This circuit turns off after a time given by capacitor C1. This component can have from 1 to 1,000 uF depending on the desired time. The circuit is from an Electronics Now from June 1995.
The figure shows how to use CMOS inverters as amplifiers. The circuit is from a Radio Electronics from...
This interesting circuit measures the distortion of the sinusoidal voltage of the power grid. We...
This circuit was found in an American publication from the 50's. The transistors are made of...