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Push button controlled Potentiometer? How?


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Hey guys!

I've spent 3 hours researching different DPPs (digitally programable potentiometers) but everything I find seems too overkill for what I need.

Here's my cicuit idea:

The CPU cooling fan in my computer operates from 3000-7000RPM using a small pot wired into a simple LM317 circuit ranging from 5v to 12v. I want to be able to find an electronically controlled pot that I can control through two momentary switches (up and down).

Is there an IC that someone knows that I can use to do this? If so, would you mind giving me a quick rundown on how to control it and set the range? My electronics knowledge is slim (only grade 10 electronics) but I have a great problem solving mind so if I can get some simplified terms, I can work from there.

Thanks guys!

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Thats great guys. One question though: What is the resistance range on the DS1669? I can't seem to find it on the data sheet.

<EDIT> Nevermind guys, was looking at the wrong datasheet. Looks like I can get it in a nice 10k flavour </EDIT>

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  • 1 year later...

well shoot lol.... I thought someone might have replied about a proper opto setup..  ::)

I think its just a matter of cool and asteticly pleasing application when it comes to the PC.... I am wanting to know for another PC application.... but mine is for controling brightness of LED's :) which are rated from 30 to 180mA accordingly.. so I would have to use the opto...

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???
You never got it? I sent it a long time ago  :-\
I never heard from you so I assumed you had gotten it. I havn't gotten any e-mail's

I will build another one and send it again with a way to track it.. UPS delivers to Canada I assume?

USPS is ticking me off :( I have lost so much money on them loosing stuff the past 6 months :(

I am sorry man... I will have it out this week and will PM you a Tracking Number...

BTW.... The Case of Hope project it went into was sold. but it didnt go as high as we expected.... but everyone loved the Gem and circuit.

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The peeps on PR did start calling it the heartbeat of the case.. :)

There was so much that could have been done with it... but as they say ... hind sight is 20.20 hehe....

I am going to have to get back down to my house I apparently had not sync'd the folder that the design was in to my laptop and I am at a friends but I think I should be able to get it out by the weekend...  :)

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