thats perfect:) dfi lp nf3, Do you think its possible to use the booster without the heatsinks if I keep a deccent fan blowing air over it?
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thats perfect:) dfi lp nf3, Do you think its possible to use the booster without the heatsinks if I keep a deccent fan blowing air over it?
It depends how hot the MOSFETs get with no airflow over them and what voltage you are running. It should be ok without the sink if you have good airflow over the MOSFETs and you aren't drawing too much current from the bosoter.
Hi all.
I have a booster and ABIT AS8 and i feel very big droop too. it's about 0.2, from 3.5 to 3.3, and it's fluctating too.
I have a stable rails, since my PSU is OCZ powerstream.
What do you recommend me doing first? Only to replace the POT? does it have to be a 25 turn or "the bigger it is, the better it is" ?
Try just changing the pot first, and if it doesn't help, try the mod.Quote:
Originally Posted by b|lly
Edit:The number of turns on the pot shouldn't be important as long as it is a multi-turn type.
persivore, Im having some trouble with the complicated mod, I think I have it right, but it doesnt regulate voltage :confused: I take a photo of everything this afternoon. I connected one wire from the oppamp wrong first time and the display showed 6,6v or something, maybe its damaged now?
I had one huge jump to above 6 volt but i turned off comp instanly, no damage.
The booster shouldn't be able to supply more than the 5v rail, unless something is shorting to something connected to the 12v rail. Check the voltage that you get at the middle pin/wiper of the variable resistor. It should be the exact same voltage that the booster gives out.Quote:
Originally Posted by gbglassen
How long was the jump for? Was it at power-up? On the neo2 the booster was tested with the display on the booster would say 6v when first powered up, but I think this was due to the display reporting the voltage wrong at power up.Quote:
Originally Posted by Ubermann
The jump came when i had computer running and nothing happend when i turned pot.
It was the capacitor that was to slow first..then somehow it just jumped.
But havent had that trouble any more.
interesting...I don't know why that would have happened tbh. I will look into it.Quote:
Originally Posted by Ubermann
here is a pic. can you see anything wrong?
Sorry, I think it might have been my fault. You need to connect pin 8 on the opamp directly to the 12v line instead of how I showed it in the picture. I'll change it in a minute. Nothing would have been damaged by doing it as I showed it in the picture tho. It would just have not been able to regulate the voltage above about 2v.Quote:
Originally Posted by gbglassen
This is interesting...comparing my booster to yours, i see 2 big differences. I dont have that soldering points you have (marked on your photo). I have it left out..no soldiere there. This goes under the big chip so I cannot see if it's left out or what?
The solder pads are for capacitors. You might have a different version of the booster where OCZ decided not to include the solder pads for the capacitors on the PCB.Quote:
Originally Posted by b|lly
Would that be a reason for my big voltage fluctations?
I doubt it tbh. Adding extra capacitors wouldn't be able to compensate for voltage fluctuations.Quote:
Originally Posted by b|lly
works perfect now, max drop is 0.01V :D Thanks for all your help persivore :toast: got me 4 more mhz thanks to you :)
I was unable to find suitable POT (I've order it though, but it will take awhile to get here). But I have a spare 50kohm trimmer here, is it ok to change pot with trimmer?
If you use a 50k with the values of the limiting resistors I specified, the voltage will be adjustable between about 4v down to about 300mv, so lots of the varaible resistor will appear to be ineffective, because if the booster is set to a voltage lower than what the motherboard is giving out as Vdimm, the boards Vdimm supply will over-ride the booster.Quote:
Originally Posted by b|lly
If you use a 50k varaible resistor, be careful not to set the boosters voltage too low because it could short out the motherboards Vdimm supply. You could use the 10k variable resistor from the booster however.
I'm talking about the "mod" to just change the POT. Some ppl in this thread said they've change it and it worked for them. But I havent found a suitable POT, and then though if I could just use the trimmer I have here.
I just wanna change the original POT for a start, then move to your mods if it aint gonna work :)
Using a different value pot on an 'unmodded booster' would change the voltage limits set by OCZ, but it would probably be ok as long as you only used the upper 1/5 of the pot.
Hm..no luck...I think droop is even bigger now, it goes from 3.39 all the way down to 3.17 :) .. I guess it's time for real mods?
Which mod do you advice me to do?
If your PSU rails are quite stable, then the basic mod is probably the best one. If you don't have stable PSU rails then the complicated mod should be better.
They are pretty stable ;)
rail | idle | load
5V | 5.09 | 5.09 (fluctates for 0.02)
12V | 12.33 | 12.22
3.3V| 3.4 | 3.4 (fluctates for 0.01)
I have OCZ powerstream that's why they are a bit higher then usual ...
OK, i'll go for basic mod, hope it works ;)
Hi guy's, been on holiday for more than 2 weeks..
Nice job persivore... I'd say this tread is worth to be a sticky 1 :D
I still didn't try the mod on the booster, but I'm using separate mosfet's because I also need to regulate the vbt/vtt as my board's supllie is smoked.. Maybe we can make a 3rd version of the mod where u use the other half of the lm358n and a mosfet (irf640) to make a vbt/vtt supllie, because with only the booster, the vbt/vtt doesn't follow vdimm... I think the only extra components are a mosfet and 2 identical resistors and maybe a small cap..
When using a decent mosfet like a irf640 orso I don't think it's necessary to heatsink it as vbt/vtt doesn't draw big currents...
I'll say it again: Nice job persivore!!!
Rub
While removing the POT i've come accross this idea...Since there is nothing in your way now, you can put on some old GFX cooler(on the mosfets ofc:) ). I have a couple of spare here (from Radeon and Nvidia) and they fit perfectly.
It's and active cooling since there is a fan installed with the sink.