Looking for high Quility Guitar DI Schematic with line throu

[Nuuk]

I'm searching for a schematic for a Di box where I can plug in a guitar, connect it to an amp and to my mixer.
The point is, that the signal that comes in from the guitar has to be exactly the same that the signal that goes out to the amp.
Does anyone have a schematic for such a DI? As I know a lot of DIs don't do that job very well.

 

[gyraf]

Hi Nuuk,

Welcome to GroupDIY!

I think what you're looking for is a combined splitter/linedriver:

http://www.groupdiy.com/index.php?topic=6619

The one I suggest will have minimal influence on the signal going from instrument to amplifier.

Jakob E.

 

[Nuuk]

[quote author="gyraf"]
I think what you're looking for is a combined splitter/linedriver:
.[/quote]

Yeah, a splitter with DI out.
will check out your link.
thanks for the fast answer

i'm not sure if kubi's link does exactly what i want it to.

 

[Nuuk]

kubi:
does that bo hansen DI really put out the same signal that comes in?
my electronic skills are not good enough to check this out myself. :roll:
if it does this would probably be the way to go.

 

[soundguy]

theres a schematic for a tube DI on the jensen site that is nice.

dave

 

[CJ]

Are you SURE that you want the signal going to the board to be the same?

I built a DI box that clips onto your speaker leads. Just two resistors in series as a voltage divider with a transformer primary across one of the resistors. Secondary out to the board, bi-atch!

I'm out.

 

[moosapotamus]

I built a pair of Bo's DI boxes with Lundahls. They rock! They do exactly what Nuuk's original post asked. Plus, they are dead quiet.

~ Charlie

 

[Nuuk]

yes, i'm sure i want the signal to be the same. I don't want to change the sound, i just want to also record the direct signal.
thanks, then i will try bo's di.

 

[BYacey]

Another you might want to try is the Country Hick DI, you can find it somewhere here by doing a search.

 

[Nuuk]

Well, the first problem allready occured before building.
is there any substitute for the lundahl used in the bo hansen? the lundahls aren't easy to get here in germany.

 

[Guest]

[quote author="Nuuk"]Well, the first problem allready occured before building.
is there any substitute for the lundahl used in the bo hansen? the lundahls aren't easy to get here in germany.[/quote]
Via Bo's reply to one of my questions...
Regarding transformer,
The best choice quality/price are Lundahl LL-1538 (or LL-1538XL for higher level) in 5:1 configuration.
Try also older second hand microphone transformers as UTC, Triad, Sescom, Altec, OP-Amp Labs that have a ratio around 1:5 to 1:10, because they can have a nice sound for a base or synth DI application.
http://www.groupdiy.com/index.php?topic=10390&highlight=try+older+second+hand+microphone+transformers+utc#10390

BTW read the whole thread.. PCB layouts in there and parts lists

 

[jensenmann]

Lundahl trannies are easy to get in germany:
www.jacmusic.com is the german distributer.
Another source is www.canford.de but they are a little more expensive.

:sam:
Jens

 

[nacho459]

[quote author="Nuuk"]The point is, that the signal that comes in from the guitar has to be exactly the same that the signal that goes out to the amp.[/quote]

Isn't that what most DI boxes do? don't they just wye the two inputs together so you get the same thing coming in from the instrument as is going out to the amp? Am I missing something here, or does something down the line in the balanced mic level output color the sound of the inputs? I've never noticed an amp sounding different once I put a DI in front of it.

 

[pmroz]

.
Nacho, i guess trafos might 'color' it in the balanced (lo-z) out channel. Seems the potential to 'change' the sound is there. The front of the DI lo-z tap (trafo or whatever) might have to figure in to the equation, as loading on the input...? From what limited I've read, hi-z is important to passing the tone intact.
... but smarter guys than me are everywhere, I'm only learning myself. I bet Bo's threads address this, hadn't looked at them as I need a slightly different guitar thingy.
Paul

 

[Gus]

read my post in this thread

http://www.groupdiy.com/index.php?topic=6619

 

[Nuuk]

I just built Bo's DI.
How high should the resistance between pin 2 and pin 3 of the XLR output be? I'm afraid to kill the phantom power of my mixer.
I measure 31 Ohm here, and i think that's pretty low??
Maybe I did something wrong?

 

[Nuuk]

Could somebody please tell me, if this 31 Ohm sounds ok, or if it is too low?

 

[jensenmann]

You are measuring the DC resistance of your output tranny. 31Ohm looks ok. But now you have a magnetized the core of your iron with the DC measuring current of your DMM. Connect a tonegenerator at 20Hz 1V to it and slowly decrease the Voltage to zero. This will demagnetize the core again.
Your board`s Phantom power is send via pin 2 and 3 to the DI. This means it cancels itself at the trannies input since both connectors of the trx are on the same potential. No DC current will flow.
:sam:
Jens

 

[Nuuk]

[quote author="jensenmann"]You are measuring the DC resistance of your output tranny. 31Ohm looks ok. But now you have a magnetized the core of your iron with the DC measuring current of your DMM. Connect a tonegenerator at 20Hz 1V to it and slowly decrease the Voltage to zero. This will demagnetize the core again.
Your board`s Phantom power is send via pin 2 and 3 to the DI. This means it cancels itself at the trannies input since both connectors of the trx are on the same potential. No DC current will flow.
:sam:
Jens[/quote]

I connected a tone generator to pin 2 and 3 and did what you told me.
I connect the di to a guitar amp, to try it out. but i had a humming noise. my guitarist told me, that this happens with most di boxes. when i connect the di to a input of my mixer, it works fine.
did anyone have the same problems with the di? is there anything i could do to fix this?

 

[Nuuk]

Did anybode use this DI with a guitar and a guitar amp? did it work as it should? or did you also have noise?