CurtPalme.com Home Theater Forum

[barclay66]

[tschaeikaei]

I'll have a look into this mod. But did you try other fans?
I think we talked about this last year when i was at your home, but i don't remember everything...
Are those "silent wings" really that much quieter than other (cheaper) fans?
I have the Arctic F9 pro TC (PWM, temperture controlled) as LVPS fans and they work quiet enough for me.
Sure, quieter is better, but i'm not gonna pay 15 to 20€ for a single fan.
The arctic came about 4€ per piece. Huge difference there.
Which step down converter did you use to control the fans?
I declare to be a LM317- guy, but for that many fans... it would be a lot better to use regulators that don't just burn half of the power.

I do currently have one of the two marquees set up for movies on a white wall, the other is stripped down
and waiting for it's green tube. I think i'll try everything on the not-in-use one and write her about it.

Today my screen material ( glass fiber fabric and epoxy resin) arrived.
Thats the main project now. There is a thread in the "Screens" section for this... Maybe someone will have a look...


Regards, Julian

[barclay66]

Hi,

I selected the fans based on their technical specs. I looked for fans that would have the same or more air flow and air pressure than the original ones although being quiter. For this I dug up all sorts of datasheets from different manufacturers (NMB, Papst, Noctua, beQuiet! and some more) and compared all these values. For the best three I looked for pricing and the beQuiet! had the best package. And I really can say that they are very quiet, especially when You compare them against the original ones. An Yes, they were more than 4€ per fan, but I thought that good cooling would preserve my much larger investment (the Marquee itself) and therefore justified the cost.
The voltage regualtors weren't purchased specifically for this project. I took some that I found in my inventory. They are four-legged and their part numbers are PQ05RF21 (5V, 2A, Low Drop) and PQ30RV31 (Adjustable, set at 12V, 3A, Low Drop) if I remember correctly. I haven't drawn the schematic, but I may do so some time in the future.

Here are some pictures. The first two show the voltage regulator and fan control board. The transistor-like parts connected to it are the temperature sensors. The other two pictures show, how it is mounted on the rear heat sink and how the heat sink is cooled by its own fan. The wooden panel ensures that the airflow from the fan is forced onto the entire surface of the heat sink and at the same time it provides the support for both the fan and the board. The foam ring on the fan ensures that the it will only suck air from the outside as it adapts to the inner surface of the Vision 1 case...

Regards,
barclay66

[thewolfman]

Very impressive and inspirational.

My projector is bare naked, and I sit 2 feet from it at head level, and not concerned about the LVPS noise at all. It's low and almost inaudible, the seller said that it was modded, but It looks completely stock to me and actually think it is, however, the fans runs smoothly and stopping both fans with my fingers makes it not much more quite. The LVPS-fans has blue rubber holding them on and that could have been changed I suppose.

Actually, I'm thinking the fans under the belly is what needs to be changed to make it less noisy, there's quite a bit of dB do be lowered from there as the noise sure seems to be coming from there.

Curtpalme.com should make a small 24-to-12-volt-step-down converter available for purchase, as I haven't found one on the internet, so that everyone could make these changes pretty easy. If I remember correctly, the fans I know about have magnets for bearings to make them airlifted (I think) but making those work with 24 volt is not all that easy for everyone to make.

[dvh99]

did you measure temps before and after under same circumstances and if so what`s the difference as i am very curious.
great work btw.

[barclay66]

[barclay66]

[thewolfman]

[barclay66]

Hi,

The only one I found which has enough air flow while being quiet is this one: http://amzn.com/B0026ZPFDE
Unfortunately, most product specs at Amazon are incomplete. For this one, the air pressure is missing. That sucks!
Look for a fan with at least 60cfm air flow and 0.2mm H2O air pressure (or 0.08" H2O) at less than 25dB noise.
The original ones (NMB 4710NL-05W-B10) have 59cfm and 0.08" H2O at 27dB and run at 1,550RPM...

Regards,
barclay66

[Nashou66]

This is the Fan I want to use. I think BigE took my suggestion and used it in his Marquee.

http://www.cougar-world.com/us/products/fans/cfd_black_hb_fan.html

64.7 CFM, 16.6 DB and 1.74 mmH2O pressure.

Athanasios

[thewolfman]

[thewolfman]

I can't believe I've had my head next to wind turbine all this time. This sucker is noisy! You were right Nashou, I think Couger Vortex 120mm is a winner. On this one segment in the video, he has the microphone very close to the fan, and yes, then it sounds a bit more, but I think the microphone picks up more audio the we will actually hear.



https://www.youtube.com/watch?v=arHLD19DyIs

https://www.youtube.com/watch?v=8eHtZgdusTQ



EDIT: I realize there are 2 versions of them - fixed and not fixed rpm. Which one to go with I don't know, but I wonder if my pc could run the fans for the pj.

Anyway, It would be easier to install a 6 channel fan controller and adjust temp from that. I only use PC anyway so.. a little more expensive but a little easier on myself also. I think. 6 channels, or more even, leaves me with the option to cool more things also, and just like Barclay is doing. To bad they are so expensive these little cougars.


http://www.eteknix.com/lamptron-unveil-fc5v3-fan-controller/

[thewolfman]

Ok, I dug up a power supply that I could use for my fans. It's rated high enough to power all the fans I could ever want, I think, but wonder if I can disconnect the fans on the pj and hook the new once into the power supply? At the back of my mind I believe some pj wont power up if there's no fans running?

I plan on buying the Cougar fans with interchangeable rpm:s because revving them up to 1500 still makes them silent. At a later state, I could add a pc fan controller, either connected to the pc or the Barclay method on the pj itself. I can't afford a controller now with these expensive cougars. I think. It's 62$ inc shipping from Sweden for the fans.

Power supply is rated 12V 2,5A and 30VA.

I could make sure the pj is hooked up onto a power distributor, with a flicker that shows a lit red lamp when active, with the fans connected to the same also, so that I wont forget to power them on. That's my plan in the early stages.

[barclay66]

Hi,

Yes, You can do that. The fans in the Marquee aren't monitored like in a BR909. So You can power them from an external source and leave the internal supply unconnected.
Just don't do that on the LVPS fans. The LVPS and ist fans is an enclosed box and it will be difficult to route the external supply into it without messy cabling. In Addition, You can use 12V fans inside the LVPS easily. As there are two, You just connect them in series...

BTW: Why is the writing in German on Your picture? Are You in Germany?

Regards,
barclay66

[barclay66]

[thewolfman]

[thewolfman]

[barclay66]

Hi,

[thewolfman]

[barclay66]