Issue 1 Sept 2009 |
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Back of the Envelope Calculations |
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Wind Energy Ship |
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Circuit Diagnosis |
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Exploding Capacitors |
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Dave's Rants & Raves |
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Electrodeless Fluorescent Lamps |
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Experimenter's Corner |
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Wireless Battery Charger |
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Good Idea done Badly |
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Bad Solar Powered Birdbath Design |
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What the World needs Now |
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Drinking Fountain from Pond Water |
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Wily Widget, the Lone Inventor |
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Wave Length Indicator |
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Issue 2 Oct 2009 |
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Back of the Envelope Calculations |
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Shippable Energy Container |
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Circuit Diagnosis |
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Vapor Pumping |
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Dave Rants |
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Electrodeless Fluorescent Lamps |
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Experimenter's Corner |
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Light Powered Battery Charger |
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Good Idea done Badly |
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Bad Path Light Design |
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New Products, 2008 |
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New Products, 2008 |
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What the World needs Now |
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PIGEON SCARECROW |
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Wily Widget, the Lone Inventor |
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Fence Alarm |
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Issue 3 Nov 2009 |
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Back of the Envelope Calculations |
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Supercapacitor Home Energy Storage Unit |
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Circuit Diagnosis |
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Connector Woes |
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Dave Rants |
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Hot Rock Geothermal Energy |
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Experimenter's Corner |
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NiMH Battery State of Charge Monitor |
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Good Idea done Badly |
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Bad Alarm Clock |
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New Products, 2008 |
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New Products, 2008 |
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What the World needs Now |
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Drinking Water from Thin Ai |
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Wily Widget, the Lone Inventor |
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Vertically Lifting Security Gate Power Source |
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Issue 4 Dec 2009 |
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Back of the Envelope Calculations |
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Aluminum Pop Can Energy Source |
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Circuit Diagnosis |
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Flaky Garage Door Opener |
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Dave Rants |
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Bad Chinese Capacitors |
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Experimenter's Corner |
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Magnetic Vehicle Motion Sensor |
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Good Idea done Badly |
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Bad Office Chair Wheels |
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New Products, 2009 |
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New Products, 2009 |
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What the World needs Now |
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Wind Power Monitoring Blimp |
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Wily Widget, the Lone Inventor |
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Fireplace Fizzle |
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Issue 5 Jan 2010 |
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Back of the Envelope Calculations |
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Energy Savings Using Voltage Bucking Transformer |
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Circuit Diagnosis |
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Dirty PC Boards |
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Dave Rants |
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Yellowstone Might Explode |
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Experimenter's Corner |
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Measuring Low Value Resistors |
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Good Idea done Badly |
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Bad Computer Power Supplies |
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New Products, 2009 |
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New Products, 2009 |
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What the World needs Now |
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NiMH Battery Tester |
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Wily Widget, the Lone Inventor |
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Solar Powered Wireless Sensor |
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Issue 6 Feb 2010 |
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Back of the Envelope Calculations |
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Long Life Solar Powered LED Light |
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Circuit Diagnosis |
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Motor Speed Controller |
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Dave Rants |
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Inventor Name Fraud |
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Experimenter's Corner |
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Long Range Motion Sensor |
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Good Idea done Badly |
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Disappearing Letters on Key Boards |
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New Products |
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New Products |
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What the World needs Now |
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Tritium Power Generator |
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Wily Widget, the Lone Inventor |
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Coin Operated Telescope |
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Issue 7 Mar 2010 |
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Back of the Envelope Calculations |
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Back of the Envelope Calculations |
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Circuit Diagnosis |
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Wrong LED Wavelength |
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Dave Rants |
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Fading White LEDs |
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Experimenter's Corner |
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White LED Lifetime Tests |
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Good Idea done Badly |
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Another Bad LED Night Light |
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New Products |
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New Products |
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What the World needs Now |
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Long Lasting LED Night Light |
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Wily Widget, the Lone Inventor |
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High Power Flashing LED |
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Issue 8 Apr 2010 |
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Circuit Diagnosis |
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PCB Fabrication Problems |
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Dave Rants |
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Strange Science |
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Experimenter's Corner |
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Charging Alkaline Batteries |
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Good Idea done Badly |
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Bad Fluorescent Night Light |
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New Products |
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New Products |
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What the World needs Now |
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Candle Flame Powered Battery Charger |
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Wily Widget, the Lone Inventor |
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Corona Monitor |
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Issue 9 May 2010 |
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Back of the Envelope Calculations |
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Hydrogen Energy Storage |
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Circuit Diagnosis |
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Circuit Diagnosis |
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Dave Rants |
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Stiff Wires from China |
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Experimenter's Corner |
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X100 Scope Probe |
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Good Idea done Badly |
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Bad Throw Rug |
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New Products |
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New Products |
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What the World needs Now |
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Large Outdoor Thermometer |
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Wily Widget, the Lone Inventor |
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Earth Battery |
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Issue 11 July 2010 |
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Back of the Envelope Calculations |
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Lifted Weight Energy Storage |
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Circuit Diagnosis |
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Cracked Solder Joints |
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Dave Rants |
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Dave's Pet Peeves |
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Experimenter's Corner |
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Earth Signals |
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Good Idea done Badly |
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Bad Rubber Mulch |
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What the World needs Now |
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External USB linked HD UPS |
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Wily Widget, the Lone Inventor |
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Medical Fluid Detector |
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Issue 12 Oct 2010 |
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Circuit Diagnosis |
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Wrong Capacitor Selection |
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Experimenter's Corner |
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Low Power AM Transmitter |
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Good Idea done Badly |
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Solar Powered Car Vent |
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New Products, 2010 |
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New Products, 2010 |
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What the World needs Now |
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Hot Car Cooler |
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Wily Widget, the Lone Inventor |
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Musical Chairs |
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Issue 13 Nov 2010 |
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Circuit Diagnosis |
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Conductive Adhesive Tape Problems |
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Experimenter's Corner |
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Flameless LED Candle Power Boost |
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Good Idea done Badly |
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Bad Carriage Bolts |
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What the World needs Now |
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Switch with Hysteresis |
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Wily Widget, the Lone Inventor |
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Restaurant Table Service Request Flasher |
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Issue 14 Dec 2010 |
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Back of the Envelope Calculations |
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Charge Pump Paradox |
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Circuit Diagnosis |
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Temperature Sensitive MOSFET |
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Experimenter's Corner |
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High Voltage Ceramic Capacitors for Line Powered LEDs |
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Good Idea done Badly |
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Bad 40W Fluorescent Lamps |
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What the World needs Now |
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Bovine Calving Alarm |
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Wily Widget, the Lone Inventor |
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Water Well Pump Motor Indicator |
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Issue 15 Jan 2011 |
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Back of the Envelope Calculations |
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Solar Energy Myth Busting I |
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Circuit Diagnosis |
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Reversed Battery Polarity |
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Experimenter's Corner |
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Optical Fiber Pressure & Motion Test Circuit |
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Good Idea done Badly |
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Bad AC to DC Wall Power Adapters |
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New Products, 2010 |
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New Products, 2010 |
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What the World needs Now |
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Miniature AC to DC Power Supply |
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Wily Widget, the Lone Inventor |
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Underground Gate Opener |
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Issue 16 Feb 2011 |
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Back of the Envelope Calculations |
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Space Mirror for City Illumination |
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Circuit Diagnosis |
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Modulated Light Interference |
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Experimenter's Corner |
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Ultra Low Current Circuit Examples |
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Good Idea done Badly |
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Bark Off Ultrasonic Barking Dog Deterrent Device |
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New Products, 2010 |
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New Products, 2010 |
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What the World needs Now |
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Space Helmet for Yard Work |
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Wily Widget, the Lone Inventor |
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Buddhist Temple Statue Light |
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Issue 17 Mar 2011 |
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Back of the Envelope Calculations |
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Off-Grid Home with Electric Car |
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Circuit Diagnosis |
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Schottky Diode Leakage Current |
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Experimenter's Corner |
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Improved Solar Powered Path Light |
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Good Idea done Badly |
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Bad LED Path Light II |
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New Products, 2010 |
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New Products, 2010 |
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What the World needs Now |
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Emergency Electrical Power System |
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Wily Widget, the Lone Inventor |
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Battery Charging Generator Starter |
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Issue 18 May 2011 |
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Back of the Envelope Calculations |
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Solar Powered Laptop Computer |
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Circuit Diagnosis |
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CFL Lamps with Day Night Switch |
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Experimenter's Corner |
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Solar Alkaline Battery Charger |
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Good Idea done Badly |
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Bad Chinese Steel Products |
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What the World needs Now |
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Garage Door Closer |
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Wily Widget, the Lone Inventor |
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Hidden Panic Switch |
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Issue 19 Aug 2011 |
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Back of the Envelope Calculations |
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Portable Solar Power System for Fence Installers |
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Circuit Diagnosis |
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Gapped Ferrite Pot Core Inductor |
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Experimenter's Corner |
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Human Walk Energy Harvesting Generator |
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Good Idea done Badly |
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Bad Floor Sweeper |
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What the World needs Now |
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AC to DC Power Supply with 40KV Isolation |
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Wily Widget, the Lone Inventor |
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Soap Dispenser Monitor |
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Issue 20 Nov 2011 |
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Back of the Envelope Calculations |
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Long Range Laser Communications |
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Circuit Diagnosis |
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Super Hot Ferrite Transformer |
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Experimenter's Corner |
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Tiny Solar Panels Using Photodiodes |
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Good Idea done Badly |
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Bad Magic Mesh Screen |
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What the World needs Now |
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Broadband Antennas for Metal Shops |
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Wily Widget, the Lone Inventor |
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Touch Activated Battery Powered Latching Relay |
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1st Q 2012 |
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Back of the Envelopes Calculations |
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Water Train |
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Circuit Diagnosis |
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Power Supply Problems - Excessive +5v Supply Current Drain |
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Experimenter's Corner |
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Testing LED Light Intensity |
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Good Idea done Badly |
- |
Bad Alkaline Battery Charger |
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What the World needs Now |
- |
Old style Wind Mill for Electricity Generation |
|
Wily Widget, the Lone inventor |
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Shooting Range Flasher |
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2nd Q 2012 |
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Circuit Diagnosis |
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15 Minute Timer Does Not Time Out |
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Experimenter's Corner |
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AC Current Test Source |
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Good Idea gone Badly |
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Bad Chinese Lag Screws |
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What the World needs Now |
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Big Dial Wind Speed Indicator |
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Wily Widget, the Lone Inventor |
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Illuminated Banister |
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3rd Q 2012 |
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Circuit Diagnosis |
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Swapped Parts |
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Experimenter's Corner |
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25 Watt-hour Battery Pack for Charging Devices through USB Port |
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Good Idea done Badly |
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Bad Bug Zapper |
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What the World needs Now |
- |
Water Heater Flame Detector |
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Wily Widget, the Lone Inventor |
- |
Single Lead-Acid Cell Voltage Monitor |
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4th Q 2012 |
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Circuit Diagnosis |
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Inferior 50 Ohm Power Load Resistor |
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Experimenter's Corner |
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Home Made Current Transformers |
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Good Idea done Badly |
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Pirated Audio Books |
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What the World needs Now |
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An Anti-Theft Hanging Basket Alarm |
