Small Fader + Volume control for Car - 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 17th January 2013, 10:03 PM   #1
diyAudio Member
 
Join Date: Jan 2013
Default Small Fader + Volume control for Car

[Repost: Posted this in Digital Line Level when i think it should be here]

Okay guys, massive noob here so bear with me, trying to understand everything as best I can, not even sure if this is the right forum or if it should go in the car section but I _THINK_ this is the right place :F

Basically I wanna hook a tablet into my dash to replace my head unit but it will take up all the available space. I'll be running a DAC DESTROYER that i got off ebay as a USB DAC running to my 5ch amp. Since the tablet will be permanently mounted into the dash I won't have any decent access to the volume control. Also, the output will obviously only be two channels. I'm pretty sure that's okay though, I think its safe to just bridge the RCA's at the amp to power the rears and sub, not too certain if this is okay when you start talking impedance but from what I gather, that's more important on the amp's output? :F

Anyway, the question is, I really don't want to lose a physical volume knob and I want to keep some fader control because my rear speakers are pretty terrible and don't want them kicking as hard as the fronts. I know I can control this at the amp and I _THINK_ with the usb dac I will still have volume control from the tablet, but that's a bit shitty. Having a proper volume control that's accessible instantly seems pretty important. The only place I can think of mounting knobs on the centre console now will be in the ash tray.

http://www.goauto.com.au/mellor/mellor.nsf/0/AFAA1A50CCEFDFE0CA256B66000738A3/$file/2001.8.3nB3P01E_con_Subaru_ImprezaRV.jpg?OpenEleme nt

bit small, but if you look closely you can see the spot im talking about is next to the cigarette lighter socket which I want to keep so I can't just hack in a half-din eq.

Is there any solution to this? I'm competent in electronics (just don't know much about audio) so if there's a diy solution i wouldn't be too afraid of attempting that. Pretty much want to go from USB DAC [2ch rca] -> Volume/Fader [4ch(or 5ch) rca] -> amp with a small footprint on the volume/fader.

Any help would be greatly appreciated!
  Reply With Quote
Old 20th January 2013, 11:34 AM   #2
dangus is offline dangus  Canada
diyAudio Member
 
Join Date: May 2004
Location: Vancouver Island
It's good to have a real volume control between the sound device and the amps. Particularly if it's illegal to use a touchscreen while driving. If the car includes steering-wheel mounted controls, figure out how to use those. Some USB audio devices do include internal volume control ability, and have inputs for volume control buttons.

You might get away with just using a couple of passive stereo pots; use the first pot as the main volume control, and feed the front channels directy. Use the second pot to reduce the volume as necessary to feed the rear channel amps. I assume the multichannel amp includes an active crossover.

Now, you could run into problems with ground loops between the tablet and the audio stuff. Ideally, I would use either balanced lines or isolate the source using an S/PDIF digital output. $20 on eBay would get you a small and probably not horrible DAC that could be mounted up front or back with the amps. You could get motorized pots to use as remotely mounted volume controls. (I think I got one from Digikey, made by Alps.) The motor could be controlled from a DPDT spring-return-to-center-off switch of some kind (rotary, rocker, toggle; perhaps a power window switch).

Alternatively, there were car digital surround processors like the Panasonic CY-AC300; you could feed one of those from S/PDIF and use the remote faceplate for volume. Those kinds of boxes were expensive, but not popular; I found one on the bargain table at a car audio dealer.

Last edited by dangus; 20th January 2013 at 11:52 AM.
  Reply With Quote
Old 20th January 2013, 01:25 PM   #3
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
remote volume control:

http://www.ti.com/lit/ds/symlink/lm1036.pdf

single control pot physically small
__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  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
Small Fader + Volume Control for car seanuleh Digital Line Level 2 17th January 2013 10:02 PM
Need a small quality volume control lionking7 Parts 2 14th May 2009 02:41 PM
How to ID volume & fader pots? jol50 Car Audio 54 18th January 2008 06:26 AM
Digital Volume control for in Car use dunderchief Digital Source 7 28th March 2004 01:08 AM


New To Site? Need Help?

All times are GMT. The time now is 11:49 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