Test your ingenuity with Jameco Challenges and Forrest Mims Puzzlers.
Emergency DIY Resistor
How did engineer Tony Watts improvise a SMT 1MΩ resistor?
Artificial Vegetation Detector
Is it fake or real leaf?
Measure the Most Important Greenhouse Gas?
What electronics instrument did Bob Celsius select?
A Transparent Microphone
What a transparent plastic microphone can do to someone's voice.
Secure Communication between Two Vehicles
How can you safely communicate without a radio?
Joe Novice Thinks Scientists Are Wrong
How did Joe Novice prove the volcanic aerosol cloud was still there?
LED Headlight Detector
Do you think you can design an LED headlight detector? See how smart you are with this new Puzzler!
Build A Non-Potentiometer Potentiometer (NPP)
How did consultant Leo Smith design a substitute for use as a radio volume control?
Design an Electronic Intercom for the Minimalist Electronics Society
How did engineer Brown solve this problem without using conductors, power lines or cell signals?
Light up a LED without
a power source
The catch: the game should not use a battery or external source of power.
A cell phone with a solar charger served as D.J.'s only link to the radio station.
How to create a homemade super capacitor from local pet store items
What did the professor add to his lemon concoction?
The Simplest Light-to-Light Converter
How did he combine the smallest number of components to do what the phosphor card did?
Help sense the flooding
Design a circuit that would trigger an LED when water is present.
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.
Big Bucks Bank needs your help to solve their power supply dilemma
Lithium batteries might work, but maybe not for a full 15 years.
Help Bob Wheels find a durable rotation sensor
That can withstand lots of punishment and the busy hands of a teenaged game player.
Give a quick pulse of power to a laser diode
Cerain kinds of miniature switching vacuum tubes might work in this circuit.
Discover the heart of the monochromatic light detector
The missing component is clearly some kind of photodiode or photoresistor. But what kind?
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