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Power Management of Xilinx ZedBoard using MMPF0100

Posted January 7, 2016 by Chris

"This reference design is a power management of Xilinx ZedBoard using MMPF0100 Power Management Integrated Circuit (PMIC). A PMIC is an IC for managing power requirements of the host system and is commonly used in a system-on-chip (SoC) device."

Replacement LED driver for AN6877

Posted January 1, 2016 by Chris

"AN6877 is linear AF level meter IC produced by Panasonic and it is commonly found on many audio equipment. This chip is no longer manufactured by Panasonic and finding replacement chip for AN6877 is also quiet difficult."

Converting an ATX Power Supply Into a DC Bench Supply

Posted September 21, 2015 by Chris

"This article is the first in the ‘Projects’ category. It’s a very inexpensive way to make a pretty good DC bench supply or dedicated 12 volt supply for working on projects or powering devices. As of this writing, a good quality and powerful ATX PSU (power supply unit) can be obtained online for about $20.00 or less. "

YauDL – Yet Another Useless Dummy Load

Posted August 22, 2015 by Chris

"The concept is pretty simple. It is a constant current sink controlled by 2 opamps. Two paralleled logic level MOSFETs do the heavy lifting (heatsink!). Another pair of paralleled P-MOSFETs + a Zener diode act as reverse polarity protection. A capacitor is used to keep the first opamp from oscillating."

Critical guidelines for RF and microwave PCB Design

Posted August 9, 2015 by Chris

"Printed circuit boards (PCBs) now encompass much more than pure digital or mixed-signal technologies, and the PCB layout designer faces many more challenges when designing sub-assemblies with high frequency RF and microwave. The RF frequency range is typically from 500 MHz to 2 GHz, and designs above 100 MHz are considered RF. The microwave frequency range is anything above 2 GHz."

PS4 Controller Supported By The Arduino USB Host Library

Posted July 8, 2015 by Chris

"I am very pleased to announce that I have now added support for the PS4 controller via Bluetooth. This will allow you to read all the buttons and joysticks with the same API as all the other libraries I have written for the USB Host library."

Open-Source Quartz Crystal Microbalance

Posted February 25, 2015 by Chris

"OpenQCM is a highly sensitive microbalance with a wide range of applications in chemistry, biology and material science. The sensor is a surface sensitive quartz crystal capable of measuring phenomena at molecular scale. It works in vacuum, air and liquid environments. OpenQCM is an open hardware project with Arduino inside its heart. It’s a scientific as much as a friendly device very quick and easy to use."

Mini Portable Power Supply

Posted January 22, 2015 by Chris

"I did this project to make myself a portable power supply I could bring around to test certain broken equipment which requires fixing. It is handy to be able to bring around a variable power supply such as this than to look for a suitable battery to power it up."

Panda With A Gun On An LED Pixel Array

Posted December 9, 2014 by Chris

"Although the panda effect is in 3D, and 3D is usually hard, several visual limitations simplify the problem greatly. The panda is only seen from the side, and is rotated about its exact center. This means that if I can figure out how to render a side view of a single layer of panda voxels, I’ve come up with a solution for the whole effect."

Desk Lamp LEDs Retrofit w/ DIY Constant Current Driver

Posted June 2, 2014 by Chris

"Continuing my previous post about DIY constant current boost driver for 9 LEDs in series, here is a mod for my burned out desk lamp. I’ve designed new schematics with 4 mosfets in parallel, because this is only mosfets I had on hands and they are pretty low power with high Rdson. So I decided to use as many as I can."