Scientist Are Wrong

How did amateur scientist Joe Novice prove a satellite expert wrong?
Satellites provide global coverage of clouds, water vapor, dust, smoke and the ozone layer.

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Minimalist Electronics

Solving an Assignment for the Minimalist Electronics Society
Design an electronic intercom that would allow the group's president and secretary to speak to one another.

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Non-Potentiometer Potentiometer

Build A Non-Potentiometer Potentiometer
How did consultant Leo Smith design a substitute for use as a radio volume control?

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Non-Electric Voice Transmitter

How did D.J. continue his charity radio broadcasts after dropping his cell phone?
A cell phone with a solar charger served as D.J.'s only link to the radio station.

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Hit the Bulls Eye

The simplest way to light the LED when a ball strikes the bull's eye?
ohn Archer spent a decade designing hardware and writing code for microprocessor-controlled games manufactured by a toy company.

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The Simplest Light-to-Light Converter

Prof. Lichtmeister wanted an ultra-simple demonstration of how an LED would glow.
How light can be intercepted by certain phosphors or various optoelectronic sensors.

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Homemade Super Capacitor

What is the Mystery Component?
How to use a Jameco Super Capacitor as a memory back-up capacitor,

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Pressure Sensor

What is the Missing Component?
Build a pressure-sensitive tone generator that can be controlled with a free finger or even an elbow.

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Simple Liquid Water Detector

What is the Missing Component?
Design a circuit that would trigger an LED when a few millimeters of liquid water is present .

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Rotation Detector

What is the Missing Component?
Video game designer Bob Wheels needed an inexpensive, counter-clockwise rotation detector.

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Wireless Chime

What is the Power Supply?
Big Bucks Bank needs a totally wireless, stand-alone means to sound a chime when a visitor enters the lobby of its bank.

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Photodiode or Photoresistor

What is the Missing Component?
A spectrally selective photometer that detects a narrow band of red light emitted by a red traffic light, the brake light on a vehicle or the beam from a red diode laser.

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Pulse Generator

What is the Missing Component?
Certain kinds of miniature switching vacuum tubes might work in this circuit, but the mystery component is a solid state device.

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