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.
The duration of the output pulse in this circuit depends on C. This capacitor can have values in...
This circuit, found in a 1979 documentation, consists of a small inverter that applies a voltage to...
This circuit was developed to test suspect 4001 and 4011 integrated circuits. The circuit is from...