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Previous posted today on xbox-scene by myself
I will attach a picture of my guide. How you fit it into the console may vary, OR you could even have it outside.
Thanks to http://myworld.ebay.co.uk/pic-projec...MEFSX:SELLERID
For the Potentiometers.
I would also like to addthat for my current, i used 2 500k potentiometers. I varied with 1m and 2.2m's but they all had the EXACT same effect. none of them allowed for single potentiometer use.
Diffirent Sub-Forums. just incase someone needs this and doesnt go into the other forum.
well, yet another person who didint read the rules
-1 Post Count, 1st warning, other post deleted.
so normally the ps3 decides if the fan needs to run faster, but looking at your diagram the fan is directly connected to the 12v, so what happens if you lower the fan speed and the ps3 is getting hot.
or am i missing something.
the way you draw an potentiometer may confuse people.
There is no reason for TWO Pots, only one, with a Diode to prevent current from flowing back through the header. The diagram works for him, but to simply for everyone else?
Originally Posted by Mr_WoRRieD
Run 12V constant to POT, then to Fan, you don't even need a separate GROUND.
Use a POT that has a CLICK off selection.
PCB | \ | /
/ | \
The ">|" is the spliced in diode.
The diode prevents the full 12V source from going back to the PS3's Mainboard
at the fan Header. SO, this is a separate 12V source ran to the fan lead that
is controlled by a POT. When you turn the pot OFF, the PS3 fan goes back
to normal operation. Use a normal P-N Junction Diode. You cannot use
a Zener diode, because the voltage will be higher then it's Zener voltage.
Zener voltage is what's going through it, which will be LESS than the 12V
constant that you're putting to it from the other side. When voltage coming from
the other side is higher than what's at the Diode, the voltage will flow back
through a Zener Diode.
There isn't even a need for any GROUND, the fan is already grounded.
You are only putting a constant +12V source to the fan wire that is normally
carrying a variable voltage. Thus the lower the voltage (controlled by PS3)
the lower RPMs the fan sins. This is controlled by the heat sensor, so
the hotter it gets, the more voltage it puts to the fan. You are simply
putting your own voltage to it, controlled by the POT.
You can then turn up the voltage without it back-feeding into the OEM control circuit.
Remember, the source VDC is 12, so you don't think by turning the pot too far, that you increase the voltage past 12, it will only go as high as the supply, JUST in case anyone wonders.
in your example the ps3 still controls the fan's voltage through the diode, and the pot only can increase voltage right? ;)
his solution could damage the ps3 if speed is too slow.
In the diagram, the wire is cut fromfan and attached to pot1, when using 1 potentiometer it DOES NOT allow for very reliable chaging of speed.
The slightest turn changed it from running full speed to off, Which is why using 2, i found out that i was able use the second POT to be able to have a full range of control from almost off to full speed.
if you have a better solution which has been tested then please post that
Not only that, his chart does not say what VALUE POTs he is using, like 10K Potentiometer, and so on, so people who want to do this, go and GUESS and screw it up. The DIODE is there incase, so you don't back feed...
Originally Posted by Mr_WoRRieD
My circuit, the PS3 still controls the fan OEM, with the POT added, you can increase the fan RPMS by increasing the voltage to it, yes. So, even if you have the POT OFF, the PS3 will continue as normal. You simply match or increase voltage with my circuit. It will NOT go past 12V, so don't worry.
To get a pot, you need to use the math formula, don't just add any stupid POT. You can get them with or without a switch to off, to turn it completely off when all the way to the left, at FULL resistance.
You want a pot that has the resistance to control 12V from +1 to +12. With a 6V source, you use a 1K POT, so with a 12V source, maybe use use a 2K pot. Not an EXACT science, but, the lower the resistance in the POT MAX, the less turn of the knob you need to get from 1V to 12V. So, he must be using VERY LOW resistance POTS to have it be so sensitive.