Dual-gang linear pot as splitter and front/rear balance control? - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 10th July 2012, 06:07 AM   #1
diyAudio Member
 
Join Date: Oct 2010
Default Dual-gang linear pot as splitter and front/rear balance control?

My head unit only has one stereo pair of RCA outs. My 4 channel amp is currently setup to internally split the channel 1-2 input to run channels 3-4 as well. The problem is I badly need front/rear fade control (which i obviously don't get with a single rca out - just left/right). Can I simply use a dual-gang, linear taper pot between the head unit and the amp to split the signal and provide a simple and cheap fade control? It would be somewhat like a volume control but instead of returning the 'extra' signal to ground I'd send it along to its own channel. Sorry if I'm using the wrong terminology but I think someone will be able to make sense of this! Also, what should I use? 50K? 100K?
  Reply With Quote
Old 10th July 2012, 08:32 AM   #2
diyAudio Member
 
Join Date: Apr 2011
Location: Anchorage AK
hmm, i take it you have a certain pot in mind that you have used? or by "dual-gang, you are referring to a double pot, not a dual gang home audio speaker controller. those, do not return the signal to ground, rather adjust resistance. are you utilizing the r/l balance? if not, i would simply use y-splitters and run right to 1/2, and left to 3/4, and then you could just use balancing as the fade control. another option would be to pick up a cheap line-driver, or basic similar equalizer. the once popular 1/2 din units used to often have a fader built-in and sub output, all switchable. i have not played with pots too much, other than replacing with the proper ones. i would suggest looking at different ones, you may just find a ballncing double pot. as far as i know, 100ohms should get you full attunation, however, a linear pot will give full signal to one side at a time, and only 1/2 signal when centered. if you have enough gain adjustment for that, then you could pick up a cheap rca in-line adjuster, and it will have 2 channels. you should be able to upen it up and tap into the unused legs (no guarantee it has them) and that would do what you want, just make sure the signal is on the centered leg.
  Reply With Quote
Old 10th July 2012, 04:15 PM   #3
diyAudio Member
 
Join Date: Oct 2010
No, its a dual pot (as in two pots stacked with a single shaft running through both). As far the the ground thing I was talking about, see the diagram in this link:

Volume control.

That circuit is using a dual gang pot to control volume. It seems to me that whatever signal isn't sent from the input to the amp is sent to ground. What I want to do is use a similar circuit with a linear pot but, the additional signal is instead sent to another channel. I figured, given a linear pot, centering the pot would send equal the signal across both output pins and rotating the pot either way would favor one channel or the other (giving me my front/back fade).

Would this degrade my signal? It was my understanding that using splitters would not affect the signal voltage and therefore the amp would not no any difference so I was hoping I could do the same with a pot.
  Reply With Quote
Old 10th July 2012, 10:51 PM   #4
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The Potentiometer page of the site shows how to make an inline level control. You'll split the signal and insert the potentiometer between the y-cable and the rear channels of the amp.

With the circuit on this page, the signal isn't shunted to ground. The wiper of the pot simply taps off of the resistive element at various points to produce the desired output level.
  Reply With Quote
Old 11th July 2012, 04:15 AM   #5
diyAudio Member
 
Join Date: Oct 2010
Ok, so basically run a splitter with a volume control in line with the rear channel to lower its level and bring it audibly to the level of the unaffected front channel?
  Reply With Quote
Old 12th July 2012, 02:13 AM   #6
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Yes.
  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
Help me remove a dual-gang pot out of the circuit!! maglian Subwoofers 4 17th December 2011 03:45 PM
wiring a dual gang pot kendarmstat Analog Line Level 2 25th August 2011 12:39 PM
WTB: 10k dual gang log pot. (A) maurycy Swap Meet 4 9th February 2011 01:57 PM
Dual gang pot burbeck Parts 5 30th October 2007 09:49 PM


New To Site? Need Help?

All times are GMT. The time now is 11:59 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