About Circuit Exchange International (CXI)
This site is Circuit Exchange International, a free, non-profit home page about electronics. Created in March 1999, this site holds 286 schematics in 10 categories. Also included are design, simulation and practical sections. If you ever type Circuit Exchange International, then you'll realize why I abbreviate it to CXI.

From Azerbaijan to Zimbabwe, from Antarctica to Australia there have been visitors from all 6 continents and 220 Countries. Although largely a single effort, I do welcome contributions to this site. Made entirely on linux with Bluefish Editor and Gimp.

My site is currently undergoing a rework and is now using CSS style sheets. My site uses many PNG images and may not display properly on older browsers like Internet Explorer 6 and below. It is ok with IE7 and higher although some CSS features (rounded corners) are not supported by Microsoft. I recommend using Firefox, Google Chrome, Opera or Safari if you have problems.

Email Me
To combat spam I am now using a yahoo email address. This is shown below and is an image, not text. You need to type this into your email client to contact me.
For verification the image reads: hal eight zero zero zero b at yahoo dot com.

Contributions
You are welcome to contribute a circuit or article to Circuit Exchange. Diagrams are best preserved in either .png or .gif format, images in .jpg format. I can accept most document formats, but its probably best to send in either .doc or .odt Libre Office or (Open Office) format. I can accept schematics from LTspice, Eagle, Kicad or Ktechlab direct.

Contributors
The home page is translated into 10 languages and I am most grateful to the following people who have made this possible :-
Amanda Van Leeuwen, Ricardo Venegas, Sindhu Adi Wijaya, Paulo Roberto do Amaral, Maria Rosendahl, Marco Deferre, Fidel from Ukraine, and Hartmut Schneider. All contributors appear on my credits page link below. You can also see my viewers gallery and disclaimer. I am also particularly grateful to Ron J whose work appears prominently in the Alarm Circuits. Ron has also kindly made his meticulous artwork available to use.



Frequently Asked Questions
i) Most components are labeled using the System International numbering system.
ii) Please don't ask for schematics for domestic electrical or electronic equipment, I don't have any.
iii) This site is non-commercial, I do not sell or buy, components or circuits on this site.
iv) The update page contains links to the newest pages on my site.
v) I regret that I cannot help with college/school/university/project work, but see links below.

Help with Homework, College or University Projects
Sorry but I cannot help with college or course work. However, I would suggest that before asking for help you have tried to solve the problem yourself and searched on google. If you are still stuck try the following forums:

Electrical Engineering Community This site has discussion forums and a great source of information.
Electronics Point
Electro-tech-online

Newsletter
I also run a newsletter hosted on Domeus. If you would like site updates, enter a valid email address and press send, you will receive an email from Domeus. Click to accept the invitation, you do not need to do anything else, the password Domeus offers you is for services on their site only.

About the Web Master
My interest in electronics started with radio. I was about 7 and remember tuning my parents old radiogram and was fascinated by the plethora of radio stations. It wasn't long before I started my first project a crystal radio, though not having a very efficient aerial, I only heard local broadcasts. I would also peruse circuits and books in libraries and progressed to alarm circuits and then audio circuits. Not everything worked first time and much knowledge was gained by fault finding these circuits.

Electronics can be both rewarding and challenging. It is always good to hear from fellow hobbyists around the world. Some recommended reading "The Art of Electronics" by Harrowitz and Hill, and if you are interested in circuit simulation,"The Spice Book" by Andrei Vladimerescu is technical and a great reference.

Other hobbies include short wave listening, music, and computers. I started using Linux in 1999 and have tried most distributions. I'm currently running PCLinuxOS and Ubuntu. I'm active in most of the linux forums.