Hacked Gadgets Forum

November 5, 2014

How Vacuum Tubes Work and How they are Made

at 1:51 pm. Filed under Educational

 

With the reliability of modern electronics vacuum tube making is a dying art. Here are some great videos demonstrating the laborious steps that go into creating them.

“Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. This type is called a thermionic tube or thermionic valve. A phototube, however, achieves electron emission through the photoelectric effect. Not all electron tubes contain vacuum: gas-filled tubes are devices that rely on the properties of a discharge through an ionized gas.”

 

 

 

 


October 18, 2014

Fast Charging Batteries that last 20 Years?

at 8:44 am. Filed under Educational, Insane Equipment

 Fast Charging Batteries that last 20 Years

 

Apple is famous for making nice looking products that are practically sealed for life even though many of us consider the internal battery a serviceable part. Having to access batteries for occasional replacement might be a thing of the past. Also planning to charge items is currently something that revolves around many things, you probably plan to charge your phone while you sleep, your electric car gets topped up when you are at work, you have a few sets of batteries for your cordless power tools. Wouldn’t it be nice it charging took a few minutes instead of many hours? How about a battery that lasts 20 years, which is typically more than the entire usable life of the device? This might not be science fiction for much longer. Scientists at Nanyang Technology University have developed fast charging batteries that can be recharged up to 70 per cent in only two minutes!

Thanks for the tip John.

“In the new NTU-developed battery, the traditional graphite used for the anode (negative pole) in lithium-ion batteries is replaced with a new gel material made from titanium dioxide.

Titanium dioxide is an abundant, cheap and safe material found in soil. It is commonly used as a food additive or in sunscreen lotions to absorb harmful ultraviolet rays.

Naturally found in spherical shape, the NTU team has found a way to transform the titanium dioxide into tiny nanotubes, which is a thousand times thinner than the diameter of a human hair. This speeds up the chemical reactions taking place in the new battery, allowing for superfast charging.”

 

Fast Charging Batteries that last 20 Years_2


October 5, 2014

Making of an Arduino

at 7:10 pm. Filed under Educational

Making of an Arduino

 

This video by designboom gives us a glimpse into the making of an Arduino PCB. Arduino boards are still produced in Italy! You can see an interesting picture (last one at the bottom) which shows an arduino in a programming and test fixture. I am quite surprised to see that they are programmed individually, I would have though there might have been either a large program and test system which would have done a panel at a time or an automated line where they were just fed in one end and came out the other end with a pass or fail indication.

“who would ever imagine that global cultural and economic revolution would spring from the tranquil fields of piedmont, italy, in tiny towns nestled against the stunning backdrop of the alps? but that’s exactly where arduino, the system of microcontrollers revolutionzing the maker movement and pioneering the concept of opensource hardware, was born in 2005 and continues to make its home today.”

 

 

Making of an Arduino_2

 

Making of an Arduino_3

 


September 8, 2014

How Ferrite Beads Work – EMI Suppression

at 8:40 pm. Filed under Educational

How Ferrite Beads Work - EMI Suppression_4

 

If you are working on a project where you want to get rid of EMI from entering an input you might want to look into using some ferrite beads, they can help you out in removing high frequency noise from your circuit. The ferrite looks like a variable resistor that has no impact on your circuit at low infrequence and starts to conduct to short out higher frequencies. It does this by converting the energy that is suppressed into heat.

“Ferrite beads prevent interference in two directions: from a device or to a device. A conductive cable acts as an antenna if the device produces radio frequency energy, this can be transmitted through the cable, which acts as an unintentional radiator. In this case the bead is required for regulatory compliance, to reduce EMI. Conversely, if there are other sources of EMI, such as household appliances, the bead prevents the cable from acting as an antenna and receiving interference from these other devices. This is particularly common on data cables and on medical equipment.”

 

 

 

September 4, 2014

HLK-RM04 Serial to WiFi Module

at 10:45 pm. Filed under Educational, Electronic Hacks

HLK-RM04 Serial to WiFi Module

 

If you are looking to add some WiFi connectivity to your next project the HLK-RM04 Serial to WiFi Module might be just the thing if you want to go wireless. The $10 HLK-RM04  module handles all of the WiFi overhead so your microcontroller project can simply send serial data to it using the TX and RX pins. RAYSHOBBY.NET has a great tutorial including code to get you started with this module.

Via: Dangerous Prototypes

“The chip (RT5350F) is a 360MHz MIPS core with built-in WiFi support. The module is quite powerful — at factory default settings it functions as a normal WiFi router. Now, in order to get it to talk to a microcontroller like Arduino, I need to use its Serial-to-WiFi capability. What is that? Well it means using the serial (TX/RX) interface to send and receive Ethernet buffers, and similarly using serial to send commands to the module and query or change its current status. This is quite convenient because first, it only takes two wires (TX/RX) of the microcontroller to talk to the module, second, it moves WiFI-related tasks to the module allowing the Arduino code to be very much light-weighted. “


 


July 28, 2014

Portable Device for Measuring Hydration and Body Fat

at 9:38 am. Filed under Cool Gadgets, DIY Hacks, Educational, Electronic Hacks

 

 

Cornell ECE 5030 students Uma Mohan, Sarvesh Sukhatme and Priyanka Venkatesh have designed a Portable Device for Measuring Hydration and Body Fat. The project passes a small current through the body to measure the amount of hydration in the person. A 940 nm LED is used to detect the amount of fat the person has by shining it through a part of the body, the amount of light that passes through allows them to calculate the body fat of the person.

“We used a LM358 Opamp to make a voltage dependent constant current source. Setting the resistor connected to pin2 as 200 ohms sets the current as the (voltage magnitude/200) A.  The voltage source used was a square wave with magnitude 0.2V and frequency 2Hz.”

 

June 26, 2014

Learn FPGA And CPLD

at 11:30 pm. Filed under Educational

 

Pyroelectro has just started a course to teach you how to use FPGA and CPLD devices. If you are currently using microcontrollers this course will give you the skills to move to the next level. There are 10 lessons in the course which will start you at hello world and quickly progress into some very usable topics. The video above is from the first of 10 course videos, the other 9 courses will be released one per week.

If FPGA and CPLD devices are a bit over you head you can start with basic electronics and digital electronics first.

Thanks for the tip Chris.

“Here’s a short overview of the course:

This course is meant to create a pathway into learning about FPGA and CPLD electronics, for people who are scared of the code, tools and general trickery that usually comes with it. A hands-on approach is taken in this course through a combination of lecture and experimentation to teach you about the different features of both the development tools and languages used in the world of FPGA.

Additionally, visuals are used throughout lectures like step-by-step schematic building and line-by-line code explanations so that everything gets explained.

Signups @ Ureddit: http://ureddit.com/class/106959/ Course Page: http://www.pyroelectro.com/edu/fpga/

 

 

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