Can you do a 7v Mod with resistors?

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Lord Banshee

Golden Member
Sep 8, 2004
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ok i was thinking about getting some Yate Loon instead of Nexus and want to do the safest 7v mod (with resistors)..

Here is what i was thinking

V = I * R

So i want a 5 volt drop on the 12V line (12 V- 7 V) = 5V
5V = (.3 A)(Ohm) = 16.6667 Ohm

So if i put a 16.5-17 Ohm resistor in the 12V fan line it should give me 7V to the fan right?

*edit* if this is correct would 1/4 watt resistors work?... if not what kind of watt do i need?
 
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DJMiX

Golden Member
May 31, 2001
1,603
1
81
nexus fans are yate loons with the resistor ..

so I see why this will not work.

I just do the 7 volt mod by cable connector never had a problem
 
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EagleEye

Senior member
Nov 5, 2005
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Originally posted by: Lord Banshee
So anyone know the wattage the yate loon uses?
Click to expand...

Doesn't Power = Voltage * Current (P=VI), so, for .35 ampress running at 7 volts, that would be 2.45 watts.
 
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Lord Banshee

Golden Member
Sep 8, 2004
1,495
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lol...

P=I*V doH!!!

Hey those 1N4001 diodes sound like a better and easier options. Use 4 of these and the fan should slow down enough for what i want to do :)

THanks again for that link GalvanizedYankee..
 
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GalvanizedYankee

Diamond Member
Oct 27, 2003
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Originally posted by: Lord Banshee
lol...

P=I*V doH!!!

Hey those 1N4001 diodes sound like a better and easier options. Use 4 of these and the fan should slow down enough for what i want to do :)

THanks again for that link GalvanizedYankee..
Click to expand...

Your welcome. That's a very old Brit site. Those guys are really into DIY.

Ever wonder why a reverse polarity protected fan never gets the full 12V the PSU offers??
Well now you know :) I'd go with diodes over resistors myself but use a Sunbeam Rheobus instead.

...Galvanized

 
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Lord Banshee

Golden Member
Sep 8, 2004
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i am ordering all my fans and stuff from jab-tech, so unless the fanmates become in stock before i order, i will just take a ride to radio shack and spend 2 bucks for 8 diodes :)

I have yet to find a fan controler that pleases me :) and my pocket lol
 
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DJMiX

Golden Member
May 31, 2001
1,603
1
81
Originally posted by: Lord Banshee
"so I see why this will not work. "

what do you mean, can you explain?
Click to expand...

soory "so I don't see why this will not work. "

 
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Zepper

Elite Member
May 1, 2001
18,998
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Tip: Don't put the resistors or diodes in the ground lead of your fan. Put them in the Positive lead.

.bh.
 
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GalvanizedYankee

Diamond Member
Oct 27, 2003
6,986
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Originally posted by: Henny
8 diodes???? Use one 5v zener diode.
Click to expand...

Yep. OP, read the link I offered again. Use a Zener if you can find it.

You could even put it on a DPDT switch for 12V or 7V operation. There is a tutorial at
SPCR under fans & controlls for using a DPDT switch.


...Galvanized

 
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GalvanizedYankee

Diamond Member
Oct 27, 2003
6,986
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To all those that liked the other site I linked. Mark this one too. Both were posted by other members and both have served me well. This one, The Electronics Club, may seem basic and just not techie enough for some. But a good foundation is where it starts. Be sure to check the internal links for a quick look around.

http://www.kpsec.freeuk.com/index.htm

It's not the least bit suprising that it's another Brit site. Those guys are DIY (do it yourself).


...Galvanized
 
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Doctorweir

Golden Member
Sep 20, 2000
1,689
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1) Connect positive line of fan to +12V
2) Connect negative line of fan to +5V
3) 12V-5V=7V
4) Ur done with easiest 7V mod
5) Profit
 
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EagleEye

Senior member
Nov 5, 2005
982
0
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Originally posted by: Doctorweir
1) Connect positive line of fan to +12V
2) Connect negative line of fan to +5V
3) 12V-5V=7V
4) Ur done with easiest 7V mod
5) Profit
Click to expand...

Doesn't this also stress your PSU considerably as well?
 
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