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Old 9th November 2007, 08:38 AM   #1
zouwi is offline zouwi  Finland
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Join Date: Aug 2005
Default diy active di-box

I would like to build a phantom powered di-box, but I can't find any good schematics anywhere. I have made a few of these but they can't give out more than levels of -10dBu. Also, they blow the tranny if accedentially +48V gets shorted to gnd. Good things with those are that they sound quite good and they have SNR of about -120dB.

I would very much appreciate if someone had some other schematics to good di-boxes. They must be phantom powered active and it must be possible to get gnd-lift to them. Also, if someone has any commercial box's schematics, it would be really interesting to have a look at them.
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Old 9th November 2007, 09:36 AM   #2
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Join Date: Mar 2007
You could try this: http://sound.westhost.com/project35.htm

I haven't used it, but Elliott's designs are generally sound.
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Old 10th November 2007, 01:36 AM   #3
fdeck is offline fdeck  United States
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Join Date: Feb 2006
Location: Wisconsin
Check out the Jensen Transformer website. There is a page with schematics for various applications, including passive and active direct boxes.
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Old 10th November 2007, 01:50 AM   #4
gibong is offline gibong  Canada
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Join Date: Dec 2004
Location: Vancouver BC
I've built Bo Hansen's DI box:
http://web.telia.com/~u31617586/#act...%20from%201975

Check out the others on that page too (the API DI mod looks nice).
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