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30 Dec 2009

This page details the construction of a prototype dye laser that is intended for initial checking of some parameters — for example, I want to know whether a simple design will threshold “easy” dyes with minimal input energy. In principle, the answer is already known to be “Yes”; but in practice it may not be so easy. The laser will be operating close to margins, and any sacrifice of efficiency will be difficult to work around. [via]

DIY Flashlamp-pumped organic dye laser – [Link]

27 Dec 2009

This 6V6 amp was built following the push-pull (PP) EL84 / 6V6 Dynaco A-410 output transformer schematic. There are a few minor deviations from the original schematics. Instead of Dynaco transformers, Hammond 1608A audio output transformers and a Hammond 272HX power transformer were used.

DIY Push-Pull (PP) 6V6 Tube Amplifier – [Link]

27 Dec 2009

Ever find yourself in need of some extra ADC capabilities? Maybe you have a micro with no ADC built in, maybe you’ve used up all your ADC pins already, or maybe the integrated ADC doesn’t provide a high enough resolution. This is where a custom-built Capacitor ADC can become very useful.

Low-cost ADC using only Digital I/O – [Link]

25 Dec 2009

Building a high-power LED light with adjustable color temperature.

jiskar writes:

The goal of this project is to develop an energy efficient lighting system that not only produces light, but that produces light with a color and spectrum that actually has a positive influence one one’s biological and mental state. Just like sunlight.

Color temp tunable lamp prototype – [Link]

25 Dec 2009

MAKE presents: Ohm’s Law

Voltage, Current, and Resistance – three of the most important electrical properties, are elegantly intertwined by way of a simple equation; V = IR, better known as Ohm’s Law. Get to know this fundamental tool of electronics engineering – you’ll be glad you did! [via]

25 Dec 2009

Peter Allan writes:

The USB Hourglass combines a sand timer with a rotating mechanism and an optical beam through the center of the timer to observe the falling sand. The amount of light reaching a detector is digitized at frequent intervals and processed by a microcontroller to determine when to rotate the hourglass. [via]

USB Hourglass random number generator – [Link]

25 Dec 2009

The PropScope is a two-channel oscilloscope that is capable of reading 25 million samples per second with ten bits of resolution over one, two, ten, or twenty volt peak-to-peak waveforms. Power is provided through the USB port requiring only a single cable to connect the PropScope to any laptop or desktop PC.


  • 2 input channels
  • 25 Msps Maximum Sample Rate
  • 20 Vpp maximum input range (-10 V to +10 V when DC-coupled)
  • 10-bit input resolution over either the entire 20 Vpp range, or selectable 10, 2, and 1 Vpp ranges.
  • 1x/10x selectable probes

PropScope: USB oscilloscope from Parallax – [Link]

20 Dec 2009



Following up the post “Electronics Design Contest: What Is It?” we are impressed seeing what that device is. After almost 2 months a young tech wiper-snapper from New York did found the answer. It’s a “Better mousetrap” maybe the best mousetrap, a high tech electronic, ultrasonic, pneumatic mousetrap. You can read more information and check a video of “Better mousetrap” working on this page.  

Telovation.com contest: Answer found! – [Link]

20 Dec 2009

Fame - YoGen - 1

The YoGen® by Easy Energy, Inc., is a slim pocket-sized, durable, hand powered electric charger that produces a previously unmatched level of charging power when driven by the repeated pulling of a cord, in a way which somewhat resembles the action of a Yo-Yo.


  • Max power: 5 W typically (up to 6 W)
  • Electric output via built-in mini-USB
  • A LED indicator showing actual charging the electronic device being connected to.
  • YoGen: Pull cord to charge – [Link]

    15 Dec 2009



    dalewheat.com writes:

    Lux Spectralis is a deluxe RGB (red, green and blue) LED (light emitting diode) blinky that you can build. A small microcontroller (Atmel AVR ATtiny13) is preprogrammed with many different display modes that you can select with a pushbutton.

    Deluxe RBG LED Blinky – [Link]





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