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