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post #271 of 403 Old 05-09-2013, 09:23 AM
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Quote:
Originally Posted by andyc56 View Post

I just looked at his post in this thread, and he has a very clever solution. He wires two 12V fans in series across the 24V fan control line. This way, each fan has 12V across it and no voltage conversion needed, no power wasted in series resistors.

I just smacked myself on the forehead for not thinking of that. tongue.gif

me too

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post #272 of 403 Old 05-09-2013, 09:24 AM
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Quote:
Originally Posted by mal01 View Post

I looked at that and can't really see exactly what he did, I did pm him though, guess I need two new fans no matter what though.

PM him and ask. seems like he would be willing to help.

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post #273 of 403 Old 05-09-2013, 09:26 AM - Thread Starter
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I did.
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post #274 of 403 Old 05-10-2013, 07:42 AM - Thread Starter
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Any of you guys know how to do this? Johnplayerson hasn't responded.
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post #275 of 403 Old 05-10-2013, 07:52 AM
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If you'd like, I could post a wiring diagram showing the electrical connection of the fans, based on a reading of johnplayerson's posts. Should I do that?
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post #276 of 403 Old 05-10-2013, 08:07 AM - Thread Starter
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That would be great, thanks!
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post #277 of 403 Old 05-10-2013, 08:33 AM
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Okay, I'll give it a shot.

This is what I understand the stock setup to be:



And here is the mod showing the series connection:



Assuming identical fans, this puts 12V across each fan. There's a nice review of fans for quiet computing at silentpcreview.com (SPCR), which might be a good place to start for choosing the fan.

The computer fan here on my desk has three wires: red, black and yellow. I'm almost certain that black is ground, red is 12V, and yellow is the tachometer connection (so the PC software can display RPM). The latter could be left open if there's no tach facility on the circuit board of the Cerwin-Vega.

If in doubt about wiring, there's a fan forum over at SPCR, and the proprietor of the site, Mike Chin, is an audiophile, so I'm sure any fan question, even if non-computer-related, would be welcome there.

Edit: Oops, I should add that you want a 3-wire (DC) fan, rather than a 4-wire (PWM) one. The Noiseblocker B12-2 looks good for noise, but the question is whether the cooling will be enough.
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post #278 of 403 Old 05-10-2013, 08:52 AM - Thread Starter
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Thanks for that, doesn't look too bad. I already bought some fans, the ones Brian linked to a page or so back.
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post #279 of 403 Old 05-10-2013, 09:00 AM
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Oh, okay. That is a PWM fan, but it will still work. I found a PDF file with the pin assignment here (table 1).
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post #280 of 403 Old 05-10-2013, 09:24 AM - Thread Starter
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Quote:
Originally Posted by andyc56 View Post

Oh, okay. That is a PWM fan, but it will still work. I found a PDF file with the pin assignment here (table 1).
What, is there a different fan I should use?
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post #281 of 403 Old 05-10-2013, 10:03 AM
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The PWM fans work fine with a DC fan connection, so you are fine with those fans.

12V PWM fans work with a 0-12V pulsed signal by taking the DC value of the pulsed waveform. So if it's a square wave (50 percent duty cycle), that's the same as having 6V DC. Hooking up 12V DC is the same as having a PWM waveform with 100 percent duty cycle.

DC fans typically don't work well with PWM waveforms, but PWM fans work fine with DC. There's more info in that PDF file that I linked. My previous recommendation of a DC fan was just to make it as easy as possible to figure out which pin is which (3 pins as opposed to 4), as I didn't realize you already had the fans.
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post #282 of 403 Old 05-10-2013, 10:09 AM - Thread Starter
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So, the only real difference with these fans is splicing an extra wire in, right?
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post #283 of 403 Old 05-10-2013, 10:13 AM - Thread Starter
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I could return these and get something else if it would work better!
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post #284 of 403 Old 05-10-2013, 10:23 AM
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The fans are fine - it's just a matter of getting the hookup right.

To get the fans spinning, all you need is a connection to the plus (12V, yellow wire, see PDF) and minus (GND, black wire, see PDF). The tach, if used, needs an additional wire. The tach signal is referenced to ground, so if it needs to be hooked up, it would be for the fan #2 in the diagram, as its ground connects to the ground of the 24V header on the amp's PCB.

You'll need to look inside the amp to see the fan header connector on the PC board - how many wires to the fan, and their colors. If there are more than two wires per fan, I can make a revised diagram showing the hookup of the additional wires.

Edit: Here is a web page showing the pinout of the 3-wire fans.

Edit 2: Here is an Intel web page showing more clearly both the 3-pin and 4-pin pinouts.
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post #285 of 403 Old 05-10-2013, 10:35 AM - Thread Starter
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One of the fan s wire's, red and black only!
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post #286 of 403 Old 05-10-2013, 11:01 AM
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Excellent! So no tach, just 24V and ground.

The connections should be as follows assuming you've got 4-pin connectors on your fans.
  • Green and blue disconnected on both fans (sense and control).
  • Amp red to fan #1 yellow
  • Fan #1 black to fan #2 yellow
  • Fan #2 black to amp black

Edit: The Intel page has the wrong wire colors. The PDF and this page are correct.
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post #287 of 403 Old 05-10-2013, 11:09 AM - Thread Starter
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Thanks, I think:) should be getting the fans tomorrow and hopefully get this done with no problems.
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post #288 of 403 Old 05-10-2013, 11:32 AM - Thread Starter
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I'm not going to have to remove the connector on the circuit board am I?
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post #289 of 403 Old 05-10-2013, 12:22 PM
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Not sure what you mean. The connector on the board should have two pins sticking up, like a computer motherboard does. The fan connector just pushes on. You should be able to just pull it off.
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post #290 of 403 Old 05-10-2013, 05:05 PM - Thread Starter
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So I can just pull off the connector and pop the new one on, no soldering right?
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post #291 of 403 Old 05-10-2013, 06:41 PM
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Hopefully the four-pin connector will fit onto the two-pin, although I've only seen a four-pin connector connected to a three-pin one before (as on the Intel site linked above).

Sorry, I had a longer reply, but lost it. We're having an electrical storm here and a power glitch took me out for a few minutes.

If the connector does fit, you'll need to mark which wire on the four-pin connector is the +24V and which is ground with some pieces of tape or something. You'll need to do some cutting and splicing at any rate.
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post #292 of 403 Old 05-10-2013, 07:18 PM
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worst case scenario, you cut the wires and wire nut them together

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post #293 of 403 Old 05-10-2013, 07:39 PM - Thread Starter
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Thank, i'll play with it tomorrow, i'm at work now!
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post #294 of 403 Old 05-11-2013, 11:15 AM - Thread Starter
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Got the fans in, but still not really sure how to hook them up to each other and to the circuit board. The connector on the circuit board is two pin and the fans four. I know you provided a link Andy but it is still kind of confusing to me. If you guys could hold my hand through this I would appreciate it. I have to leave for work shortly so I won`t be able to actually to anything with the fans until tomorrow.

Thanks.
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post #295 of 403 Old 05-11-2013, 03:05 PM
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Quote:
Originally Posted by andyc56 View Post

Excellent! So no tach, just 24V and ground.

The connections should be as follows assuming you've got 4-pin connectors on your fans.
  • Green and blue disconnected on both fans (sense and control).
  • Amp red to fan #1 yellow
  • Fan #1 black to fan #2 yellow
  • Fan #2 black to amp black

Edit: The Intel page has the wrong wire colors. The PDF and this page are correct.

this sounds like what you need

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post #296 of 403 Old 05-11-2013, 05:29 PM - Thread Starter
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Ok, do i use the fan connections on the old fans?
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post #297 of 403 Old 05-11-2013, 05:35 PM - Thread Starter
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What do you mean by amp red and amp black? There aren't any wires coming out of the amp!
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post #298 of 403 Old 05-11-2013, 05:37 PM
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Quote:
Originally Posted by mal01 View Post

Ok, do i use the fan connections on the old fans?

It might be better, instead of trying to jury-rig the four-pin fan connector onto the two-pin PC board connector. This would mean sacrificing one of the original fans from the amp, by cutting the wires (giving yourself as much wire length as you can).

Note that the new setup leaves one of the fan connectors on the PC board unused, as the new fans will be connected in series across a single PC board connector (per the diagram in post 277).
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post #299 of 403 Old 05-11-2013, 05:39 PM
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Quote:
Originally Posted by mal01 View Post

What do you mean by amp red and amp black? There aren't any wires coming out of the amp!

I meant the red and black wires on the fan connector you took a picture of in post 285 above.
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post #300 of 403 Old 05-11-2013, 08:07 PM
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What fans did you end up buying? The stock fan uses 0.28a so I would not use a fan rated higher than that.

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