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Old 29th August 2012, 03:47 PM   #201
ChrisPa is offline ChrisPa  United Kingdom
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Quote:
Originally Posted by chaparK View Post
I need to have a feel of what proportion of boards should get the analogue volume chip mounted on it, so I'd like to ask you whether you would prefer a board with the CS3318, or without that chip in order to save about USD 40. (If there's no analogue volume chip, the DACs are in charge of the volume control in digital domain - so there's still volume control, no worries).
Just to confirm,

even if the analogue gain chips are fitted the board can still be used as digital only?

ie.
digital inputs -> dsp -> digital gain -> digital out
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Old 29th August 2012, 05:02 PM   #202
jtwrace is offline jtwrace  United States
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What about adding a poll?
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Old 29th August 2012, 06:58 PM   #203
chaparK is offline chaparK  Luxembourg
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Originally Posted by alugner View Post
All right, I enlist for a board with the CS3318. I'm quite new to posting here but I've followed this thread with interest. Exciting!
Thanks for your feedback!

Quote:
Originally Posted by dahlberg View Post
I'll take a complete board Have you decided on what op-amps to use ?
If I'm using opamps at all I kind of like the "LT 1361".
Another vote for CS3318! Just a reminder: Opamps are all on sockets. Swapping for all of them takes 1 minute

Quote:
Originally Posted by ChrisPa View Post
Just to confirm,

even if the analogue gain chips are fitted the board can still be used as digital only?

ie.
digital inputs -> dsp -> digital gain -> digital out
No, the volume takes place only on the analogue path. If you transfer audio digitally, you want to keep all of the resolution so that you can present to your DACs an optimally scaled signal. Isn't it what you're looking for?

We can talk more in detail about this if you wish, because it's indeed a tricky topic, sort of a brain-teaser.

Quote:
Originally Posted by jtwrace View Post
What about adding a poll?
I didn't think about it. Actually I'm not sure it's possible to add a poll within a thread, so I'd suggest we keep it simple and informal. As I said, it's just to help me in the process of ordering the chips and the PCB assembly. The CS3318 is by far the most expensive chip on the board: about USD 29 for a unit at Digikey, still USD 20 if you get 100 of them.

CS3318-CQZ Cirrus Logic Inc | 598-1180-ND | DigiKey

So far: analogue volume 2 vs. no analogue volume 0
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Old 29th August 2012, 07:12 PM   #204
jtwrace is offline jtwrace  United States
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So if one is going to use this as subwoofer managment for a Behringer DCX replacement without volume is needed. Correct? Each channel has a gain function. Am I correct?
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Old 29th August 2012, 10:19 PM   #205
chaparK is offline chaparK  Luxembourg
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Originally Posted by jtwrace View Post
So if one is going to use this as subwoofer managment for a Behringer DCX replacement without volume is needed. Correct? Each channel has a gain function. Am I correct?
I apologize but I'm afraid I don't understand your question. Each analogue out has indeed volume control - whether there's the chip (CS3318) installed or not. There's a master volume which is for all channels, and there's an individual volume for adjusting relative channel settings.
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Old 30th August 2012, 01:17 AM   #206
Shaun is offline Shaun  South Africa
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With analogue volume control for me.
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Old 30th August 2012, 05:26 AM   #207
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For me with analogue volume control
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Old 30th August 2012, 06:30 AM   #208
mvaldes is offline mvaldes  Italy
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I'll go with analog volume control.
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Old 30th August 2012, 07:17 AM   #209
ds23man is offline ds23man  Netherlands
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One board with Cs3318 for me!
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Old 30th August 2012, 10:11 AM   #210
chaparK is offline chaparK  Luxembourg
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Thanks all for your feedback!

So that makes now Analogue volume 6 vs. no Analogue volume 0

I didn't expect this, given that one can add the chip anytime if he feels the need (provided he's not afraid of soldering small pitch SMD).

The analogue volume chip has another benefit beside performing volume in the analogue domain. Indeed, it lets you set the nominal output level and hence supply an appropriate signal to your amp. Without the chip, the nominal output level is 1 Vrms.


Quote:
Originally Posted by jtwrace View Post
So if one is going to use this as subwoofer managment for a Behringer DCX replacement without volume is needed. Correct? Each channel has a gain function. Am I correct?
I read again your post and I saw the light this time

Now that I understood your question, yes I can confirm you're right: the board will perform nicely without the volume chip. The fact you're managing the signals to your loudspeakers elsewhere means that you have another way to control the master volume - so indeed you wouldn't need the expensive CS3318. Again, if you feel later the need of that chip because you've changed your system for example, you can just solder it on the board and it's automatically taken care of.
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