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advice needed on an impedance/level adapter
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al219



Joined: Apr 13, 2004
Posts: 11

G2 patch files: 1

PostPosted: Wed Nov 18, 2009 5:52 am    Post subject: advice needed on an impedance/level adapter Reply with quote  Mark this post and the followings unread

Hello, I have to build a line to instrument impedance/level converter: input balanced 500 ohm +4 db, output unbalanced 50 kohm -10 db.
I’ve found several schematics using an audio transformer and some resistors, but I’m bit confused now, because there are completely different approaches to the same issue.
I saw two examples using a 600:600 transformer, one using an upstep transformer and another a downstep one. Some put the voltage reduction resistors network before the tranny, others after it.

Nydave 10k:150
http://www.ultimatemetal.com/forum/equipment/459195-50-d-i-y-reamp-box.html#post7948794

Recording magazine: 600:600
http://www.recordingmag.com/resources/resourceDetail/314.html

Jensen: they propose a 600:600 tranny, but sell also the upstep ones.
http://www.jensen-transformers.com/as/as092.pdf

Reamp schematics 500: 50k (the patent..I mean, just to get inspiration..)
http://www.google.com/patents?id=PqkXAAAAEBAJ&printsec=drawing&zoom=4#v=onepage&q=&f=false

My personal opinion is that the correct approach would be the reamp one.
Any suggestion/comment?

Thank you in advance
Alberto
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