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Old 29th November 2008, 10:04 AM   #1
lazenna is offline lazenna  Australia
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Default B&O 1000asp amplifiers

Hello diy'ers.I wonder if anyone can tell me whether these modules from B&O can just be wired up to the appropriate connectors and used.I notice that on some of the commercially available equivalents eg:JeffRowland 501 and some others that even to put a led on the front panel they have some type of circuitry.
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Old 30th November 2008, 02:08 AM   #2
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Default This one?

http://www.icepower.bang-olufsen.com...ker/ASP_SERIES
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Old 30th November 2008, 09:59 AM   #3
lazenna is offline lazenna  Australia
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Yes Cyril they are the one's.
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Old 30th November 2008, 11:16 AM   #4
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Here the data sheet...
http://www.icepower.bang-olufsen.com...000aspdata.pdf

and from what the photos can tell, yes you have every connectors you need on the module. it even came with it own switching psu!
http://magusmax.pixnet.net/blog/post/21653083
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Old 30th November 2008, 08:14 PM   #5
Nisbeth is offline Nisbeth  Denmark
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Default Re: B&O 1000asp amplifiers

Quote:
Originally posted by lazenna
Hello diy'ers.I wonder if anyone can tell me whether these modules from B&O can just be wired up to the appropriate connectors and used.
In a word, yes. The problems are that the input impedance is a low-ish 8kOhm which some preamps may not like and that the gain is only 27dB meaning they require quite a lot of voltage for full power compare to other amps. Most of the commercially available amps will use input circuitry to raise the input impedance to around 50kOhm and provide a bit of extra gain as well.

/U.
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Old 1st December 2008, 05:32 AM   #6
lazenna is offline lazenna  Australia
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Do you know of any simple small circuits that I would be able to use.Thx
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Old 1st December 2008, 10:35 AM   #7
lazenna is offline lazenna  Australia
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What does the Lundahl transformer do?
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Old 1st December 2008, 11:40 AM   #8
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That is a input transformer
http://www.lundahl.se/pdfs/datash/7901_02.pdf
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Old 1st December 2008, 02:58 PM   #9
h_a is offline h_a  Europe
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8k is a nice input impedance and not a problem for solid-state preamps. Nothing wrong with that, why put some jfet follower in front to get it higher?

Have fun, Hannes
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