The above video goes away if you are a member and logged in, so log in now!
PS3 Fan Speed Mods with 555 pulse timer
seeing as the phat PS3 tends to overheat and cause YLOD I'm curious why you would want to reduce the fan speed. I know they can be loud but aren't you just risking premature failure this way?
I have slim and it still gets how enuf to damn near burn me. I would not want to reducing the fan speed at all.
I find it is easier to turn the TV up if you don't want to hear the fan
But to add to the thread instead of bitching and moaning .... Why now use a simple potentiometer to adjust fan speed? PWM is kinda cool but a POT would be so much more simple. Plus you can speed it up if you need too with a quick turn rather than chaning a resistor..... well I suppose you could use a POT on the 555 circuit too.
Sorry, this IS to increase fan speed. Ps3 Fat typically run around 20% which is indeed too slow and too hot.
Ps3 fan needs a digital pulse signal, I've tried the resistor POT mods, they are way too sketchy and unstable.
3.3 V to gray pulse line will be 100% speed, which sounds like a Dirt Devil vacuum cleaner!
ohhh that make more sense. Guess you can tell I never paid attention to the fact the fan had 3 wires going to it :P
Very nice circuit indeed. I can't think of a smaller circuit to generate a custom PWM signal. I suppose if a person wanted you could use a microcontroller like the AVR. By using one with an internal oscillator you could reduce the component list to a single chip and maybe a small filtering cap. Of course you need to be able to program that AVR chip. Easy enough for me but for the average person it might be a bugger.
I'm gonna have to scope the PWM from the fan and check it out for myself. If you want I can post screen shots of the PWM from the o-scope if you don't have one.
@relaxxx if you like or are interested in microcontrollers TI is offering a dev kit for $4.30 shipped. It comes with a programmer and 2 chips. If you're into electronics it sure is a cheap way to play
MSP430 LaunchPad Value Line Development kit - MSP-EXP430G2 - TI Tool Folder
I have a PIC programmer and I was thinking about programming a micro controller. It would be easy code but I've never written code for them before.
Basically if you had a 1Mhz PIC and wanted to produce a 40% duty pulse you could just program it to hold data high for like 4K cycles then low for 6K cycles and repeat. Could be a 3 wire mod if you get the 3.3V from the PSU.
guys, please check this out. this only using 3,3v from power supply output. do you think this is ok??.. maybe you can help with the spare parts values...
Last edited by mramen; 02-18-2011 at 12:11 AM.
I am hoping fan mods can be written into CFW soon, like I have on my jtag 360
Is that just a standard NPN transistor? Ballpark pot & resistor values? I can try and rig something like that next time I'm messing around with one.
Originally Posted by mramen
yes, you're right.
Originally Posted by relaxxx
I have built the first schematic you posted (the 50% duty cycle one) and although everything seems to work fine the fan is running way too fast.
It appears to be running at full speed, could I have connected something wrong somewhere do you think?