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 25th September 2009, 06:31 PM   #1
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
Default Need to make 3 line outs from 1

Hello.

I'm planning to tweak one Car CD-player (Honda Accord 2008).

It hasn't pre outs, so I'll try to make some and get signal before power amp.

But I'm worrying about one problem. I need 2 or 3 line outs to make per-channel amplification (some kind of bi-amp).
And I think that paralleling 3 outs is not very good idea, right?

Can You please give me advice how can i make this? Maybe some kind of simple buffer based on opamp? I would be very pleased if someone share scheme of this...
  Reply With Quote
Old 25th September 2009, 09:09 PM   #2
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
If the pre-amp (really it's a line amp, as the output voltage stays the same) has a robust output stage and all the power amps have the same type input stage, than the pre-line-buffer-amp should have no problems driving several amps. Problems sometimes arise with amp inputs that but different demands on the buffer. Turning one of the amps off can cause high distortion in the other connected amps.
__________________
Kevin
  Reply With Quote
Old 26th September 2009, 06:31 AM   #3
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
Thanks for answer.

It's actually not line-amp, but pre-amp-out because it is placed right before the amp stage...

I just worried about output resistance and signal level of pre amp stage. If normal out has x kiliohms, than 3 paralleled will have about three time lower, right? And normal output level is ~2V, than paralleling three out will have the same value or lower?
  Reply With Quote
Old 26th September 2009, 06:45 AM   #4
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
Go with a CF and a ECC82 ! Everybody would say " Ohhh! That's amazing ! Tubes in a car ! " if you put them in sight , otherwise nobody wouldn't say anything.
  Reply With Quote
Old 26th September 2009, 10:21 AM   #5
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
It's cool to have tubes in car, but i haven't work with them and it's not my car

I just need to know the best way to get 3 pre outs from stock (without factory pre-outs) system
  Reply With Quote
Old 26th September 2009, 10:29 AM   #6
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
Better if it's not your car ! You can ask a lot for charge and keep the rest..
I was posting you a simple schematic altough it would require a noiseless DC-DC converter to raise the voltage to 250 V. Better go with the simple applications of the TL061...and change from split supply to single supply ...or use two 9V batteries.
Sorry I threw off all my books!
  Reply With Quote
Old 26th September 2009, 12:48 PM   #7
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
No thanks, 250V without skills - it's very dangerous in car.

I need simple solution for 0...9V or +\-12...15V

Quote:
I was posting you a simple schematic
Sory, but where did you post that? : )

Quote:
Better if it's not your car ! You can ask a lot for charge and keep the rest..
It's not case of commercial, I just help someone to build SQ car and now we are thinking over future project, before buying amps and loudspeakers.
  Reply With Quote
Old 26th September 2009, 01:09 PM   #8
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
Hello Stream !Got rid of all my books 'cos everything is on the Web.
Here's the application note...Eeek! A mouse !
I was posting you a vacuum tube one , but you can easily find it..perhaps better if supplied with lower voltage ie. 80 V.
Attached Images
File Type: jpg buffer.jpg (28.7 KB, 74 views)
  Reply With Quote
Old 26th September 2009, 01:59 PM   #9
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
Thank You. It looks like subj
What is the "name" of this scheme? I would like to search addition info about this.
  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
Akai GX 265D line voltage on line outs? ShorBird Solid State 11 26th January 2009 11:44 PM
device for 40 line outs on the mac?? do it yourself solutions birdhouse_1000 Parts 7 9th January 2009 08:51 PM
Feasible to make a line-level 3rd-order infrasonic filter? noah katz Subwoofers 19 21st September 2005 06:35 PM
Neet to make a + 0 - 12dB software controllable line level amp. bans25 Solid State 8 20th April 2005 06:31 PM
ins and outs set Subwoofers 7 16th February 2005 12:31 AM


New To Site? Need Help?

All times are GMT. The time now is 04:12 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