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Old 1st February 2005, 07:43 PM   #1
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Default XLR modification

I wish to modify my preamp to provide XLR outputs.

the only problem i have is i have no idea how to do it!!

Does anyone have any ideas?

I would need some basic instructions...preferably in crayon!

Thanks

Peter
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Old 1st February 2005, 08:09 PM   #2
phn is offline phn  Sweden
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What, you want to go balanced? Try this link for very basic information. But if you want to balance your system, that's for the more knowledgeable guys here.
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Old 1st February 2005, 08:15 PM   #3
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What do you want to drive? There are several ways of doing this, some easier than others.
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Old 2nd February 2005, 05:56 PM   #4
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I have an RB-970bx preamp and a Rotel RB-991 power amp with pretty XLRs on the back...does that help?
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Old 2nd February 2005, 05:56 PM   #5
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I have checked the link phn. Interesting but unfortunatly it is about making the wires. I need to make the socket and manufacture something that will reverse the phase of one channel!!
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Old 2nd February 2005, 06:08 PM   #6
joensd is offline joensd  Germany
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Hi,
hereŽs one simple way to do it with an opamp.
(YouŽd only need the transmitter in figure1)
http://sound.westhost.com/project51.htm

You could also have a look at the BOSOZ from Nelson Pass but then you could omit your whole preamp. (nice article(s) anyway)
http://www.passdiy.com/legacy.htm
(balanced zen line stage; which is a class a preamplifier)

greets
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Old 2nd February 2005, 06:11 PM   #7
Netlist is offline Netlist  Belgium
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Have a look at Rod Elliott's pages: http://sound.westhost.com/
Under Projects->Preamps and Accessories.

/Hugo
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Old 2nd February 2005, 06:25 PM   #8
phn is offline phn  Sweden
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"Crayon" kind of threw me. At least the other guys here dug up some interesting stuff. They always do.
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Old 2nd February 2005, 07:42 PM   #9
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Judging by the tone of your post, it sounds like what is the easiest way to do it would suit your needs best.

So, IMO, forget individual op amps and discrete designs and use a single chip solution like the DRV134. This is from the datasheet:
Attached Images
File Type: jpg drv134.jpg (41.5 KB, 400 views)
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Old 2nd February 2005, 08:49 PM   #10
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Hmmm the advice i was looking for was:

Buy this circuit board.

Solder the wires here, here AND here...not there though that would be silly.

Connect the power to the unit HERE and HERE.

turn on enjoy!

Could anyone offer advice on that level.

Sorry for sounding stupid, but lets face it I need lots of help!
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