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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th May 2010, 05:49 PM   #101
sendler is offline sendler  United States
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Default Missed it by that much

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Originally Posted by noj91 View Post
Tempted Scott? Have a go way better than my stock sure 4x100
I just received 10 of the 2X100 modules and 36v power supplies last month so I am already committed. I do like the passive cooling and on board pop delay relay and the real quality input caps. The pot wouldn't help any active cross users but is great for most people with passive speakers though I would recommend listening to a lower value of 10k to compare. It would also be fun to compare a Meanwell S-350-36 power supply to an AC transformer supply. My money is on the SMPS.
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Old 14th May 2010, 06:16 PM   #102
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Originally Posted by sendler View Post
It would also be fun to compare a Meanwell S-350-36 power supply to an AC transformer supply. My money is on the SMPS.
Why? Not that I favor AC over DC; I'm just curious . . .
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Old 14th May 2010, 07:39 PM   #103
sendler is offline sendler  United States
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Originally Posted by SoldierAnt76 View Post
Why? Not that I favor AC over DC; I'm just curious . . .
When I first got my Sure amp I ran it from one leg of the big linear supply that I had been using for all of my AB amps over the years. I liked the TK2050 enough to want another one so I also ordered a MeanWell SMPS and was very surprised to hear that it sounded much better than the linear supply.
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Old 14th May 2010, 09:51 PM   #104
teamacc is offline teamacc  Netherlands
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Was it the extra voltage, of was it the fact that the smps keeps the voltage more stable under loads?
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Old 15th May 2010, 01:10 AM   #105
sendler is offline sendler  United States
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Was it the extra voltage, of was it the fact that the smps keeps the voltage more stable under loads?
The voltage was about the same at 32v.
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Old 17th May 2010, 02:44 AM   #106
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Originally Posted by sendler View Post
The voltage was about the same at 32v.
Hi Scott,

I thought the S-350-36 supposed to outputting 36V, instead of 32V?

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Old 17th May 2010, 03:15 AM   #107
sendler is offline sendler  United States
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Originally Posted by dw1narso View Post
Hi Scott,

I thought the S-350-36 supposed to outputting 36V, instead of 32V?

Regards,
---
David
The MeanWell supplies are adjustable and the Sure amp has the values of the feedback resistors optimized for 32v so I turn the supply down. The linear supply was closer to 33v.
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Old 17th May 2010, 06:52 AM   #108
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I see... thanks Scott...
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Old 17th May 2010, 09:33 AM   #109
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Originally Posted by SoldierAnt76 View Post
I saw earlier that this board takes AC as well as DC. What are the power requirements (e.g., what sort of transformer would it need)?
Hifimediy told me 12-24VAC. Does that sound right? He said DC range is 20-36V. I thought I had read somewhere that AC is * 1.4 when rectified into DC. so that would make 12-24VAC 16.8V-33.6
The amp would draw 6-7A at 30VDC if run at full power (2*100W). So would anybody know how big ampere 24V transformer would be needed to run 2*100W?
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Old 17th May 2010, 11:08 AM   #110
sendler is offline sendler  United States
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Originally Posted by Nick122147 View Post
Hifimediy told me 12-24VAC. Does that sound right? He said DC range is 20-36V. I thought I had read somewhere that AC is * 1.4 when rectified into DC. so that would make 12-24VAC 16.8V-33.6
The amp would draw 6-7A at 30VDC if run at full power (2*100W). So would anybody know how big ampere 24V transformer would be needed to run 2*100W?
33 volts*7 amps = 230 VA at least. Now your transformer alone will cost more than a 9 amp MeanWell SMPS. I have never seen my amps average more than .35 amps of current consumption when playing though.
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