Fans for the PL700's, and the DC protect circuit board

[Gibsonian]

Couple items I'd like to discuss/comment about:

First is the DC protect boards. I initially had a problem with the relays kicking out on me during high output sessions, as you may remember. Since discovering some of the resistors were of incorrect value on the board (initial run, an error or two, humans you know) Lee sent me a replacement that I installed and have throughly tested and can report I've not been able to kick out the relays no matter how loud I go. I've had the needles banging on the meter right hand stop, staying buried for a few seconds at a time on the stop, and no problems at all. I am tickled to have protection with no muss or fuss. Happy as heck here with the amp protection board. Also makes me respect the little 12" sub drivers I'm beating the heck out of too!

Cooling fans - Am getting ready to connect some new subs I've made to the PLWO 700 and they are 4 ohm, not eight like I have been running. I have 2 DC cooling fans that do fine now keeping her cool with 8 ohm drivers, but am concerned that the 4 ohm speakers combined with high output may exceed the ability of the fans to keep the 700 cool. I would like to know what model/brand fans the rest of you are using so I can compare specs for cfm, and noise levels. I really think I need a higher volume fan to keep all of the magic inside.

 

[laatsch55]

Scott I haven't run mine with a 4 ohm load but the "bangin the meters" thing at 8 they are actually cold.

 

[Gibsonian]

Fins on my 700 get warm. Without a fan, they would be really hot, to shutdown hot I would imagine.

 

[orange]

Lee, thisis a concern with me for my Pioneer SX-D7000 as well. Where in the scheme of a receiver's PS might one consider to tap 5 or 12 VDC to employ say, my huge brushless computer case fan?

Give me a few minutes while I find it in my PDF and copy the section...

 

[orange]

Since this is a general concern about big amps (cooling) I'm going to put up my receivers PS as an exzmple in general and ask how you can determine where to introduce such things into a power supply.

?[attachment=0:3dkl08b9]SX-D7000PS dia.jpg[/attachment:3dkl08b9]

PS Would a thermostatic switch help

 

[laatsch55]

Steve, referenced to ground, check the voltages available leaving the regulators, if not there, try the filament volage.

 

[laatsch55]

http://www.overclockersclub.com/reviews/nzxt_sentry2/

Try this link Scotty, may be just the thing.

 

[orange]

Steve, referenced to ground, check the voltages available leaving the regulators, if not there, try the filament volage.

ROGER

 

[Gibsonian]

http://www.overclockersclub.com/reviews/nzxt_sentry2/" onclick="window.open(this.href);return false;

Try this link Scotty, may be just the thing.

Might be a smidge more than this guy needs for control. Do you know what CFM your fans are doing Lee?

 

[Gepetto]

I would not recommend tapping into any internal audio supply voltage for running a noisy fan motor. They produce very large amounts of commutation noise when they switch phases. Go separate for running fans.

Here is what you need:

http://www.bigassfans.com/product/yellow-jacket/

 

[jbeckva]

I would not recommend tapping into any internal audio supply voltage for running a noisy fan motor. They produce very large amounts of commutation noise when they switch phases. Go separate for running fans.

Here is what you need:

http://www.bigassfans.com/product/yellow-jacket/" onclick="window.open(this.href);return false;

I just had a picture of Lee, sideways holding on to the rackmounts of his PLWO's to keep from blowing away, all while still managing not to spill a drop of his Crown n Coke...

 

[laatsch55]

Amen!!!!

 

[ksrigg]

I originally posted this in another thread, but it may more suited here:

I know there has been some discussion on fans for the 400 and 700 amps, and I recently found thes on GearXS.com for 39 cents each. It had to be mispriced, but they may still be available. They are 12 V DC and draw .14 amps each. Three of them could be mounted in a frame ( as Lee has done) as they are smaller than the ones Lee made for mme. Question is...how to wire them. Do I simply get a 12V DC wall wart and wire the three together and on to the end of the power supply? I'm just looking for some help in doing this the right way...I know I probably don't want to series wire these? How is the best way to go about this...

Here is the link if anyone else would like to stock up on some 39 cent fans.....

http://www.gearxs.com/Everflow-80mm-2PI ... fan&page=2

 

[laatsch55]

You could wire them both ways and see what works best.

 

[mlucitt]

Wire them in parallel but make sure the wall wart can put out about 500mA.

 

[ksrigg]

Look at this. I'm thinking one power supply per side supplying power for 9 fans (.14A each) side [attachment=0:1ijgspi6]$(KGrHqZ,!oEE63WY+DDeBOzGdtOf1Q~~60_12.jpg[/attachment:1ijgspi6] to each power supply. Think this will work? Looks like enough power, and will cut down on the number of plugs I have to use.. There is a 5 Amp version and also 2 amp,3 amp, 5 amp...you name it...

Oh yeah....the link:

http://www.ebay.com/itm/270859354036?ss ... 1423.l2649

 

[jbeckva]

Well it sure won't set ya back too much, so it'll do in my book.

But also.. if you had or know of where to get an old working PC power supply, that's "free". It's an easy modification to "jump" it into providing 12 volts (at many amps usually). Either way should be good.

 

[mlucitt]

Be careful, those are switchiung power supplies and they are very noisy. You don't want them anywhere near the amp, preamp, or interconnect cables.

 

[laatsch55]

Ah.... there's always a catch.

 

[ksrigg]

How far away from the rack? I already ordered one of them. Maybe I sheild the little bugger some way..All I'm trying to do is power the little fans without having to buy a $15.00 power supp;y for each one. I thought I had it fugured out. I should have known better. The amp[s don't get THAT hot anyway, os maybe a couple of 20" fans sitting behind the rack will do the trick and I need to forget this project..