Found some inexpensive & compact, regulated 12vdc psu's (for T-amp's etc) - diyAudio
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Old 16th November 2005, 08:28 PM   #1
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Default Found some inexpensive & compact, regulated 12vdc psu's (for T-amp's etc)

HI all, i figured i'd give back to the DIYaudio community and share my findings. If anybody has ever tried hunting for this type of psu you would have noticed two things: they're not cheap and they're usually not regulated. Most of the cheaper ones on ebay are the switching type, whose voltages can supposedly stray as high as 18v, not good for tripath chips or sensitive circuitry in my estimation.

Well enough blah blah, here are some of the more interesting ones i found:

12vdc 3a regulated, center + tip $7.95 / 3 for $6.67 each: http://www.bgmicro.com/prodinfo.asp?...1&cri=&stype=1
12vdc 3a regulated, center + tip $7.95 / 3 for $6.67 each: http://www.bgmicro.com/prodinfo.asp?...WR1207&stype=3
12vdc 1.5a regulated, center + tip $6.95: http://www.bgmicro.com/prodinfo.asp?...ri=PWR&stype=2
9 more pages of psu's to sift through: http://www.bgmicro.com/search1.asp?p...ri=PWR&stype=2

Now i realize these may not work as well as a rigged sla battery, but i figured some may appreciate the "easy factor" in going with these regulated units. I also like the store, BGmicro seems to carry a lot of rarer gizmo's.

enjoy,

Steve
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Old 16th November 2005, 08:58 PM   #2
johnnyx is offline johnnyx  United Kingdom
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They are switching types, although it doesn't say so specifically. The "universal input voltage, 100-240vac" is a give-away. There isn't a transformer that has a universal input voltage, unfortunately.
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Old 16th November 2005, 09:11 PM   #3
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Quote:
Originally posted by johnnyx
They are switching types, although it doesn't say so specifically. The "universal input voltage, 100-240vac" is a give-away. There isn't a transformer that has a universal input voltage, unfortunately.
The devil is in the details unfortunately, and thank you for that insight.

Does anybody know of any notable differences between these regulated "switching" and the non-regulated type? I'm guessing these maintain their output voltage better than the non-regulated variety but i can't think of much else (?)
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Old 16th November 2005, 11:50 PM   #4
Pano is offline Pano  United States
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Nice find Steve! And they are cheap! Cheap!

Yes, they are switching type PSUs. Some of the guys on this board like a swicthing PSU better than linear for the Tripath. At that price, it's worth a listen, yeah?

The down side to Switch mode PSUs is that they can kick a lot of trash back into your AC lines. That could get into other gear and make it sound bad. You can filter a lot of it out, but that means time and money.

Worth a look-see, for sure!
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Old 17th November 2005, 12:01 PM   #5
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Is there a thread/wiki/faq or something I could look into about Tripath?

Seems like a good solution for HTPCs with built-in amplification. I was looking into UcD180 for that but it's too expensive, and hard to do with SPMS
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Old 22nd November 2005, 06:14 AM   #6
Hardman is offline Hardman  United States
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Here is a link to some 12 volt power supplies I found too...

http://www.apexjr.com/new.htm (scroll down the page, power supplies are found towards the bottom).

Text from the web site... (see picture too)

Switching power supplys 100- 240V input on all
1st is a 6 1/2" X 2 1/2" 12Vdc 2 1/2Amps $7.95ea
Middle 8 1/4" X 3 3/4" 5Vdc 5A, 12V 2.5A and a -12V .5A 3.95ea
Last 10" X 2 1/2" 12Vdc 6.3Anp $12.50ea
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File Type: jpg 12 volt power supplies.jpg (62.5 KB, 391 views)
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Old 24th November 2005, 12:22 AM   #7
Pano is offline Pano  United States
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I just got 2 of these from BG Micro, the DVE and the Part II.

At 1st glance, the DVE seems less noisy, but I will test both with an amp to see/hear.

Too bad they don't put out 13.5 volts. That would be ideal.
FWIW, the DVE seems to switch at 62.5 kHz, well out of the audio band. Might be easy to clean up.
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Old 24th November 2005, 07:45 PM   #8
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Heh.. I think that properly tuned ATX PSU is MUCH better. Or, at lest, much powerfull.
Say, dead ATX PSU cost $0. Add $1-2 for repairing and optional $100 for tuning and tweaking and you will have very good PSU for small T-amps.
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Old 29th November 2005, 03:20 AM   #9
Hara is offline Hara  United States
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Another possibility...

http://www.allelectronics.com/cgi-bi...231&type=store

I believe the T-Amp uses a 2.1 mm jack so you might need an adaptor etc.

How does this one fair?

http://www.partsexpress.com/pe/showd...number=120-532

I'm not sure if that one is a SMPS though... it's also more expensive.

I myself haven't decided on which PS to use. I need two, one for a t-amp and for the charlize i'll order. It should also be able to go to 13.8 like mentioned above, for optimal performance.
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