Archive for the 'Circuit' Category

Electronic Design and Fabrication with gEDA

Published
by
admin
on December 5, 2009
in Circuit, Electronics, GNU/Linux and open hardware
. 1 Comment

“Electronic Design and Fabrication with gEDA” is my first article in LINUX For You Magazine.

This is the first time I am forgetting to blog about my article. Actually it was published in last month(NOVEMBER 2009) issue. Please read it if possible.

This article mainly gives a quick introduction about gEDA. I have also given some snaps of my designs.

http://jeffrey.co.in/articles_talks.html

Robotic Pumpkin

Published
by
admin
on October 9, 2009
in Circuit, Electronics, hacks and open hardware
. 0 Comments

See this cool open source project from Evil Mad Scientist

Make a Robotic Snap-O-Lantern!

Current Sinking & Current Sourcing Tutorials

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by
admin
on October 4, 2009
in Circuit, Electronics and tutorials
. 0 Comments

I have seen some web pages defining that current sinking and current sourcing are same. But the truth is that they are different. This is a tutorial about current sinking and current sourcing in Integrated Circuits(IC).

Current Sinking & Current Sourcing Tutorials

AT90USB162 Mini Development Board

Published
by
admin
on September 6, 2009
in Circuit, Electronics, Embedded Linux, GNU/Linux, Hacking and open hardware
. 1 Comment

This time I am with an AVR USB board. It is an tiny development board for the AT90USB162 chips.  I have actually made this board design for my friend’s main project. The design has been made using gEDA. It’s an complete open hardware project. But still the schematics are missing.

Actually I have started drawing the board layout using pcb directly instead of using gsch2pcb. I will try to upload the schematic of the board soon as possible.

Special thanks to Sreeraj and Pramode Sir. This project was completed 3 months before. But I didn’t have much time for blogging. Sorry for the late post.

Here are some of the reference links
ATMEL AVR USB AT90USB162 MICROCONTROLLER PROTOTYPE DEVELOPMENT BOARD
AVRopendousDIP - avropendous - Open Hardware Development Board for the AT90USB162

Here is the board layout file.
sree-usb-noicsp.pcb

Here are some snapshots.

USB MP3 Player

Published
by
admin
on August 9, 2009
in Circuit and Electronics
. 87 Comments

Last day I bought a USB MP3 player board from a local store in Thrissur. This board can read MP3 files from a USB thumb drive and play it for you.

The board circuit diagram is so simple that there are a very few connections. some of the connections are

  • IR sensor connection (3 wires - IR data, VCC, GND)
  • USB socket connection (4 wires - VCC, D-, D+, GND)
  • Power supply 5V (2 wires - VCC, GND)
  • Audio Out (3 wires - Left, Right, GND)
  • Switch (4 wires - Next, Previous, Play, Mode)

The other main features are an built in FM receiver and also an remote control. The player can read up to 1999 songs. I have not tried any other music formats other than MP3.

The main attraction is its cost. The board cost only 250 Rupees ( 5$).

If anyone needs the connection diagram of the board please do contact me :)

Here are some screen shots

Note(Nov 28, 2009): This is not an open hardware project. Please don’t ask for circuit diagram. I actually bought this circuit board from a local store. The connection details are so easy. The board has markings on it for the connections.