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 is nothing more than a voltage quadruplicator that can generate close to 1 000 V from the...
In the figure we have an application of an oscillator 4013 as voltage multiplier. It consists of a...
This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be...