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Old 1st September 2006, 03:10 AM   #1
diyAudio Member
 
Join Date: Aug 2006
Default Advice for diy Volume Control

Hi all,

I'm noob in electronics but want to try DIY a simple Vol. Control

I want to make a very simple volume control between my DAC and Active Cross-Over Unit.

From the MultiMeter Reading, my DAC RCA output jacks have 10K Ohm (also claimed to have 2.5V output)

The destination RCA input jacks of Active Cross-Over Unit have 7K Ohm (reading from multimeter)

I tried to diy a simple POT with IN OUT RCA Jacks (tried 1K, 10K, 20K, 50K, 100K)

I got a active preamp for test of volume before I plug the diy POT between in order to avoid sudden burst out of volume.

"Safe" test path: DAC > diy POT > active preamp > Active XO
Test path : DAC > diy POT > Active XO


Regardless of (value of K of the POT,), the sound level will suddenly increase hugely. Simply cannot rotate the POT's 1/10. I have difficulty to archieve the suitable volume level.

Appreciate for advices.
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Old 1st September 2006, 03:22 AM   #2
diyAudio Member
 
Join Date: Feb 2002
Location: Western Sydney
Default taper

What taper pots are you using?
sounds like you're using linear taper,

for volume control you need Log taper.

Regards,
Pete McK
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Old 1st September 2006, 03:28 AM   #3
diyAudio Member
 
Join Date: Feb 2002
Location: Western Sydney
Default explanation

Check out this page for an explanation,
and how you can change one of the pots you already have to
log taper with a couple of resistors:

http://sound.westhost.com/pots.htm#chg-law
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Old 1st September 2006, 11:07 AM   #4
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
sounds more like you have not connected the grounds to the pot lower leg.
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regards Andrew T.
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Old 2nd September 2006, 05:50 PM   #5
diyAudio Member
 
Join Date: Aug 2006
Default Re: explanation

Quote:
Originally posted by PeteMcK
Check out this page for an explanation,
and how you can change one of the pots you already have to
log taper with a couple of resistors:

http://sound.westhost.com/pots.htm#chg-law

Quote:
Originally posted by AndrewT
Hi,
sounds more like you have not connected the grounds to the pot lower leg.

Thanks You guys. The attached link really helped me that I finally know a POT with connection and grounding could have different functions!

As a noob in electronics, simple thing like above already giving me big trouble!
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