line level unbalanced to balanced converter - Page 2 - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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
Thread Tools Search this Thread
Old 2nd June 2011, 07:44 PM   #11
diyAudio Member
Join Date: Jun 2011
Hey! First off I'm new to the forum. I've been getting into DIY stuff a lot lately and it just seemed that almost every time I looked something up at least a few of my top results were from this forum. Anyways, I need help. I've started constructing my own guitar amps for fun. I've started mostly with converting older organs, radios etc. for the sake of inexpensiveness and simplicity for I am still learning. The problem I've run into this problem multiple times now is this: My instrument signal is too weak for the majority of the units I'm working with. The few projects I have successfully completed or converted either already had a 1/4 inch input or I completely replaced most of the power-amp and preamp sections with older guitar practice amps. I need something that's passive, simple, cheap and compact. I will be using this design repeatedly so those 4 are a must. Would any of these aforementioned schematics do the trick or if not does anybody know of a schematic that would convert my instrument line to a line level signal? Thank you in advance for any help you may have =)
  Reply With Quote
Old 2nd June 2011, 08:28 PM   #12
diyAudio Member
djmiddelkoop's Avatar
Join Date: Feb 2003
Location: Noord-Holland

have you seen this :

The Unbalancer

PCB is available

“Information is not knowledge Knowledge is not wisdom
Wisdom is not truth Truth is not beauty Beauty is not love Love is not music Music is THE BEST”
  Reply With Quote
Old 2nd June 2011, 08:33 PM   #13
diyAudio Member
Join Date: Jun 2011
I suppose I didn't describe exactly how "newb" I am. Which part of this link am I supposed to be looking at? If it's any of those larger contraptions it certainly won't do.
  Reply With Quote
Old 14th February 2014, 07:29 AM   #14
diyAudio Member
Join Date: Sep 2009
Location: seoul
sorry to bring up the old thread but does the transformer method create an opposite phase signal? how so?
  Reply With Quote
Old 14th February 2014, 10:27 PM   #15
diyAudio Member
dchisholm's Avatar
Join Date: Mar 2011
Location: St Louis, Mo
Originally Posted by PreSapian View Post
sorry to bring up the old thread but does the transformer method create an opposite phase signal? how so?
You could look at it that way. It all depends on how you define the " + " and " - " (or "Hi" and "Lo"; etc) on the transformer windings. It's not uncommon to see a DPDT switch on the balanced side of the transformer, wired to allow for reversing the sense of the signal.

  Reply With Quote
Old 15th February 2014, 03:14 PM   #16
LAJ is offline LAJ  United States
diyAudio Member
Join Date: Mar 2008
Location: Atlanta Ga. USA
Default When I worked in TV...

and stereo TV first came out (around 1984 or so in the USA) we occasionally got a program with out-of-phase channels. This might not be noticeable if the viewer was listening in stereo but a mono listener would get nothing.
We built an XLR phase reverser that we would patch in to one channel of the playback machine to bring everything back in phase.
This was a temporary fix till we added the dpdt switch into one of the outputs.
  Reply With Quote
Old 16th February 2014, 02:38 PM   #17
diyAudio Member
Join Date: Sep 2009
Location: seoul
what id like to know is how the transformer converts a positive wave signal into a negative.
  Reply With Quote
Old 16th February 2014, 03:09 PM   #18
diyAudio Member
BobEllis's Avatar
Join Date: Sep 2003
Location: Upstate NY
The signals at opposite ends of the secondary winding are opposite in phase. Originally you have a signal referenced to ground. By removing the ground reference you now have out of phase signals, positive and negative.
  Reply With Quote


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
unbalanced to balanced converter lumanauw Pass Labs 53 2nd June 2011 05:08 AM
Balanced To Unbalanced Audio Converter SprockeT1597 Parts 3 7th February 2009 04:03 AM
Unbalanced to Balanced Line Level XFMR wrenchone Solid State 8 22nd October 2005 08:06 PM
unbalanced to balanced converter Salsero Solid State 27 21st September 2003 09:12 AM
Zen Balanced Line Stage Balanced vs Unbalanced macka Pass Labs 28 11th December 2002 06:18 AM

New To Site? Need Help?

All times are GMT. The time now is 02:53 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2