Analogue LED Chaser Light

摘要

The circuit shown here is formed of nine inverting transistor amplifier stages connected in series with an LED connected between emitter and ground. The output of the final stage connected to the input of the first stage. The principle is similar to the ring oscillator described by the author elsewhere in this edition. Similar but not identical, since the stages in this circuit have additional delay elements formed of a 33 kΩresistor and a 47 μF electrolytic. The circuit operates with any odd number of LED stages of your choice, for instance with nine (as shown here).