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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th April 2010, 04:54 PM   #31
sendler is offline sendler  United States
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Location: ny
Default I like the sound of batteries

I like the sound of batteries at 25v. It is a little better than a Meanwell at 32v but more inconvenient and no cheaper so I am sticking with the SMPS. I don't know if the batteries will hold up as well when charging in series. Many people using lead/ gel batteries listen in series and charge in parallel due to the readily available 12v chargers.
.

Quote:
Originally Posted by Nick122147 View Post
I'm thinking of trying battery power. Would two batteries like this be ok? Can I charge them also in series with a 24V charger?

12V7AHƿ 12V7AH άʽǦ-Ա

translated specs:

Battery 12V7.0Ah/20hr
Rated Voltage: 12V
Rated Capacity (20hr): 7Ah
Dimensions: Length: 151mm Width: 66mm high: 96mm Total height: 102mm
Reference Weight: about 2.8Kg
Actual capacity of different discharge rate
20 hours rate: 7Ah
10-hour rate: 6.5Ah
5 hour rate: 5.9Ah
1 hour rate: 4.2Ah
15-minute rate: 2.9Ah
The relationship between volume and temperature (20 hour rate)
40 ℃ (104 ℉): 103%
25 ℃ (77 ℉): 100%
0 ℃ (32 ℉): 86%
-15 ℃ (5 ℉): 65%
At 25 ℃ (77 ℉) resistance when fully charged: about 22mΩ
Charging method (constant voltage)
Cycle: the maximum charge current of 1.75A
Charging voltage 14.5-15.0V/12V77 ℉ (25 ℃)
Charge temperature compensation voltage-24mV / ℃
Float: Maximum charging current 1.75A
Charging voltage 13.6-13.8V/12V77 ℉ (25 ℃)
Charge temperature compensation voltage-18mV / ℃
Apply to electronic scales, emergency lights, children's toy cars, lawn, parking locks, power systems, access control systems, uninterruptible power supplies, etc.
__________________
Scott
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Old 26th April 2010, 02:44 AM   #32
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Would it work using 2x12V batteries and 1 x6V to get 30V? Or 5X6V batteries? But how could I charge them?

Last edited by Nick122147; 26th April 2010 at 02:51 AM.
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Old 26th April 2010, 06:25 AM   #33
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Call me lazy (or stupid) but I've never done DIY stuff (want to but don't know where to start & how to begin), so I just want to know if you can buy an out-of-the-box-ready amplifier with these boards?

Are these the same boards that Virtue Audio uses in their Virtue Two's?
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Old 26th April 2010, 10:35 AM   #34
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Quote:
Originally Posted by Geopoliticus View Post
Call me lazy (or stupid) but I've never done DIY stuff (want to but don't know where to start & how to begin), so I just want to know if you can buy an out-of-the-box-ready amplifier with these boards?

Are these the same boards that Virtue Audio uses in their Virtue Two's?
What about the Red Wine Audio's Signature 30?
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Old 26th April 2010, 06:09 PM   #35
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Quote:
Originally Posted by Nick122147 View Post
What about the Red Wine Audio's Signature 30?
At 2.795,00 I'm afraid it's way too expensive.
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Old 27th April 2010, 12:15 AM   #36
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Default Dayton DTA-100

You might want to take a look at the new Dayton unit here, which uses the TK2050. Parts Express started selling them a month ago.

EDIT: If the link above doesn't work, try this one: http://www.parts-express.com/pe/show...number=300-383

Last edited by SoldierAnt76; 27th April 2010 at 12:21 AM. Reason: Broken Link
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Old 27th April 2010, 01:11 AM   #37
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On topic:
How did you order your amp to NJ? And how much did it end up costing, all told?

Off Topic:
Quote:
Originally Posted by sendler View Post
Many people using lead/ gel batteries listen in series and charge in parallel due to the readily available 12v chargers.
.
How is this typically set up? I've been wrestling with how to accomplish this very thing for my 6ch TK2050 HT power amp. I have the batteries, and all the 12V wall warts I could ever need.
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Old 27th April 2010, 12:03 PM   #38
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I picked up two 12V7ah Panasonic "Valve regulated lead-acid batteries" yesterday and a charger (originally for electric bikes i think). I will experince more back and forth before I make any conclution about the benefits of the batteries. I also connected the DAC to the 24V batteries, and I think that made a bigger difference. I have a 707 Super USB dac, and the sound was clearer and deeper color in a way with the batteries. But, as written, I have to experience with the meanwell and the batteries to decide how big difference I can tell from the meanwell to the batteries on the 2050.
I did also change the input caps some days ago to mcap MKP, and there might have been a small change for the better, but I felt at this point my room is making it difficult to hear this subtle differences. So I put up two blankets on the wall (looks great and the difference was much bigger than changing the cap.

The 24V charger i got for the batteries makes a awfull loud bzzz sound. The seller checked it and said it was normal. But the sound is very annoying. What causes this sound from a charger? Anything I can do to make it better? I might look for another charger if I will continue using the batteries, but havn't seen that many 24V chargers.
I havn't much experience with batteries. When should I charge them? When there is no more sound, or when the voltage drops below a certain point?


Quote:
How is this typically set up? I've been wrestling with how to accomplish this very thing for my 6ch TK2050 HT power amp. I have the batteries, and all the 12V wall warts I could ever need.
You connected them + to + and - to - for charge in paralell with 24V charger. So have to reconnect + to - for listening at 24V. I bit too much hassle for everyday use once the initual please of getting some new stuff decreases.
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Old 27th April 2010, 12:23 PM   #39
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The charger will probably be putting out about 27.6V so that it is safe to use as a float charger. It is worth checking the charge voltage with a meter when it is charging the batteries. I suggest you don't let the batteries drop below 22V under load as this will reduce the battery life. I am very familiar with this size of SLA battery as I use both Panasonic and Yuasa branded ones at work as standby battery suppies.
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Old 27th April 2010, 12:45 PM   #40
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Quote:
Originally Posted by Ouroboros View Post
The charger will probably be putting out about 27.6V so that it is safe to use as a float charger. It is worth checking the charge voltage with a meter when it is charging the batteries. I suggest you don't let the batteries drop below 22V under load as this will reduce the battery life. I am very familiar with this size of SLA battery as I use both Panasonic and Yuasa branded ones at work as standby battery suppies.
When I connected the charger I first measured around 25V. Then it was gradually increasing. After about 2 hours I measured 30V. Is that way too much?
I only charged about 2 hours today. and I measured just above 26V after deplugging the charger.
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