This circuit drives 4 sequences of 5 LEDs that can be of any color. The frequency depends on the characteristics of the photosensor. The circuit is from an 80's documentation.
This circuit was found in a 1973’s Japanese magazine. It uses transistors of the time and is...
This cassette player motor speed control was found in the January 1991 issue of Radio Electronics...
This circuit was obtained in a 1982 English magazine. The purpose of this circuit is to make an...