A class-D amplifier or switching amplifier is an electronic amplifierin which the amplifying devices (transistors, usually MOSFETs) operate as electronic switches, and not as linear gain devices as in other amplifiers. They are rapidly switching back and forth between the supply rails, being fed by a modulator using pulse width, pulse density, or related techniques to encode the audio input into … Continue reading Class-D amplifier
Internet of Things
How to stop and restart an X server on Ubuntu
Make sure you are logged out first. Hit Ctrl+Alt+F1 and login using your credentials. kill your current X server session by typing sudo service lightdm stop or sudo lightdm stop Enter runlevel 3 by typing sudo init 3 Do whatever you need to do You might be required to reboot when the installation finishes. If … Continue reading How to stop and restart an X server on Ubuntu
How to stop and restart an X server on Ubuntu
Make sure you are logged out first Hit Ctrl+Alt+F1 and login using your credentials. kill your current X server session by typing sudo service lightdm stop or sudo lightdm stop Enter runlevel 3 by typing sudo init 3 Do whatever you need to do in the terminal You might be required to reboot when the … Continue reading How to stop and restart an X server on Ubuntu
Frozen connection using ssh over Amazon EC2 using Ubuntu
Question: When I am connected to Amazon EC2 using the secure shell and don't type anything for a few minutes, everything freezes. I can't type anything or exit. After a few minutes I get a message from the server... Last login: Fri Dec 6 23:21:28 2013 from pool-173-52-249-158.nycmny.east.verizon.net ubuntu@ip-172-31-31-33:~$ Write failed: Broken pipe Some of … Continue reading Frozen connection using ssh over Amazon EC2 using Ubuntu
Jawbone’s demise heralds the end of the wearables industry
Personal note: The decline of this type of wearables started two years ago when the market was flooded with them and it's no longer "cool" to have one. Most people stop using it after a few months. Just think - who wants to check the heart rate so many times a day? We acknowledge the … Continue reading Jawbone’s demise heralds the end of the wearables industry
Micro:bit Small-board Computer Launches in U.S. & Canada to Inspire Next Generation of Students
The Micro:bit Foundation aims to put the device into the hands of 2 million children in the U.S. & Canada by 2020 The Micro:bit Educational Foundation announced today the micro:bit is now available to schools, clubs and families across the U.S. and Canada. The micro:bit is a credit card-sized, programmable device designed to teach the … Continue reading Micro:bit Small-board Computer Launches in U.S. & Canada to Inspire Next Generation of Students
Amazon Greengrass launches as a snap on Ubuntu
https://youtu.be/1rLxPOxVJoQ Personal note: Take a look at Ubuntu Core with Qt for Internet of Things development (6/25/2017) Last week, Amazon launched Greengrass, their new IoT platform allowing developers to create intelligent edge software. Amazon is collaborating with a variety of manufacturers to make Greengrass available on as many devices as possible from home gateways, industrial gateways … Continue reading Amazon Greengrass launches as a snap on Ubuntu
Where is Java used in Real World?
If you are a beginner and just started learning Java, you might be thinking where exactly Java is used? You don't see many games written in Java except Minecraft, desktop tools like Adobe Acrobat, Microsoft Office are not written in Java, neither is your operating systems like Linux or Windows, so where exactly people use … Continue reading Where is Java used in Real World?
Cron Jobs and Rails
Cron If you’re reading this article, it’s probably because you’ve heard of cron jobs, cron tasks, or crontab. Cron is a piece of software written for *nix-type operating systems to help with the scheduling of recurring tasks. You may want to use cron to schedule certain recurring actions in your Rails application, such as checking … Continue reading Cron Jobs and Rails
Linux Cron
Cron allows Linux and Unix users to run commands or scripts at a given date and time. You can schedule scripts to be executed periodically. Cron is one of the most useful tool in a Linux or UNIX like operating systems. It is usually used for sysadmin jobs such as backups or cleaning /tmp/ directories … Continue reading Linux Cron
Eric's playground 