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).
Tag Archive for 'Electronics'
More example programs for Octave has been posted in my wiki page. Please vist
If you don’t know about Octave, I have been maintaining a wiki page for Octave. See the link below
http://jeffrey.co.in/wiki/doku.php/experiments_using_octave_for_b-tech_course
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.
In a pursuit of fabricating pcb’s, I have won. I had designed pcb’s boards using PCB. But when I tried to fabricate the pcb in my home, I used to fail. the problem was with the Acrobat Reader . When I take the print out on the paper for layout transfer to the board, a size change occurs to the layout. This size change make the layout completely useless. Actually it was the wrong option selected in Acrobat Reader that made the size change.Now it is OK.
This is development board designed by me for the ATmega8 microcontroller. It is a miniature ARDUINO. You can burn your bootloader and then use with Arduino IDE or you can simply upload your hex file using DAPA programmer circuit. If anyone needs its schematic file please post an comment or I will soon upload it when I am free.
Anyway this is an open hardware project. I will try to upload the details soon. If you are in a hurry, please comment so that I can upload the details fast.
Here is the PCB layout files http://jeffrey.co.in/files/mini-AVR.pcb
These are the two snap shots of my board
PCB is one of the free softwares for designing PCB’s. But one of the major disadvantage is that, it lacks documentation. Here is a tutorial by DJ Delorie. This tutorial explains about designing a PCB using ordinary and SMD components. But still some parts are under construction. You can read the tutorial from this link
