Which VCA for Digital volume control - diyAudio
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Old 30th September 2004, 05:18 AM   #1
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Default Which VCA for Digital volume control

I have a thread in digital forum

Digital volume control w/rotory encoder (no MC)
http://www.diyaudio.com/forums/showt...297#post483297

and I could not get any answer as to which VCA for high end use


Quote:
You would be better served posing this question in the analog forum
May be this is the reason

So I am asking the question here.

any help

Gajanan Phadte
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Old 30th September 2004, 06:39 AM   #2
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A vca in not very "digital"

What about the CS3310: http://www.cirrus.com/en/products/pro/detail/P2.html
Simpler with a NE572

Or as someone suggested in the first thread, connect your counter directly to a relay attenuator. There are a couple of threads about that on the forum.
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Old 30th September 2004, 07:08 AM   #3
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Default Cs3310

I saw the site for CS3310 and it switches different Rf and Ri around an op amp.
That's Digital !!!...''
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Old 30th September 2004, 08:39 AM   #4
UrSv is offline UrSv  Sweden
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Why not DS1666 from Dallas. Requires no MCU if you don't want it.

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2747
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Old 30th September 2004, 08:58 AM   #5
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Default availability...

The aim of the design is to use standard industrial components not prone to obsolescence and should be available in most of the places.

Gajanan Phadte
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Old 30th September 2004, 09:01 AM   #6
UrSv is offline UrSv  Sweden
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OK. So no VCA, digital pot or other special function IC then. Then I would simply go for relays and resistors.
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Old 30th September 2004, 09:20 AM   #7
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I don't regards the CS3310 as digital. It takes an analog signal and does only analog "processing" on it. You signal is always in the analog design.

If you go with relays you make identicaly the same signal path, but instead of everything in an ic, it is in several components, and you replace the fet switches with relays. But it is the same basic circuit more or less.

If you want real industry standard components, then the relays are your best bet.

Next would be making a circuit with a "two quadrant multiplier". But this is going to be more difficult. And if you really want to do it, then you can even make the multiplier discrete. Take a look at the application notes of AD for those devices: http://www.analog.com/en/subCat/0,28...0%255F,00.html

Other idea, you could steer a led with your digital signal and couple this to a resistor in the feedback of an opamp. Simple and total separation between digital and analog.

Other possibility: http://www.national.com/pf/LM/LM13700.html
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Old 30th September 2004, 10:38 AM   #8
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Quote:
Other idea, you could steer a led with your digital signal and couple this to a resistor in the feedback of an opamp. Simple and total separation between digital and analog.
That's a good one.
Thanks

G. M. Phadte
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Old 30th September 2004, 11:21 AM   #9
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Default DS1666

Quote:
UrSv wrote
Why not DS1666 from Dallas. Requires no MCU if you don't want it.
I think you can connect a rotary encoder directly to this IC. Checkout

Gajanan Phadte
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