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DIY thermoelectric device charges hiker's smartphone
(Phys.org) —Whether you're in a city café hunting down a spare outlet or camping and worrying about losing outside contact, the problem is the same, a smartphone about to lose power just when you need it the most. What to do? A problem-solver who is into hiking and backpacking has an answer. He shows, step to step, how to construct a portable thermoelectric emergency generator. David Johansson, who used the project-sharing site Instructables for his step by step instructions, explained how he arrived at the idea, construction, and results. Spending several days hiking in the wild at times, he would rely on his smartphone with GPS, along with spare batteries and solar chargers.
In Sweden they are building high quality multifamily wood prefabs that we can only dream about here
There are a few things we obsess about on TreeHugger, including modular prefabrication, tall wood construction and digital design. One doesn’t usually find them all in one place in North America, but in Sweden, it’s almost the standard. Lindbäcks, a 90 year old company in northern Sweden, is truly taking modular construction to new heights, cranking out apartments, condos, student housing and seniors buildings a rate of twenty units per week.
WB2VSJ HP-23 Rebuild Page
At least the bottom looks a bit cleaner. The 100K bleeder resistors all were way out of spec. They measured:
Hacked Gadgets – DIY Tech Blog
deba168 from India designed and built this Arduino Solar Charge Controller to provide electrical power in areas where the grid can’t always provide power when needed. Code and schematics are provided so you can get some inspiration from the design. ”At first the charge controller will check the solar panel voltage and compare it with battery voltage ,If it is greater then the Arduino will starts sending pulse width modulation(PWM) signals to the mosfet(Q1) in order to charge the battery .When the solar panel voltage was below the battery voltage ,this pwm signals will not send by Arduino . Then next the micro controller will check the battery voltage ,if the battery voltage was below 6.96 v volts then the battery will be charged in boost mode ,that mean the battery will be charged with maximum amperage ,this boost mode of charging will be done by sending pulse width modulation signals with 95% duty cycle .
Solar Tracker in the Internet Cloud - do it yourself
Show All 12 Items This is a Solar Tracker. A full size, internet cloud connected, smartphone accessible Solar Tracker built mainly from 2x4s and plywood, employing wooden peg gears, recycled curtain poles, nuts, bolts and threaded rod. The solar tracker uses a home built electronic controller incorporating WiFi, stepper motor drives, accelerometer and magnetometer. The tracker was designed to drive a full size 90W panel in azimuth and elevation.
W4JBM's Thoughts on Test Gear
Every couple of months I hear from someone who asks what they need to buy to get started repairing their radios or tinkering with projects. I've answered the question enough times that I decided I'd pull together my thoughts here for anyone who's interested. It's important to understand that one size doesn't fit all.
Float charging lithium ion cells
Apart from making better door stops, what advantage do lead-acid batteries have over lithium ion (Li-ion) batteries? The answer is that they are easier to charge. Apply 13.8V to any nominally 12V lead-acid battery and it will take just the current needed to keep itself in tip top condition, and it will be ready to deliver its full capacity instantly. Applying a constant potential is called ‘float charging’ and lead-acid batteries are almost perfectly suited to it. While more expensive per Watt-hour, lithium-ion cells are far lighter, smaller and contain fewer toxic chemicals than most other commonly available battery types.
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Feedback always welcomed... Please keep gotwind informed of your hard work, it helps us all. You can send pictures and ideas either by email or via theforum Scotland's Peter Davie emailed: I built one of these dynohub generators. This has withstood winds in excess of 70MPH perhaps even more. I have never serviced it at all,
Amateur Radio Kit Roundup – Updated 2/18/2013
The Splinter – from Breadboard Radio Kit building appears to be on the rise again. With so many people talking about it lately I attempted to research sources for kits, only to find out that there wasn’t a single-source for Ham Radio kit suppliers.
Stepper Motor Voltage Doubler Circuit - General
Double the voltage from a stepper motor using two bridge rectifiers home > general | electric circuit | educationA stepper motor can be used in conjuction with PVC rotor blades to make a very cheap DIY wind turbine generator. Stepper motors can be bought new quite cheaply, but they can also be salvaged out of old printers, floppy disk drives, and other sources. Learn more about stepper motors and find out how to identify their wiring reading our articles stepper motor basics, and in particular Examining a Stepper Motor.On the side of most stepper motors is printed the rated voltage and the current per phase. Voltage Doubler Circuits and Wind Turbines
