This circuit can be set up in any computer you want to switch on/off by bringing your finger or any object close to the sensor.
This simple circuit is made in order to regulate the luminous intensity of one or several incandescent lamps, or, as we know them, light bulbs, with a potentiometer.
This led clock circuit is quite complicated to assembly, because of the great quantity of connections it has, but the result is quite visible.
This clock is for nostalgic people from “another electronic age” (without microprocessors). It’s a digital “old fashioned” clock and it’s already seen too many winters.
A very precise digital thermometer with LM35 probe (0,1 degree of freedom).