This circuit triggers a Sonalarme when the LED used as a sensor receives light. The circuit was found in an old documentation, but the components used are all current.
Found in documentation from the 1970s, this circuit uses an oscillator and a display to warn of...
This circuit indicates whether a cable or wire is energized by simply approaching its antenna. The...
Using bipolar, FETs and unijunction this long-lasting timer can reach 10 hours with good quality...