unbalanced stereo out to mono summed balanced output - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 11th January 2009, 02:08 PM   #1
diyAudio Member
Join Date: Nov 2002
Default unbalanced stereo out to mono summed balanced output

Waht would be the proper configuration to make a adapter to go from a 15K stereo output from a CD player to a summed 600 ohm balanced input to the next device in a chain?

I don't want to use a Y adapter.
  Reply With Quote
Old 11th January 2009, 02:21 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
inverting opamp with two summing resistors on the input.

Is the 600ohm connection really 600r?
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote
Old 11th January 2009, 02:23 PM   #3
diyAudio Member
Join Date: Nov 2002
Its really 600 ohm.

Didn't want to use an op amp. I was thinking a passive circuit using resistors.
  Reply With Quote
Old 11th January 2009, 05:45 PM   #4
djk is offline djk
diyAudio Member
djk's Avatar
Join Date: Feb 2001
Location: USA
Hi Joe!

I would try a pair of 1K resistors, one on each of the 'hot' outputs of the RCA, into the 600R input 'hot'. The 'cold' of the 600R input I would return to the RCA common ground through a 560R.

Depending on how close to 600R input impedance actaually is, we will have a loss on the order of about 10dB.

The 1K resistors will prevent the CD player output stage from driving too hard on signals that are not common to both channels.

A transformer could be employed if full isolation is needed (ground loop), but it will have a very low output (mic level).

Candidates for the Darwin Award should not read this author.
  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
Bridge Mono a stereo amplifier with balanced outputs gni Solid State 1 16th April 2009 02:44 PM
difference between mixed mono and summed mono Clipped Car Audio 4 10th October 2007 11:34 AM
D1 I/V, balanced dac, unbalanced output 00940 Pass Labs 2 30th April 2005 12:12 AM
Stereo to mono via speaker output???? rabbitz Multi-Way 1 8th August 2003 02:10 PM
What are the correct output line levels for unbalanced & balanced? Brian Guralnick Digital Source 4 25th October 2002 06:27 PM

New To Site? Need Help?

All times are GMT. The time now is 06:04 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