can be used in a simple home intercom system, as this circuit from Popular...
Precision Light Alarm with 741 and CMOS (CB25486E)
This circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit has a...
Inverted Polarity Indicator (CB16580E)
This simple circuit indicates if the polarity of a load is reversed when it is connected to a...