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Super quick simple electronics question

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Illah

Member
Joined
Mar 26, 2002
Location
San Francisco
If you'd be so kind as to look at this scematic real quick:

circplan.jpg



Now, here's the question. I want to 'split' the +12v and put one end to the middle pin of the potentiometer, the other to the collector of the trans. Then from there I need to hook one of the side pins of the pot to the base of the trans, right? What about the other side pin of the pot? Does it matter?

Thanks!

--Illah
 
OP
Illah

Illah

Member
Joined
Mar 26, 2002
Location
San Francisco
Anyone? I have the parts in front of me, solder and all! I just wanna get this setup.

--Illah
 

macklin01

Computational Oncologist / Biomathematician / Mode
Joined
Apr 3, 2002
Location
Bloomington, IN
I use that same basic design. See

http://www.math.umn.edu/~macklin/fanbus/basic_design.gif

You can either connect the unused end of the pot to the center lead or leave it alone altogether.

I can speak for this design -- it works well and doesn't need a HS on the trans.

One thing you might want to consider -- solder two idential transistors in parallel in your design. It splits the load on the transistors and reduces the strain. Should add to the MTBF without significantly increasing cost.

-- Paul