Gege built an ATX Breakout board free PCB. The ATX breakout board routes the -12, 3.3, 5 and 12 volt ATX outputs to screw terminals, each protected by a 1.25 amp resettable polyfuse. If you build a free PCB we’ll send you another one! Blog about it, post a picture on Flicker, whatever – we’ll […]
Author Archives: DP
TS3300 switching regulator coupled with an LDO in same package
Steve Taranovich has posted this review of the TS3300 switching regulator coupled with an LDO in same package: Touchstone, with its first analog power management product, has enhanced such a function with the capability to use supply voltages down to 0.6V while still being able to deliver a 75 mA output current. The device […]
Control microbes with your mind
Here’s a video by Geva describing how to control microbes with your mind: Paramecia will change their swimming direction in response to an electrical field. With an Ardunio, a hacked brain sensor and a little code you can control your own army of single celled minions with mind power alone. Full build instructions and source […]
ATTINY2313 Thermometer width DS18S20
Thermometer width DS18S20: In my new Dacia Duster is missing unfortunately an outside temperature indication. A finished thermometer with LCD did not separate from there while the contrast with sunlight usually particularly is. I had still alphanummeric LED display in red there for this project in the best way am suitable. As microcontroller i used […]
Bus Pirate Arduino Shield free PCB build
Mikelelere built a Bus Pirate Arduino Shield from a free PCB. This board gives the Arduino the same front-end circuity as the Bus Pirate. I have assembled the Bus Pirate Shield white PCB I received recently. As shown in the photo, I had to do some greenwiring to solder a SOIC 8 EEPROM instead of the […]
Why you should document your Open Source Hardware project
Why you should document your Open Source Hardware project: This specific moment, that moment when you start working on the refinements of a product to create the second version, could be a great moment to document your invention. In fact, when you start again the production process, you already know how to do things, and […]
400kHz function generator with ICL8038
Manekinen posted an article describing how he designed and built his 400KHz function generator based on ICL8038: Function generator with adjustable frequency from 0 Hz to over 400 kHz, adjustable amplitude, DC offset, duty, and of course the function selection – square, triangle, and sine. Generator based on good old ICL8038 integrated chip generator that […]
Indoor Environmental Quality station +Bluetooth +Thingspeak
Want to test the Indoor Environmental Quality in your home or office. Here’s an Instructable by Donmatito on how to build your own. Indoor Environmental Quality (IEQ) is the measure of comfort and includes factors such as temperature, humidity, pressure, noise level, and indoor air quality. Don’s original goal was to monitor the IEQ of his […]
Tommy Rev0 is complete!
Parker Dillmann of Longhorn Engineer reports he’s just finished the Rev0 of the Tommy Pinball System: Just finished Rev0 of the Tommy Pinball System. I will be uploading the Eagle files after I can confirm the board works. It is a 4-Layer board so I will be using Seeedstudios new 4-layer prototyping service to order […]
AD75019 crosspoint analog switch
Paul over at Dorkbotpdx has written an article about his AD75019 crosspoint analog switch: The chip is controlled by a big 256 bit shift register. I just chained the 3 chips in tandem, so the shift register is 768 bits. In the regression tester, I used 3 of these chips to allow any combination of […]
Using a solder paste dispenser with compressed air tanks
Nickjohnson from Arachnid Labs shares that he successfully hooked up his solder paste dispenser to a CO2 tank!” One thing that’s dissuaded me from buying a solder paste dispenser for so long is that I’m really not keen on a loud and bulky compressor in my workshop area, and I don’t want to spend several […]
#FreePCB via Twitter to 2 random RTs
Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]
DIY Metcal 13.56 MHz RF supply
Chris over at the EEVblog forum designed and built this DIY Metcal 13.56 MHz RF supply: A while ago i came up with my own circuit for that, plus some nifty firmware (which basically is optional). You can see what i have done so far on the EEV-Blog forum here As of recently the whole thing is […]
quietPower, a low noise switch mode power supply
Brian from teho Labs has been working on creating a power supply – the quietPower: quietPower is a power supply under development at teho Labs to provide a low noise bipolar output. This is essential for creating high quality measurement systems. quietPower is still under development, when it is finished full schematic and a parts list […]
USBTiny-MkII SLIM programmer
Here’s a USBTiny-MkII SLIM programmer based on AT90USB162 microcontroller: USBTiny-MkII SLIM programmer (AVRISP-MKII clone) supports all Attiny, Atmega, and Xmega µcontrollers. It has three programming interfaces: ISP, PDI, and TPI. It works with AvrStudio or AvrDude. Small convenient board, contains double direction voltage translator for all interfaces and working from 1,2V, jumper for target chip […]
Another laser cut case for the Logic Sniffer
Here’s another cool laser cut acrylic case for the Logic Sniffer: Case is made from 4 layers of 3mm laser cut black acrylic. All text is engraved and filled with white paint. Buttons are cut from the same material, and they are mounted with double sided tape to the top cover (each button is actually […]
“Madparts” functional footprint editor update
Andete posted an update to his “madparts” functional footprint editor we covered previously: Today I released 1.1. Mostly a bug-fix release but it does contain a hugely simplified installation for Win32 and Linux. Via the forum.
App note: Various audio amplifier classes
Here is a design guide from Maxim describing various classes of audio amplifiers. This has been a brief survey of the many types of audio amplifiers commonly used in designs today. Clearly, when designing an audio circuit for any type of device, care should be taken in determining the audio amplifier topology best suited to […]
Free PCB Sunday: Pick your PCB
We go through a lot of prototype PCBs, and end up with lots of extras that we’ll never use. Every Sunday we give away a few PCBs from one of our past or future projects, or a related prototype. Our PCBs are made through Seeed Studio’s Fusion board service. This week two random commenters will […]
App note: CMOS current source
Here’s a video describing CMOS current sources. CMOS current source circuits are examined. The voltage versus current and layout are presented. The channel region versus the voltage/current curve is explained. The equation to calculate the Gate-Source voltage is given. The CMOS cascode current source is also explored.