How to split output from phono stage - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

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
Reply
 
Thread Tools Search this Thread
Old 8th September 2013, 12:37 AM   #1
Swarky is offline Swarky  Spain
diyAudio Member
 
Join Date: Feb 2009
Default How to split output from phono stage

I need 2 line level outputs from my phono stage : 1 for my integrated and speakers and 1 for my headphone amp ? How can I do this ? Just a daisy chain (been there) to another set of RCA terminals spoils the sound.
IŽd like to avoid using the tape out from my integrated because it sounds more processed and is not the same.
Thanks,
Chris
  Reply With Quote
Old 8th September 2013, 08:22 AM   #2
diyAudio Member
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
If you use a common collector stage, splitting the outputs will keep the output impedance low.
NPN Common Collector Amplifiers
Have a look at the theory and there are a couple of useful circuits on this site.
Make the emitter resistor equal to 560R and then use 1k2 as dual feeds from each stage.
This will work nicely at line level.
__________________
www.flyingmole.co.uk For World Wide support for Flying Mole, Class D, Refurbishment and Repairs. www.jonsnell.co.uk
  Reply With Quote
Old 8th September 2013, 04:02 PM   #3
DF96 is online now DF96  England
diyAudio Member
 
Join Date: May 2007
Simply adding a second set of output terminals won't spoil the sound. What can do this is the non-linear loading of an unpowered input. You need a buffer, as Jon suggests.
  Reply With Quote
Old 9th September 2013, 06:40 AM   #4
John8 is offline John8  United Kingdom
diyAudio Member
 
Join Date: Dec 2005
Location: Nottingham England
Common collector (emitter followers) don't like to see a capacitive load, they can turn into a nice RF oscillator. It is important to ensure there is some series resistance directly on the output so that the emitter sees a resistive load.
By using a split feed this requirement will be met and there should be no problems with spurious oscillations.
  Reply With Quote
Old 9th September 2013, 06:44 AM   #5
Swarky is offline Swarky  Spain
diyAudio Member
 
Join Date: Feb 2009
Can a buffer be implemented using an op-amp ? Which is best ?
  Reply With Quote
Old 11th September 2013, 06:41 AM   #6
Swarky is offline Swarky  Spain
diyAudio Member
 
Join Date: Feb 2009
What about a good quality switch - 1 for phones amp and 0 for main speaker system - Would this solve my problem without resorting to a buffer ? Any ideas on which switch ? Or is this a no-no ?
  Reply With Quote
Old 11th September 2013, 07:06 AM   #7
John8 is offline John8  United Kingdom
diyAudio Member
 
Join Date: Dec 2005
Location: Nottingham England
Yes a simple 2 pole changeover switch would be an easy solution.
I have done this for a number of applications with no problems using a cheap and cheerful mini toggle switch mounted in a small plastic box along with the input and 2 pairs of output sockets.
It can be used in reverse for two sources into a single input as well.
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Phono Stage w/split passive RIAA, Instrumentation input wagneric Analogue Source 16 4th April 2013 07:23 PM
split push-pull output stage andrew_whitham Tubes / Valves 16 22nd March 2007 06:25 PM
Differential output phono stage PCB xavier1000 Solid State 6 28th February 2006 06:26 PM
Should I replace Scott 222C phono stage with Claret phono stage? Bing Yang Analogue Source 0 22nd August 2005 06:41 AM
Pearl Phono stage output matching? Gregorio Analogue Source 1 30th June 2004 02:06 PM


New To Site? Need Help?

All times are GMT. The time now is 07:06 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