B&O 1000asp amplifiers

[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.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.

[cyril_hk]

http://www.icepower.bang-olufsen.com...ker/ASP_SERIES

[lazenna]

Yes Cyril they are the one's.

[cyril_hk]

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

[Nisbeth]

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.

[lazenna]

Do you know of any simple small circuits that I would be able to use.Thx

[lazenna]

What does the Lundahl transformer do?

[cyril_hk]

That is a input transformer
http://www.lundahl.se/pdfs/datash/7901_02.pdf

[h_a]

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