Which VCA for Digital volume control

[gmphadte]

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

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

[Havoc]

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.

[gmphadte]

I saw the site for CS3310 and it switches different Rf and Ri around an op amp.
That's Digital !!!...''

[UrSv]

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

[gmphadte]

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

[UrSv]

OK. So no VCA, digital pot or other special function IC then. Then I would simply go for relays and resistors.

[Havoc]

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

[gmphadte]

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

[gmphadte]

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