Found in American documentation from the 1980s, this circuit makes use of components of the time, which are uncommon today. The circuit detects the approach using a sensor formed by metal plates.
This simple voltage doubler provides a continuous voltage at its output that is twice the peak...
This simple 741 circuit was found in the August 1993 Electronics Now magazine. The source must be...
This circuit emits a sound at regular intervals to prevent you from falling asleep, for example. It...