A DIY dynamic electronic load by Jay_Diddy_B over at EEVblog Forum:
The dynamic load steps the load current so that the transient response of the power supply being tested can be observed.
0-5A maximum continuous current
0-5A pulsed current at 330Hz
DIY dynamic electronic load - [Link]
by Stephen Edward:
A Simple Breakout board for the edison. Does nothing special except breaks out the 70pin connector to 2.54mm Pins so you can start experimenting with the Edison.
Has an experimenters area so you can solder on things like a regulator or Level shifter.
It also has the bottom side through connectors so that you can daisy change multiple boards or other Edison shields
Custom DIY Intel Edison Breakout Board - [Link]
by batkin @ instructables.com:
Get in the mood with some fairly simple ATTiny85 based DIY color shifting lamps!
Color Changing Mood Lamp - [Link]
by Suzanne Deffree:
The holiday season is in full swing and you may still have a few people to check off your gift-giving list. If you’re at a loss for what to buy the open-source-focused engineer or maker in your life, take a gander at these 8 open-source gifts.
In this list you’ll find out-of-the-box devices, kits, and components for DIY designing, some starting as low as $19.99, with others topping $2100. Be sure to share your own open-source favorites in the comments section and let us know what you think of the ones we’ve included on this list.
8 open-source holiday gifts - [Link]
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]
by Morgana Matus:
Since the first wheels of mass production started turning during the Industrial Revolution, fine craftsmen and DIYers have found it more difficult to sustain their crafts. Until recently, those handmade-focused entrepreneurs who wanted or needed access to the latest technology would have to assemble a large amount of capital for items such as 3D printers or CNC machines. Those who couldn’t afford the high overhead were left to envy those wares and hope for a price decrease.
Makerspaces: A Revolution in Sustainable Production - [Link]
by Giovanni Militano @ diyaudioprojects.com:
I’ve always enjoyed electronic kits of all kind and like many of you will credit them for the foray into DIY audio. Over time as my DIY skills matured I found myself taking the DIY route for projects far more often than relying on kits. While I will always enjoy electronic kits, I generally won’t try one out unless there is something really unique about the kit. When I saw the Gobo Stereo Audio Amplifier kit from boxedkitamps.com, I was immediately intrigued by the unique looking enclosures available with the amplifier kits. Shown in Photograph 1 below is the completed Gobo Stereo Audio Amplifier kit with a translucent blue acrylic enclosure. The choice of enclosure finishes for the Gobo stereo amplifier kit include blue, dark grey and orange acrylic and bamboo.
Gobo Stereo Audio Amplifier Kit (LM1875, 15W, Class-AB) - [Link]
Pulse oximetry is a non-invasive method for monitoring if a patient’s oxygenation is unstable and Arduino user die_Diode sent us his version of a DIY Pulsoximter developed with two Arduino:
Arduino Mega for the oximetry electronics and Arduino Uno for the graph. The electronics includes LED Driver, Photo current transformation, patient-dependent calibration LED, Active filters, Nellcor SpO2 sensor. Adafruit OLED displays Vitalparamter. Noritake VFD display GUU-100 shows the PPG. The boards are connected to the electronics with a Protoshield.
DIY Pulsoximeter developed with two Arduino - [Link]
Making your own PCB boards for DIY electronics projects is not difficult. Doing so as a DIY project is extremely handy and allows almost anyone to custom design one-off, or small batch circuit layouts relatively quickly and cheaply, without the need for the volumes or costs involved in using the services of professional circuit board manufacturers. With care, DIY PCB project results are usually of extremely high quality and are very satisfying. Even more interest can be added to projects when printed circuit boards are combined with CNC cutter designs for shaping of the circuit boards.
There are various different methods for making PCB boards. Each method has various pros and cons, with most considerations being linked to cost, quality of finished product, accuracy required for fine circuits and availability of chemicals and materials.
DIY Etching of Printed Circuit Boards (PCB) - [Link]
Applied Science @ youtube.com writes:
I built a microbalance based on a design by Paul Grohe: http://www.youtube.com/watch?v=n90whRO-ypE
It is has a precision of about 5 micrograms, and I measured a single eyelash at about 35 micrograms. The balance is built from an analog panel meter that is controlled by a servo loop which optically monitors the meter’s position. Adding mass to the meter’s needle requires that the servo loop add more current to maintain the needle’s position. This additional current is read, and converted to a mass value.
Measure the mass of an eyelash with a DIY microbalance - [Link]