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Ultimate Volume Control

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Posted on September 8, 2009 at 19:32:05
aura
Audiophile

Posts: 2
Location: Auckland
Joined: December 21, 2008
 Hi Brian,
Some UVC questions please:

In standard mode how many resistors are involved in the signal path?

What are the pros and cons of Standard and shunt modes?

I notice that the volume and selector switches move in a continuous movement without a stop, why is this?

Regards

MiHan
RE: Ultimate Volume Control, posted on September 12, 2009 at 18:12:37
bcherry
Manufacturer

Posts: 2216
Joined: March 11, 2001
Contributor
  Since: June 1, 2001
 Hello

The UVC uses uses an analogue solid state potentiometer with 127 resistive elements in series so the number of resistive elements depends on the number of steps selected. We may be thinking of series connected resistors on a physical switch and all those solder joints. But this device is an IC and does not have such issues. The miniature size also negates capacitive effects. The device used is the DS1666 as used in some very high end premaplifiers such as Audio Research.

Shunt mode moves the resistive elements of the potentiometer out of the signal path so that only one user selected shunt resistor is in the signal path. This resistor dominates the with its signature sound, be it metal film, tantalum, Vishay nude, whatever sound is preferred.

The control switches are digital encoders without a stop, referenced to the LED display. Just like push buttons, keep pressing up to raise, down to lower.

regards
Brian



DIY - Done Right!
RE: Ultimate Volume Control, posted on September 15, 2009 at 01:37:05
aura
Audiophile

Posts: 2
Location: Auckland
Joined: December 21, 2008
 Brian,
It looks as if shunt mode is the way to go, especially as you not only have control of the sound quality but also the input impedance. Standard mode is set at 100K only. Is that right?

Regards

MiHan

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