Found in a 1980s English magazine, this trigger circuit can have different types of inputs depending on the sensor and type of action on the controlled load.
This circuit can also use other series operational amplifiers such as MC33172, MC33174, MC35171,...
This simple transistorized radio was found in a Japanese magazine from 1960. The phone must be...
This circuit that draws 1 out of 8 LEDs was found in an 80's American documentation. The circuit...