This circuit indicates a digital value through a moving bar. The circuit is TTL and must be powered by 5 V. We find this circuit in a Texas Instruments optoelectronics manual.
This circuit is from an old publication, but it can be assembled with modern components. We can...
The purpose of this circuit found in a 1995 magazine is to monitor an alarm via telephone. When we...
Indicated for testing remote controls, this circuit was obtained from the June 1997 issue of...