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  • Simple circuit for lithium battery charge meter

    I wanted a simple meter using 4 LEDs to display the charge of a lithium battery. My project used a single battery(1S), so it needed to display voltages between 3...
  • electronics - circuits

    This is collection of electronics I've designed. workbench tools and testing equipment Howto build a zener diode tester How to build a cheap 3A regulated power supply How to build...
  • Active pest control for basement, attic, or crawl space

    Description This is a humane pest control system for enclosed spaces such as attics, basements, and crawl spaces. It uses passive infra-red(PIR) sensors to detect motion, and activate ultrasonic alarms...