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Any way to reduce high pitch whine on MCP350? - Page 5

post #41 of 55
^^ooh, I know I'll be waiting anxiously.
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post #42 of 55
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post
FYI,
I'm in the process of testing the Sanyo DIYINHK PCB mod for the DDC1, and I think it makes a really big difference in noise improvements. I'm having a hard time measuring noise during the day (will have to wait until silence at night), so I'm thinking it'll have a similar noise response to the Laing DDC3 series.

He has a Toshiba and a Sanyo controller. The Toshiba is king of power and has a variable speed controller, but the Sanyo is going to be king of low noise I'm sure. It should be really similar to a DDC3.1 or DDC3.15 would be my subjective guess.

This is the quiet Sanyo version:
http://cgi.ebay.com/Laing-DDC-water-...#ht_876wt_1139
Would 2 of those reduce the noise you think? How hard would it be to throw em on?
post #43 of 55
I think so, the Sanyo controller is nice for noise, but give me a chance to try some noise testing and a chance to try soldering in one myself. Hope to do that this weekend..
    
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post #44 of 55
Thread Starter 
Let me know if the high pitched noise goes away...that is key, haha.

I was told it could be because of the larger impellers they used?
post #45 of 55
It's definitely an improvement on noise over the Laing DDC1 controller.

Doing a quick and dirty test, not even apples to oranges. The DDC1 had an old PTS acetal top, the Sanyo had and acrylic top.

Ambient = 35.5 dbA
Ambient + DDC1 = 41.7dbA (+6.2dbA)
Ambient + DDC1 with DIYINHK Sanyo PCB = 38.1 (+2.6dbA)

I'll have to do a more apples to apples video recording type of test in an actual loop, but the Sanyo controller does appear to be a fair amount better in my quicky and per my subjective ear.
    
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post #46 of 55
That's still pretty darn loud.
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post #47 of 55
Quote:
Originally Posted by tsm106 View Post
That's still pretty darn loud.
Not really, +3dbA is considered barely perceptible. In my testing of pumps I have yet to find one that doesn't increase noise at least 2-3dbA.

Don't compare actual noise levels to fan specs. Fan specs are notorious for giving a false sense of what loudness is. A single Gentle Typhoon AP-15 fan mounted to a radiator raises noise levels from 31dbA to 46dbA (+15), so 2-3dbA is pretty minor IMO.
Edited by Martinm210 - 4/15/11 at 10:28pm
    
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post #48 of 55
Quote:
Originally Posted by Martinm210 View Post
Not really, +3dbA is considered barely perceptible. In my testing of pumps I have yet to find one that doesn't increase noise at least 2-3dbA.

Don't compare actual noise levels to fan specs. Fan specs are notorious for giving a false sense of what loudness is. A single Gentle Typhoon AP-15 fan mounted to a radiator raises noise levels from 31dbA to 46dbA (+15), so 2-3dbA is pretty minor IMO.
I don't know what your ambients were for your graph, but if I assume them to be similar to this test...? Were the graph ambients 31? Either way the max dba is 41 in both cases, so it still is a bit of a gap or am I reading it wrong? It's a bit higher than a 3.25, but on the other hand it did drop a hecuva lot from just a DD1. That's a positive no doubt.
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post #49 of 55
Quote:
Originally Posted by tsm106 View Post
I don't know what your ambients were for your graph, but if I assume them to be similar to this test...? Were the graph ambients 31? Either way the max dba is 41 in both cases, so it still is a bit of a gap or am I reading it wrong? It's a bit higher than a 3.25, but on the other hand it did drop a hecuva lot from just a DD1. That's a positive no doubt.
They were different ambients, ambients for the graph were dead silent hitting meter lower limit at 31dbA.

I'll have to get that noise bench setup again to do the same sort of test.
    
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post #50 of 55
Thread Starter 
Thanks for testing martin, how was the high pitch whine?
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