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]
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]
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]
Building a high-power LED light with adjustable color temperature.
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]
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]
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]
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]
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]
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.
YoGen: Pull cord to charge - [Link]
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]