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EE Tips
Find and Eliminate Ground Loops
By George Novacek
A ground loop is an annoyance that can cause noise and interference in your electronic systems. George Novavek explains the cause of ground loop interference and provides tips for finding and eliminating ground loops in analog AV systems. In Circuit Cellar 301 he writes:
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| | The cause of the ground loop interference |
Everything had been fine with my home entertainment center-comprising a TV, surround-sound amplifier, an AM/FM tuner, a ROKU, and a CD/DVD/BlueRay player-until I connected my desktop PC, which stores many of my music and video files on one of its hard drives. With the PC connected, the speakers put out a low level, annoying, 60-Hz hum-a clear indication of a ground loop. All my audio and video (AV) devices are fairly new, quality, brand-name products equipped with two-prong power cords, so even though the PC has a three-prong plug, there should not be multiple signal returns causing the ground loop. This article describes an approach to eliminating ground loops in analog AV systems. Read the Entire Article
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FORMULA ALLCODE KICKSTARTER CAMPAIGN
Sponsored by Matrix TSL
Matrix TSL has launched a Kickstarter campaign for its Formula AllCode robotics course, which features a high-specification, Bluetooth-enabled robot. Formula AllCode is a platform for both novice or advanced electronics enthusiasts to learn and test their robotics skills. You can program the robot via Python, AppBuilder, Flowcode, Matlab, LabVIEW, C, and more. It is compatible with Raspberry Pi, Android, iPhone, and Windows devices.
The funds raised from this Kickstarter project will allow Matrix to take the current prototype development shown in the project videos to the next level with a technical specification to beat any other like-for-like robot buggy and subsequent manufacture of 1000 units to be launched world-wide.
By backing the Kickstarter campaign, you are supporting a project which allows users to develop their robotics understanding on a platform of their choice. Whether your starting out with your first robotics project or you're a fully fledged robotics developer, the Formula AllCode will work for you. The project must be funded by Sunday, September 6, 2015.
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ELECTRICAL ENGINEERING CHALLENGE
Sponsored by NetBurner, Administered by Circuit Cellar
Spot the schematic error for a chance to win! Put your technical skills to test. The August Electrical Engineering Challenge (sponsored by NetBurner) is now live.
THE CHALLENGE
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Find the error in this schematic and submit your answer via the online Submission Form
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Find the error in the nearby schematic, which is also provided on the EE Challenge webpage. Submit your answer via the online submission form by the deadline of August 20, 2015 (2 PM EST).
PRIZES
Circuit Cellar will randomly select 2 prize winners from the pool of respondents who submit the correct answer. One person will receive a NetBurner MOD54415 LC Development Kit ($129 value). A second person will receive a Circuit Cellar Digital Subscription (1 year).
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Circuit Cellar #301
August 2015
Simple Embedded Serial Communications | Recording .3GPP Files | Image Processing for Security | Wearable Tech Innovation | Ground Loops 101 | PSoC Programmable Logic | Embedded Wireless Systems | Vintage Electronic Calculators | Laser Sensor Exploration | Custom Peripheral Cores for Digital Sensor Interfaces | And More
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