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4QD-TEC
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This page contains the main index to the electronics section of this site, with certain other general information which you may need.
This site, large though it is, is only the public 'front end' of a subscription electronics club - 4QD-TEC.
For more information and how to join, use the 'Join' button at head or foot of any free page.
You will need images on for this area of the site - to see the circuit diagrams (PNG or GIF).
As these pages of circuits (a lot more at the bottom of this one) are proving to be of interest to browsers we are gradually expanding them to give a larger selection of interesting and, perhaps, useful circuits as well as a lot of various information. We want to make our site interesting and useful - not pretty and impressive. Hopefully some of you, one day, may need a PWM motor controller and will remember us!
I know a lot of visitors are coming straight to this index rather than to our Home page. You are welcome - but there are pointers on the home page to other info which is not circuit diagrams. There will be links to other sites, info on manufacturers and suppliers of goods related to our business as well as information on computing and electronics and maybe other subjects. Who knows what else! The author has written for computer magazines, DIY magazines and others.
4QD sell motor controllers: we do not sell web technology. Therefore you won't find animated GIFs, Java Applets or advice to use one particular browser: our pages should work with any browser that can display GIFs and JPEGs. There will be added, in time, one or two JavaScript calculators however.
All of which the above makes this site a very good educational resource, and it is evident from the comments we get that it is being used as such. So we intend to expand this area - partially in an attempt to make the site commercially viable. We intend therefore to make circuit board designs available for some of the projects and educational establishments that require reasonable quantities (25 or more) are welcome to contact 4QD to discuss their requirements. We will be able to supply circuit boards for some of the interesting circuits, with kits of parts and assembly information. We can clearly link the boards and kits to constructional information on this site, or we can supply printed out information.
I have however tried to make this site easy to read, so the descriptions aren't too simple or full of maths. Maybe you want this altered - let me know.
The public area of 4QD-TEC is large: future expansion will be in the private area, which is only available to members. This data includes much on PWM motor control (as you might expect) but also lots of other information, including more detailed circuit descriptions and constructional information.
4QD manufacture electronic motor speed controls for battery motors. We make our living by selling some of our circuits. Obviously I'm not going to publish commercially sensitive circuits! However a lot of the ones I publish are original and although you are free to use them for your own entertainment, the author retains intellectual property rights to them insofar as they may have commercial value. If you do find them commercially useful, then please contact me for permission to use them. Under no circumstances may they be published in any form without written permission from the author.
These circuits are supplied 'as is' at no charge, for your enjoyment. So far as we are aware they are complete and work but we can take no responsibility for any errors. We will of course offer any reasonable assistance if you do hit problems. Most, but not all, of the circuits are our own design. As far as we are aware no copyright other that the author's exists on any of them but we cannot guarantee this.
The list below is not as long as it looks because it sometimes contains many entries to the same circuit. If so, this is because the circuit has many uses or can be called different things (besides - it makes the list longer!)
Key: Left hand Column
Some of these items are public. Some are members only. Some have a public 'front' but more is available to members. So the left hand column is a key to what is what.
| MO | Information is Members Only. You will be asked for a pasword. |
| ML | Information is Members Only. These are 'Library' collections of circuits with no write-up.
You will be asked for a pasword. |
| PA | Public area information. |
| PM | Public area information, with more information available to members. |
The index is one long list of all available circuits in alphabetical order. It is however divided into the following areas:
| 4QD Sites: |
