ajoyraman posted a tutorial on how to make a DIY USB-matchbox oscilloscope, an instructable here:
In order to economize on the cost of an enclosure while still providing an aesthetic unit the Aj_Scope2 is enclosed in a large size cardboard matchbox enclosure.
The USB connection to the PC is on one end while the Audio-Jack for the signals to be monitored is on the other.
A ‘Busy’ LED is provided on one corner at the top and a ‘Reset’ switch is provided diagonally opposite.
The ‘Reset’ switch provides a restart of the micro-controller is the worst-case of hang-up. This typically occurs when the operator selects a trigger threshold which is out of limits with respect to the waveform being observed. If the Aj_Scope2 is operated correctly this switch is seldom used.
DIY USB-Oscilloscope in a matchbox - [Link]
Turn your toaster oven into your own solder reflow factory shop using the Reflow Master Shield!!!
The Reflow Master Shield from Paladin Enabling Technologies is an Arduino shield that turns your normal toaster oven into a reflow oven. A reflow oven is used in the production of electronics to change solder paste from a paste form to a liquid form and lastly to a solid form. This results in all your components being soldered for you in one run.
But let me share with you why I’ve created the Reflow Master Shield and why you would want one.
Reflow Master Shield – Arduino Solder Reflow Oven - [Link]
Compressed gas for cleaning – Dust cleaner, brings huge savings for the price of small limitations.
The name of this article might also be like „Dust Off or Dust Cleaner? Both are the sprays – compressed air for dust removal. Dust Off is a well known, long-term well-proven spray for cleaning from dust and other loose dry particles. Dust Off provides absolute safety in a form of non-flammability. However, this indisputable plus is also reflected in a price.That´s why we bring you also a cheaper alternative – spray Dust Cleaner, which provides practically the same service like Dust Off, but for approximately only a 1/3 price. Even though compressed (liquefied) gas Dust Cleaner is flammable, but it represents much cheaper solution for all cases, when there´s no risk of ignition. for example when we work with a switched-off device, which isn´t hot at the same time and there´s no source of sparks near. That´s why it´s suitable for example for cleaning of:
- plated copper boards (disconnected from a power supply)
- micro-assemblies, servo-motors etc.
- optics, lenses and precision mechanics
- PC and other communication devices
- fans and heatsinks
- fiberglass cables connections
Similarly like Dust Off, even the Dust Cleaner produces a strong air jet, which is in majority of cases strong enough to remove various dry contaminants. It finds its place everywhere, where other cleaning methods (for example with liquids) are not suitable, or they might leave various residues. Detailed information can be found in the Dust Cleaner and also Dust Off datasheets.
Dust Cleaner will blow away dust for a 1/3 price - [Link]
by Darren Quick @ gizmag.com:
Researchers from Columbia University and the Georgia Institute of Technology are laying claim to having observed piezoelectricity in an atomically thin material for the first time. The effect was demonstrated in the world’s thinnest electric generator made from a two-dimensional molybdenum disulfide (MoS2) material, which had previously been predicted to exhibit such properties.
Two-dimensional piezoelectric material forms basis of world’s thinnest electric generator - [Link]
Recent advances of Li-Ion battery technology could be the kick start the faltering electric vehicle market needs for it to go main stream. As well as the fast charge time the new battery can be cycled more than 10,000 times and has a lifespan of 20 years.
The work carried out at NTU Singapore replaces the traditional graphite anode with one made from titanium dioxide, an abundant, cheap and safe material found in soil. It is commonly used as a food additive and in sunscreen lotions. Before the material can be used it is converted into fine nanotubes which allows faster chemical reactions in the cell giving it super fast recharge times.
Li-Ion battery recharges to 70% in 2 mins - [Link]
If Arduino is your development platform of choice the tiny self-contained MicroLink board offers some interesting features. At just 50 x 32 mm it contains an ATmega328, an SIM800H quad band GSM module and on-board USB and battery charging capabilities. It has all the peripherals necessary to allow wireless remote control and monitoring and can use any standard 3.7 V LiPo battery for power which is charged when the USB port is connected. The charge state can be checked at any time from a remote location.
The Arduino compatible MicroLink - [Link]
Baoshi of DigitalMe wrote an article detailing his minimalism ATTiny2313 development board build:
The AVR chip I’m talking about is Atmel ATTiny2313, in SOIC-20 package. To make the development board, I bought some 28 pin SOIC/SSOP to DIP adapters. These adaptors usually come in double sided design. Corresponding pins on both sides are connected via the plated through holes at edges.
I made a 2×3 AVR programming header by pulling off pins (longer ones) from a double-row right angle pin header and reinsert them into the plastic base. A needle nose pliers is very handy for this purpose.
Minimalism AVR development board - [Link]
by Lee Goldberg @ edn.com:
The CircuitMaker PCB design tool could be thought of as the electronics enthusiast’s equivalent of Picassa, the free alternative to Photoshop – except that it’s a got a much more refined interface which makes it easy use. The program’s 3D modeling capabilities (more about that later) and other advanced features will help designers deal better with the “lumpy” nature of LED lighting products, or any other design project which involves large, irregular components. But that’s only half of the story. The software’s creators have also taken an interesting approach to solving several important technical and economic issues which have arisen with the Maker Economy by borrowing a few lessons from the movement’s own playbook.
Free PCB design tool includes 3D modeling, crowd-sourced parts database - [Link]
We are building another enjoyable weekend DIY project. This is an audio power amplifier based on LM1876 which can deliver up to 20W per channel into 4 or 8 ohm load and guarantees less than 0.1% THD + N (Total Harmonic Distortion + Noise).
The amplifier is powered by -15 0 15 VAC symmetrical supply. The full bridge diode rectifier and the smoothing capacitors convert the AC input to ±21 VDC which is used to power LM1876. The inductors on the AC input line reduces the noise arising from the mains line.
DIY LM1876 Dual 20W Audio Power Amplifier - [Link]
by Darren Quick @ gizmag.com:
There have been numerous cases of lithium-ion batteries catching fire in everything from mobile phones and laptops to cars and airplanes. While the odds of this occurring are low, the fact that hundreds of millions of lithium-ion batteries are produced and sold every year means the risk is still very real. Researchers at Stanford University have now developed a “smart” lithium-ion battery that would provide users with a warning if it is overheating and likely to burst into flames.
“Smart” lithium-ion battery would warn users if it is going to ignite - [Link]