Lightspeed Attenuator a new passive preamp - Page 443

gianc · 12th March 2012, 11:11 PM

I am using board from group buy Optical Volume Control Professional PCB

Is connection shown correct

georgehifi · 13th March 2012, 02:24 AM

No it is not, look and follow my diagram, the 5v constant goes to the wiper (center tap) yours is not the same.

BFNY · 03:09 AM

OK, interesting, the center wiper dual mono version. I saw that on someones site, but never tried it. Thanks for posting it.

gianc · 13th March 2012, 03:18 AM

This is much more confusing than just a doing stereo version.

So there is no way of using the single board in a dual mono configuration ?

I believe that is what BFNY was trying to explain to me previously.

georgehifi · 06:20 AM

Quote:

Originally Posted by gianc

This is much more confusing than just a doing stereo version.

So there is no way of using the single board in a dual mono configuration ?

I believe that is what BFNY was trying to explain to me previously.

Yes you can but you'll have to look at it closely and cut some tracks. If you post the circuit board only up track side, I will nut it out for you and put on the 2 x single 100k log pots. And post it back up.

Cheers George

georgehifi · 13th March 2012, 08:08 AM

Here it is done quicky, there are 5 cuts to make, and your calibration trimpots are still in the circuit should you need them, if the ldr's are properly quad matched you should bridge them out now that you have L&R volume controls. Like I said I did this quickly so shoot me if there are any mistakes.

Cheers George

gianc · 13th March 2012, 01:56 PM

Many thanks George.

I will post a pic of actual board showing trace side and connections as per your diagram.

georgehifi · 13th March 2012, 08:20 PM

What I have posted in post 4426 is it, follow it do the cuts and all should be right.

Cheers George

georgehifi · 13th March 2012, 08:35 PM

Just in case, here is the same but with the tracks bent around the series resistor, just in case you may have thought they were soldered to them as well.

Cheers George

gianc · 14th March 2012, 04:16 AM

Thanks again George. Aussies rule !!

I will go ahead and order the mono pots, and post results.

13th March 2012, 03:04 AM	#4423
BFNY diyAudio Member Join Date: May 2004 Location: Saratoga NY	OK, interesting, the center wiper dual mono version. I saw that on someones site, but never tried it. Thanks for posting it. Last edited by BFNY; 13th March 2012 at 03:09 AM.

13th March 2012, 08:20 PM	#4428
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	What I have posted in post 4426 is it, follow it do the cuts and all should be right. Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

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13th March 2012, 03:18 AM	#4424
gianc diyAudio Member Join Date: Oct 2004	This is much more confusing than just a doing stereo version. So there is no way of using the single board in a dual mono configuration ? I believe that is what BFNY was trying to explain to me previously.

13th March 2012, 01:56 PM	#4427
gianc diyAudio Member Join Date: Oct 2004	Many thanks George. I will post a pic of actual board showing trace side and connections as per your diagram.

14th March 2012, 04:16 AM	#4430
gianc diyAudio Member Join Date: Oct 2004	Thanks again George. Aussies rule !! I will go ahead and order the mono pots, and post results.