This humidity sensor indicates the different levels of conduction of the sensors through an LED bar. The circuit is from Popular Electronics and must be powered by cells or battery.
This circuit was obtained in an old American manual. The circuit is valid for any operational. The...
This circuit converts a positive CMOS supply voltage to a negative one. We found it in a 90s...
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...