A selection of brain twisters to test your ingenuity and challenge you to solve the missing link. Beware, they are not as easy as they look.

A Transparent Microphone What a transparent plastic microphone can do to someone's voice.	LED Headlight Detector Do you think you can design an LED headlight detector? See how smart you are with this new Puzzler!
Joe Novice Thinks Scientists Are Wrong How did Joe Novice prove the volcanic aerosol cloud was still there?	Design an Electronic Intercom for the Minimalist Electronics Society How did engineer Brown solve this problem without using conductors, power lines or cell signals?
Build A Non-Potentiometer Potentiometer (NPP) How did consultant Leo Smith design a substitute for an analog potentiometer for use as a radio volume control?	A Non-Electronic Voice Transmitter A cell phone with a solar charger served as D.J.'s only link to the radio station.
Light up a LED without a power source The catch: the game should not use a battery or external source of power.	The Simplest Light-to-Light Converter How did he combine the smallest number of components to do what the phosphor card did?
How to create a homemade super capacitor from local pet store items What did the professor add to his lemon concoction?	Help Joe Rhythm's one man video be a success Build a pressure-sensitive tone generator that can be controlled with a free finger or even an elbow.
Help sense the flooding quickly Design a circuit that would trigger an LED when water is present.	Help Bob Wheels find a durable rotation sensor That can withstand lots of punishment and the busy hands of a teenaged game player.
Big Bucks Bank needs your help to solve their power supply dilemma Lithium batteries might work, but maybe not for a full 15 years.	Discover the heart of the monochromatic light detector The missing component is clearly some kind of photodiode or photoresistor. But what kind?
Give a quick pulse of power to a laser diode Cerain kinds of miniature switching vacuum tubes might work in this circuit. But the mystery component is a solid state device.

Top of page