Balanced Stereo Pot for Balanced B1?

rgheck · 4th September 2009, 10:07 PM

Does anyone know of a reasonably priced balanced stereo pot suitable for use with a balanced version of the B1? (Such is what I am trying to build.) Failing that, can anyone recommend a reasonably priced stereo pot that will have suitably good tracking that I could use two of them? I don't really want to shell out $375 or whatever for the DACT.

coloradosound · 4th September 2009, 10:48 PM

Texas Instruments PGA2310, PGA2311, and PGA2320 or Cirrus Logic CS3310 can do very
tight tracking if you want to go digitally controlled route. Use 2 chips (+ and -) signals
through each channel + PIC controller.

DougL · 4th September 2009, 10:51 PM

You are probably better off with a shunt attenuator for tracking.

http://www.kandkaudio.com/linestage.html

Stepped Shunt Attenuator at the bottom of the page.

Doug

rgheck · 5th September 2009, 03:05 PM

Thanks for both of these suggestions. The stepped shunt thing looks like an option, though two of them are almost as much as the DACT. I've no clue about the digitally controlled stuff.

DougL · 5th September 2009, 03:22 PM

Quote:

though two of them are almost as much as the DACT

Why 2? One of them (its a stereo attenuator) can handle both channels, because you are not attenuating the 2 inputs separately. Because its 1 shunt element, CMRR is preserved.

Doug

rgheck · 10th September 2009, 06:01 PM

Yes, sorry, that was silly. I can build these things, but it doesn't mean I understand them.

Anyway, thanks again for the suggestion. Now another possibly silly question. How exactly does this thing get wired into the circuit? I ask about this both as regards the balanced use and, perhaps before I get that built, the unbalanced use.

Thanks in advance.

4th September 2009, 10:07 PM	#1
rgheck diyAudio Member Join Date: Aug 2003 Location: Canton MA	Balanced Stereo Pot for Balanced B1? Does anyone know of a reasonably priced balanced stereo pot suitable for use with a balanced version of the B1? (Such is what I am trying to build.) Failing that, can anyone recommend a reasonably priced stereo pot that will have suitably good tracking that I could use two of them? I don't really want to shell out $375 or whatever for the DACT.

4th September 2009, 10:51 PM	#3
DougL diyAudio Member Join Date: Feb 2004 Location: Wheaton IL. Blog Entries: 25	You are probably better off with a shunt attenuator for tracking. http://www.kandkaudio.com/linestage.html Stepped Shunt Attenuator at the bottom of the page. Doug __________________ Scienta sine ars nihil est - Science without Art is nothing. (Implies the converse as well) Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus

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4th September 2009, 10:48 PM	#2
coloradosound diyAudio Member Join Date: Nov 2005 Location: colorado	Texas Instruments PGA2310, PGA2311, and PGA2320 or Cirrus Logic CS3310 can do very tight tracking if you want to go digitally controlled route. Use 2 chips (+ and -) signals through each channel + PIC controller.

5th September 2009, 03:05 PM	#4
rgheck diyAudio Member Join Date: Aug 2003 Location: Canton MA	Thanks for both of these suggestions. The stepped shunt thing looks like an option, though two of them are almost as much as the DACT. I've no clue about the digitally controlled stuff.

10th September 2009, 06:01 PM	#6
rgheck diyAudio Member Join Date: Aug 2003 Location: Canton MA	Yes, sorry, that was silly. I can build these things, but it doesn't mean I understand them. Anyway, thanks again for the suggestion. Now another possibly silly question. How exactly does this thing get wired into the circuit? I ask about this both as regards the balanced use and, perhaps before I get that built, the unbalanced use. Thanks in advance.

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