diy active di-box

zouwi · 9th November 2007, 08:38 AM

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.

error401 · 9th November 2007, 09:36 AM

You could try this: http://sound.westhost.com/project35.htm

I haven't used it, but Elliott's designs are generally sound.

fdeck · 10th November 2007, 01:36 AM

Check out the Jensen Transformer website. There is a page with schematics for various applications, including passive and active direct boxes.

gibong · 10th November 2007, 01:50 AM

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).

9th November 2007, 08:38 AM	#1
zouwi diyAudio Member Join Date: Aug 2005	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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9th November 2007, 09:36 AM	#2
error401 diyAudio Member 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.

10th November 2007, 01:36 AM	#3
fdeck diyAudio Member 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.

10th November 2007, 01:50 AM	#4
gibong diyAudio Member 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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