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Lightspeed Attenuator a new passive preamp
Lightspeed Attenuator a new passive preamp
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Old 12th August 2016, 07:00 AM   #5571
georgehifi is offline georgehifi  Australia
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It will be messy but can be done, to replace each single gang pot you'll need two NSL32SR2's.
Then you could probably use the existing pot's it has to be the voltage controller for the led section of the NSL32SR2.

Cheers George
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Old 12th August 2016, 02:21 PM   #5572
noviygera is offline noviygera  United States
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Do you think 8 LDRs in in the signal path would be more transparent in terms of audio than 8 "blue velvet" pots?
Is there any additional control hardware that Needs to fit into the mixer to use LDRs In addition to actual LDRs and pots to control them?
Herman
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Old 12th August 2016, 09:46 PM   #5573
georgehifi is offline georgehifi  Australia
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Does a single sound better than one, general consensus of Lightspeed owners is yes.

Cheers George
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Old 12th August 2016, 11:17 PM   #5574
Chris Daly is offline Chris Daly  Australia
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Quote:
Originally Posted by noviygera View Post
Do you think 8 LDRs in in the signal path would be more transparent in terms of audio than 8 "blue velvet" pots?
Is there any additional control hardware that Needs to fit into the mixer to use LDRs In addition to actual LDRs and pots to control them?
Herman
What you are not being provided answer on post after post, is that mixers invariably
have balanced circuits, but also cater for some unbalanced inputs as well
ie the rear panel of the link you provided - ( although not the mixer you intend to convert ) - shows XLR connections. An overview of the fundamental differences is here:
http://www.perreaux.com/blog/2012/2/...balanced-audio

One way to do balanced with LDR's involves achieving a signal side double L pad, and careful matching of not only Left to Right, but also then Hot to Cold. When done correctly It works well !

I suggest though to involve firstly sourcing the schematic for the mixer you actually intend to convert.
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Old 13th August 2016, 06:15 AM   #5575
AndrewT is offline AndrewT  Scotland
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What he is not telling you is that it is the connections that are balanced.
The system is balanced impedance and that impedance is referring to the connections.

Make the inputs and outputs balanced. Use balanced connections, Use balanced complimentary equipment.

Inside the mixer it is far easier to convert all the bal inputs to unbalanced. process all the signals inside as unbalanced. Then convert the signals back to balanced ready for the balanced impedance connections.
Look at B.Putzeys' balanced volume control to see this in operation. Bal input > bal 1st stage > bal to unbal 2nd stage > unbalanced vol pot > unbal to bal output stage > bal output.
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Old 14th August 2016, 03:09 PM   #5576
noviygera is offline noviygera  United States
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By the way it would be fair to mention that I do not have a design and schematic. I'd love to work with someone who can help design and tune this project to my needs.
Can anyone suggest a capable designer who would work on a mixer project for money?

In this application I will use unbalanced inputs and balanced outputs.
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Old 6th December 2016, 04:03 AM   #5577
dv187736 is offline dv187736
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Just new in this thread though I've read the posts till p510. I'd like to build an SLA but the only LDR readily available locally is NSL32SR3. My questions may have been asked already but I'll ask anyway. Are the only reasons for not preferring the NSL32SR3:
- harder to get a matched pair/quad?
- issue with getting lowest resistance(?) that affect low volume listening?
Though it might be difficult, are there ways to go around these? Thanks in advance.
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Old 11th December 2016, 11:11 AM   #5578
gianxdiy is offline gianxdiy  Italy
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Hi guys, just a feedback:
mounted the second kit provided by Uriah on a Copland CSA-8.
I choosed 2way pot for 20k total impedance. Perfect balance tight, round and powerful bass, airy mids, more refined highs, stable and focused stage.
What can i say?
Many many thanks George and Uriah!!!
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Old 11th December 2016, 06:20 PM   #5579
georgehifi is offline georgehifi  Australia
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Quote:
Originally Posted by dv187736 View Post
Just new in this thread though I've read the posts till p510. I'd like to build an SLA but the only LDR readily available locally is NSL32SR3. My questions may have been asked already but I'll ask anyway. Are the only reasons for not preferring the NSL32SR3:
- harder to get a matched pair/quad?
- issue with getting lowest resistance(?) that affect low volume listening?
Though it might be difficult, are there ways to go around these? Thanks in advance.
You could parallel up the S3's to get a lower impedance, then matching up quad sets will become an even bigger headache.

Cheers George
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Old 13th December 2016, 09:14 AM   #5580
dv187736 is offline dv187736
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Quote:
Originally Posted by georgehifi View Post
You could parallel up the S3's to get a lower impedance, then matching up quad sets will become an even bigger headache.

Cheers George
Thanks, George, for the advice. Will take note of this should I go ahead with the SR3s.
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