The voltages in an adjusted range in the trimpots are indicated by 3 LEDs. The LEDs indicate when the voltage is below the range, above the range and in the range.
The circuit presented is from a 2006 documentation. It can turn a set of lamps on or off when...
This circuit was found in the December 1993 issue of Electronics Now. With the components shown the...
This circuit is of an old Argentine magazine of the 70's. The difficulty for its assembly is in...