Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th January 2009, 08:06 PM   #1
jman 31 is offline jman 31  United States
diyAudio Member
 
jman 31's Avatar
 
Join Date: Oct 2008
Location: Florida
Default DI Box?

Hey guys I have a question regarding DI Boxes. I have been reading that in order to make a recording quality DI Box that a Jensen transformer in the order of $70.00 usd would be the way to go.

I am not looking to go through a snake with my guitars or anything. I primarily just want to go from an unbalanced guitar jack to a balanced XLR jack. Is there a cheaper solution that would give me the same quality? Is there a simple way to achieve this without the transformer?

I would also need to take into account the impedance issues because I want to go into the mic input on a mixing board.

Thanks
Jeremy
  Reply With Quote
Old 15th January 2009, 09:51 PM   #2
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Just buy an active DI - they sound excellent, and match far better than a transformer - transformer 1Meg input, 600 ohm output?, I don't think so

I use cheap Behringer twin DI boxes, I've used them on bass and guitar, both passive and active, and everytime they sound really great.

As far as I'm concerned the only advantage of a transformer is that it provides a true break for earth loops, but that doesn't apply for a guitar anyway.
__________________
Nigel Goodwin
  Reply With Quote
Old 15th January 2009, 10:39 PM   #3
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
You can make an active DI pretty easy useing a Fet Opamp buffer and a DRV134 Ballanced line driver chip or simular...

Cheers
  Reply With Quote
Old 15th January 2009, 11:51 PM   #4
jman 31 is offline jman 31  United States
diyAudio Member
 
jman 31's Avatar
 
Join Date: Oct 2008
Location: Florida
Quote:
Originally posted by Nigel Goodwin
Just buy an active DI - they sound excellent, and match far better than a transformer - transformer 1Meg input, 600 ohm output?, I don't think so

I use cheap Behringer twin DI boxes, I've used them on bass and guitar, both passive and active, and everytime they sound really great.

As far as I'm concerned the only advantage of a transformer is that it provides a true break for earth loops, but that doesn't apply for a guitar anyway.
I will look into those. I really would like it to run on phantom power if I use an active DI. I need to check if that is one of their options.

Minion, I don't know the ins and outs of designing circuitry. Have you seen a schematic for one that is good enough to use for a recording studio?

Jman
  Reply With Quote
Old 16th January 2009, 11:40 AM   #5
jman 31 is offline jman 31  United States
diyAudio Member
 
jman 31's Avatar
 
Join Date: Oct 2008
Location: Florida
What do you guys think about this circuit? It's an active, phantom powered DI box that has an in and an out. Will it be quiet enough to record with?

I also found this one but it is not phantom powered.
http://www.diyfactory.com/projects/c...ountryhick.htm

Thanks
Jman
Attached Images
File Type: jpg phantom powered di box.jpg (17.1 KB, 164 views)
  Reply With Quote
Old 16th January 2009, 08:20 PM   #6
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally posted by jman 31

I will look into those. I really would like it to run on phantom power if I use an active DI. I need to check if that is one of their options.
The Behringer I use can be powered by a 9V battery, or by phantom power from the mixer. It's the DI20, twin channel, I've found them invaluble (I even bought a second one as I liked it so much ). Only 20, not worth messing about building one.

http://www.bluearan.co.uk/index.php?...&img_name=DI20

Everyone should have one in their bag!.

As for the single transistor circuit, it's really pretty naff - it isn't going to be very good quality.
__________________
Nigel Goodwin
  Reply With Quote
Old 16th January 2009, 08:51 PM   #7
jman 31 is offline jman 31  United States
diyAudio Member
 
jman 31's Avatar
 
Join Date: Oct 2008
Location: Florida
Quote:
Originally posted by Nigel Goodwin


The Behringer I use can be powered by a 9V battery, or by phantom power from the mixer. It's the DI20, twin channel, I've found them invaluble (I even bought a second one as I liked it so much ). Only 20, not worth messing about building one.

http://www.bluearan.co.uk/index.php?...&img_name=DI20

Everyone should have one in their bag!.

As for the single transistor circuit, it's really pretty naff - it isn't going to be very good quality.

Thanks man. I will probably go that route. I like doing diy projects, but this one wasn't really grabbing my attention anyways. I appreciate your time.

Jman
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 03:04 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2