Potentiometer volume control treble loss bleed - 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 3rd February 2013, 06:17 PM   #1
xslavic is offline xslavic  Moldova
diyAudio Member
 
Join Date: Feb 2011
Default Potentiometer volume control treble loss bleed

Hi
i opened this thread because i can not solve the problem of using a normal stereo pot between PREAMP and AMP
it always looses treble and tweaking it Just doesnt give the same flat curve
Attached Images
File Type: jpg Immagine.jpg (37.1 KB, 60 views)
  Reply With Quote
Old 3rd February 2013, 06:50 PM   #2
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Why do you put that cap there? This makes it a high-pass filter with a turnover freq depending op the pot position.

jan
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 3rd February 2013, 07:04 PM   #3
xslavic is offline xslavic  Moldova
diyAudio Member
 
Join Date: Feb 2011
That resistor in yellow circle is fixed ,pot is not connected to ground,so varies only the other one-
any other option?
  Reply With Quote
Old 3rd February 2013, 07:05 PM   #4
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
If it always losses treble ! is the pot value much to high for any input capacitance that the wiper might see ?

Your not using a 1meg or a 100k pot and an LPF with say a 1nf or 470 pf cap are you ?
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 3rd February 2013, 07:19 PM   #5
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally Posted by xslavic View Post
That resistor in yellow circle is fixed ,pot is not connected to ground,so varies only the other one-
any other option?
Option? You put in a low pass filter and then complain of treble loss? Is this a joke?

jan
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 3rd February 2013, 07:26 PM   #6
xslavic is offline xslavic  Moldova
diyAudio Member
 
Join Date: Feb 2011
I lose treble without cap,only hpf with cap and FIXED resistor solves the problem ,hpf 21 hz
The other fixed parallel improves quality but still not to good,does not attenuate to well
I thought adding another parallel resistor
Pot is 50k cap is 150nf and res to gnd is 51k

Correction its a HPF

Last edited by xslavic; 3rd February 2013 at 07:30 PM.
  Reply With Quote
Old 4th February 2013, 11:30 AM   #7
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
To have a volume control it is not enough to put a "normal stereo pot" between preamp and amp; you also have to wire it correctly as a normal potential divider i.e. volume control.

If you wire it as a tone control then guess what: you get a tone control!!
  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
Installing a potentiometer/volume control pghfrftr Instruments and Amps 10 4th August 2012 06:38 PM
Potentiometer as a volume control RRSS Construction Tips 10 31st March 2012 01:16 AM
Volume Control Potentiometer Recommendation? TheLaw117 Parts 3 18th September 2010 10:01 PM
Volume Control (potentiometer) SergeDufour Parts 1 6th December 2006 09:56 PM
Digital potentiometer as volume control Bricolo Solid State 15 29th January 2003 08:32 PM


New To Site? Need Help?

All times are GMT. The time now is 10:49 AM.


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