Making a very simple volume control - 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 14th March 2012, 07:37 AM   #1
diyAudio Member
 
Join Date: Mar 2012
Default Making a very simple volume control

I have a lee Jackson gp1000 guitar Pre amp that I've modified a bit (cathode resistor and bypass cap) that goes into a digitech gsp1101. Where does this all come into play, well the lee Jacksons output is SOO hot it overloads the Gsp. I can have the volume less then 1 and it becomes managable but the sweet spot is so small.

If I just took a 50k pot, would this reduce volume without changing much tone? I don't mind a loss of some highs but I'm not looking for an expensive or complicated solution.

A better solution would be to mod the Pre amp so it's output is more ideal but with a tour 3 days away... Well you get the point.
  Reply With Quote
Old 14th March 2012, 08:54 AM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
The answer depends on the output impedance/drive ability of the preamp and the input impedance of the GSP1101

Not familiar with either product but when you mention valves we are usually talking "poor" (compared to solid state) drive ability. If the preamp can drive 50K then there's no problem and 50K is low enough that it shouldn't alter the "tone" as you put it. The pot forms a low pass filter in combination with the input capacitance of the GSP1101.

So you have two compromises... lower value resistance is "better" for an attenuator if the preamp can drive it, higher resistance is better if it can't but the tradeoff could be a low of HF if the input capacitance (the capacitance seen by the pot wiper) is high. Ther valve stages will be AC coupled so again there is a filter action. This time high pass. So lower value pot could decrease bass output depending on value of coupling caps.

Also if you use a pot then I would then measure the resistance values when it's set OK and make a fixed attenuator.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  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
DIY making a dual gang potentiometer ? (for volume control) guitar89 Parts 9 15th October 2011 09:36 AM
quite simple volume control broenni Solid State 20 15th August 2010 06:42 PM
Simple sub volume control Dan2 Car Audio 3 9th December 2007 04:24 PM
Simple, SIMPLE Digital volume control -_nando-_ Digital Source 5 21st December 2006 02:20 PM
ESP making a remote volume control ultrachrome Parts 0 18th November 2004 06:35 PM


New To Site? Need Help?

All times are GMT. The time now is 04:26 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