This simple circuit with two transistors was found in a 1985 publication. The power can come from batteries or battery, as consumption is very low.
This circuit indicates a digital value through a moving bar. The circuit is TTL and must be...
This circuit operates with input voltages from 50 to 140 V providing an output of 12 V under...
The circuit presented, found in a year 2000 publication, is formed by two alarms that trigger...