pwm control
 

I just finished installing my PWM controller :D

http://www-personal.umich.edu/~kbernas/pwm.htm
http://www-personal.umich.edu/~kbern...ll%20-%202.jpg

wow ^^

I was just thinking of rigging up some switches to toggle each of my fans from off to 5 to 7 to 12 v maually. Needless to say; I found your project quite impressive :D very cool

well....it's very complicated, what sort of amperage can it handle? How much would one cost?

What all can it do exactly? I didn't read your whole site but ther were pictures of other things in there besides.

token:
Thanks for your compliments. It really isn't that complicated; I learned everything I needed to know, designed it, & built it in under 1-week. I only took one circuits course in college & most of that material I couldn't remember without review. I also have no professional experience in electronics.

Brad:
It handles 4A. The details including costs are on my updated site:
PWM Homepage

webmedic:
It adjusts the speed of fan(s) according to the temperature of a probe, displays the speed of the fan in 10% increments, has an RPM monitoring passthrough, & has a switch that switches the fan from the thermal speed control to 12V (manual full speed override switch). The switching for the override can also be done by a Digidoc. The speed control is accomplished using PWM (Pulse Width Modulation). A power MOSFET fan output makes the speed controller very efficient & capable of driving up to 4A of fans (or a single 4A fan, which I have not been able to locate yet :P).

Do you still have any floating around? I wouldn't mind geting one.

You speak of this "DB crimp tool".... Mind posting a picture?

Yes, I always have kits & PCBs for sale. I currently have a few pre-built units left over too. Please check out my PWM project homepage for updated details including info on kits, PCBs, & pre-builts for sale (pre-built unit prices may be negotiable for reviewers with websites):

PWMadness Homepage

I got the crimping tool I mentioned here: Crimper Tool @ Jameco

It makes very clean crimps that look machine made.

OK, I've been partially AWOL for a while now, but I have to say, nice job! I like your implementation, especially the display.

The one thing that I would prefer is something like psylence's stuff where he used a PIC chip to display temperatures, RPM's and other stats onto an LCD. But, that's considerably more effort, I think. Oh, and more expensive too.

i've been longing to learn microcontrollers for a while now, but i'm out of college so it would take considerably more effort for me to fit a class in. i've been trying to get in on a few microcontroller based projects to learn on the fly, but no luck yet.

do you have a link to psylence's things?

Some of the folks at Gideon Tech are working on a software interface for a microcontroller circuit that is supposed to be an all inclusive PC mechanical management system. It will read temperatures, control fans, pumps, & stepper motors, & provide a GUI to read & log data & make adjustments. I've been dreaming about designing something similar, so I offered my humble related skills in hopes of learning from the project, which seem to still be at its early stages.

Here is psylence's sig from another un-named forum:

Pretty! http://www.veys.com/nick/case_mods.shtml
Sexy! http://www.veys.com/nick/custom_electronics.shtml
Sleek! http://www.veys.com/nick/electronics_tutorials.shtml

As for the stuff on GideonTech, I'll have to browse on over and take a look. Sounds interesting!

Microcontrollers are EASY if you can do a PWM circuit and do simple programming. That's what they are for. There is a great wealth of info out on them if you just do a simple web search. Sample programs, kits, sample circuits, huge archives of email exchanges (search for the PIC list), etc...

thanks brian.:)

just wanted to say the PWM page is temporarily offline & won't be back up for a month or 2. sorry :(