Yet another Volume controlers and source selections - Page 72

tvicol · 04:23 PM

Quote:

Originally Posted by Jempie

it's the same board as you can buy from tibi.
turn the volume up, and disconnoct the source you will hear hum

Jempie,

There are two 0 ohm resistors on the board R42L and R42R.
These are connecting VC ground to VC power suppply ground.
Normally these resistors shouldn't be connected. However, we have provided them in case you want to make a single ground star for all power sources in your design.
If these resistor are not connected, than you should search for hum elsewhere, because in this case VC is completely isolated from any power supply.

Regards,
Tibi

FarmTech · 21st January 2012, 09:54 PM

Hi Jempie,
Did you cure the hum problem ?

aditya · 6th February 2012, 02:45 AM

hi
made this pcb for replacing my pga2311 ( vvvvvvvery sweet chip) card, since things are modular in my amp.. i can relace the processor, amp, power filters. so even my preamp is sort of modular...

anyways just posting the pic of the pcb... let me how to improve it more.. if possible..

yes i know i should have used mkt capz.... but .... i wanted to make it small and couldnt source all the cap in same chemical family in bombay market.. anyways.. did what i could

tvicol · 14th February 2012, 06:54 PM

For those who like to use avrdude, I have added a small how to:
http://vicol-audio.ro/img/volume-con...r_firmware.pdf

Also more documentation is available at vicol audio : r-2r volume controller

Regards,
Tibi

TBKK · 18th February 2012, 03:30 PM

Farmtech

According to the regular r2r schematic the resistors are

R30-R40
10k 2.5k 5.8k 15k 53k 390k
R31-R41
82k 47k 27k 16k 12k 10k

If you compare link Logarithmic Attenuator Calculator

The value are different

10k 8k2 5k6 3k9. I have the Same problem as jempie

FarmTech · 19th February 2012, 06:53 AM

Hi
I did not make the electronic part of this only made some software (addons) for it
so better ask one that know more about R2R than I do

TBKK · 19th February 2012, 08:52 PM

I hate also that the volume at "0" is not really quit

Pryanick · 12:46 PM

TBKK,
use 7relais R/2R with "-127dB" at "0" volume level like i did
Or recalc R/2R for -127dB with 2dB step

Jempie · 23rd February 2012, 07:35 AM

Tbbk,

I have the same problems, clinking is
reduce thanks to Pryanick.

Will try now to recalculate the resistors
With steps of 1.5 dB or 2 dB
still is not easy to make it right

Pryanick · 23rd February 2012, 08:11 AM

Jempie,
the only way to do it right is do it ones in a proper way

21st January 2012, 09:54 PM	#712
FarmTech diyAudio Member Join Date: Mar 2010 Location: Hjørring Denmark	Hi Jempie, Did you cure the hum problem ? __________________ /Kim - Bascom-AVR user My new website

14th February 2012, 06:54 PM	#714
tvicol diyAudio Member Join Date: Jan 2005 Location: Bucharest	For those who like to use avrdude, I have added a small how to: http://vicol-audio.ro/img/volume-con...r_firmware.pdf Also more documentation is available at vicol audio : r-2r volume controller Regards, Tibi __________________ Shigaclone PCB Project Shigaclone BOM Vicol-Audio Vicol-Audio products

19th February 2012, 06:53 AM	#716
FarmTech diyAudio Member Join Date: Mar 2010 Location: Hjørring Denmark	Hi I did not make the electronic part of this only made some software (addons) for it so better ask one that know more about R2R than I do __________________ /Kim - Bascom-AVR user My new website

22nd February 2012, 12:42 PM	#718
Pryanick diyAudio Member Join Date: Nov 2009 Location: Minsk	TBKK, use 7relais R/2R with "-127dB" at "0" volume level like i did Or recalc R/2R for -127dB with 2dB step Last edited by Pryanick; 22nd February 2012 at 12:46 PM.

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18th February 2012, 03:30 PM	#715
TBKK diyAudio Member Join Date: Jun 2010	Farmtech According to the regular r2r schematic the resistors are R30-R40 10k 2.5k 5.8k 15k 53k 390k R31-R41 82k 47k 27k 16k 12k 10k If you compare link Logarithmic Attenuator Calculator The value are different 10k 8k2 5k6 3k9. I have the Same problem as jempie

19th February 2012, 08:52 PM	#717
TBKK diyAudio Member Join Date: Jun 2010	I hate also that the volume at "0" is not really quit

23rd February 2012, 07:35 AM	#719
Jempie diyAudio Member Join Date: Jan 2008	Tbbk, I have the same problems, clinking is reduce thanks to Pryanick. Will try now to recalculate the resistors With steps of 1.5 dB or 2 dB still is not easy to make it right

23rd February 2012, 08:11 AM	#720
Pryanick diyAudio Member Join Date: Nov 2009 Location: Minsk	Jempie, the only way to do it right is do it ones in a proper way

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