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MCP-655B Voltage reducer? - Page 3

post #21 of 32
Quote:
Originally Posted by vivithemage View Post
I will have 2 mcp-655's ... and it's rather loud, i'll test it, whats a few bucks. this looks cool too ... plug in some fans!

http://www.frozencpu.com/products/87...V_5V_OF12.html
Sounds like you either have a vibration problem or you didn't bleed all the air out of your loop. When I had my MCP655 Vario on 5 it was dead silent. Some rubber between the mount and the pump can alleviate most of the vibration.

And don't run your pumps in electrical series. 6V might be too low and could stall your pumps.

Anyways you don't need any extra cables at all. Just switch the two pins on the molex connector.



Right now your pumps have pins in one of the grounds and the 12V line. Take the wire going to one of the grounds and hook it into the 5V line. The electical potential between these two lines is 7V. Basically this is what that 'adapter' is doing.
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post #22 of 32
Thread Starter 
how can they be hooked in an electrical circuit? I mean, they'll be hooked to the same 12v1 rail?
post #23 of 32
Is your problem solved?
post #24 of 32
Quote:
Originally Posted by vivithemage View Post
how can they be hooked in an electrical circuit? I mean, they'll be hooked to the same 12v1 rail?
Yep, you are just switching the ground to 5V on the pump molex connector. This will output 7V across the pump.
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post #25 of 32
Quote:
Originally Posted by Seeing Red View Post
Sounds like you either have a vibration problem or you didn't bleed all the air out of your loop. When I had my MCP655 Vario on 5 it was dead silent. Some rubber between the mount and the pump can alleviate most of the vibration.

And don't run your pumps in electrical series. 6V might be too low and could stall your pumps.

Anyways you don't need any extra cables at all. Just switch the two pins on the molex connector.


Right now your pumps have pins in one of the grounds and the 12V line. Take the wire going to one of the grounds and hook it into the 5V line. The electical potential between these two lines is 7V. Basically this is what that 'adapter' is doing.
Whoa, that's a pretty neat idea!

Sorry, OP, that was a detail about pumps I didn't know about and also what leads are in the adapters. Now I know! ;D Thanks Seeing Red!
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post #26 of 32
Thread Starter 
Which do I move around then? IF I want to try it?

Should I put each pump on it's own 'rail'? My 1000HX Corsair has multiple rails.

The pumps also reside in the new Koolance RP-452x2 reservoirs.
post #27 of 32
Quote:
Originally Posted by vivithemage View Post
Which do I move around then? IF I want to try it?

Should I put each pump on it's own 'rail'? My 1000HX Corsair has multiple rails.

The pumps also reside in the new Koolance RP-452x2 reservoirs.
Yeah, each pump would get the "modded" adapters where the ground lead is switched with the 5 volt lead position. This will supply the pumps 7 volts.

Check out sleeving tutorials there are guides to removing the leads. I believe.. if my memory is correct, that there's a pin or a thing you push inside the molex adapter with a small flathead screwdriver to unlock it and then you simply pull it out.
Edited by dcyli - 3/29/11 at 1:06pm
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post #28 of 32
Thread Starter 
hrrm, I have been looking, I don't see this thread about modding the adapter?

I got a reply from swiftech if this lil adapter would work :


Quote:
Not really, there's too much current. You need specialized controller.
We do not offer it. Suggesting research on various forums in that
respect.
basically no...
post #29 of 32
Quote:
Originally Posted by vivithemage View Post
hrrm, I have been looking, I don't see this thread about modding the adapter?

I got a reply from swiftech if this lil adapter would work :




basically no...
Well, no vendor/manufacturer is going to condone modification of their product. Mostly because of voiding the warranty and possibly to get you to spend more on a Variable speed pump.

BUT: I decided to check up on the operation voltage through Laing (original pump manufacturer) and it you will not be able to run it on 7V anyways. The voltage needed is at least 8V. Sorry, this was my fault leading you on a wild goose chase by going by unreliable info.

Though it might just be a vibration issue rather than a pump speed one. Can you describe how the pumps are mounted?
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post #30 of 32
Thread Starter 
I am just preparing for them, I just heard they are a bit louder, I have one pump, waiting on my second for my koolance res.
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