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Annoying TV Sound Circuit

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Have you ever heard that ringing sound coming from an old TV? Well, that never happens anymore because TVs today use LEDs or other advanced technology. That old high-pitched whine came from the transformer that drove the cathode ray tube. Even today when I hear that sound it sends a... Read more »

Game Show Buttons

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In this project, taken from Charles Platt’s book Make: Electronics, we’re going to breadboard a fairly complex circuit using 555 timers and an OR logic gate. Using these and some other, common components, we’ll build a game show button system. When one button is pressed, it automatically locks the other... Read more »

555 Timer Ball Whacker

555 ball whacker

This project uses a simple 555 timer chip and a feedback loop to control a servo-controlled wooden arm. Whenever an object comes close to a photosensor mounted on the end of the arm, it blocks the amount of light detected, which triggers the arm to swat the object away. Read more »

Dish-O-Tron 6000

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I’m absentminded in general, but especially when it comes to the dishwasher. I can never remember whether the dishes are clean, whether the machine needs to be run, or emptied, or whatever. I needed a solution to this problem. My first thought was to hang a flippable sign on the... Read more »