This circuit has the spark duration controlled by a 555 timer. The circuit was found in the 1990 special issue of Radio Electronics Experimenter magazine.
This circuit works with small 5 V incandescent lamps but can be modified to operate with LEDs. The...
This low power bass booster is from the 1977 National Semiconductor Audio Handbook. The circuit is...
This circuit is from an old documentation. Integrated circuit 723 is not common today. The power...