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Old 4th October 2006, 02:16 PM   #1
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Question Simple Volume Attenuator IC Advice Needed

Hi,

have a small 5.1 homecinema project in front of me, I need now a simple attenuator IC for volume controll as I don't want to go with 6 ganged potentiometer because either they are expensive or in el-cheapo style not available.

Can anyone advise on an afordable IC that can be adjusted preferably by a adjustable ref voltage, the circuit don't have to be a really dedicated such for audio, maybe a suitable switch IC would do and a resistor ladder or so?

Oh, should mention it dosen't have to be a fine resolluting attenuator, 5-6 bit will do for my el-cheapo project, suggestions?

Cheers Michael
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Old 4th October 2006, 03:01 PM   #2
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Dallas Semiconductor makes some pot chips with built in controller so all you have to add is up/down buttons.

I_F
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Old 4th October 2006, 03:05 PM   #3
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Quote:
Originally posted by I_Forgot
Dallas Semiconductor makes some pot chips with built in controller so all you have to add is up/down buttons.

I_F
Dallas is now owned by Maxim -- not the magazine of course -- their digital pots are very easy to implement.
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Old 5th October 2006, 12:38 AM   #4
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Had a lookaround at Maxim's site and found a couple of circuits, the only 6 ch (64 position) found was a linear though I wanted a log, DS1806, it has to be controlled by some logic so maybe I will put a PIC into work. Cost at Farnell around 10.

Two other suitable ones were dual/stereo types with 32 positions, MAX5440, uses with a rotary switch makes it swift to put in use with nice "analog" feeling, and secondly MAX5456/5457, uses with push button makes them a bit boring. The drawbacks with these are that I have to use 3 in parallel...

Well, have to ponder my findings, but now it's bed time!
And please keep posting if any of you have suggestions.

Cheers Michael
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Old 5th October 2006, 03:31 AM   #5
Leolabs is offline Leolabs  Malaysia
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how about this:http://www.princeton.com.tw/webSite/temp/products.asp
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Old 5th October 2006, 05:13 PM   #6
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http://www.princeton.com.tw/ didn't work too well for me..

Cheers Michael
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Old 6th October 2006, 02:51 AM   #7
Leolabs is offline Leolabs  Malaysia
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Quote:
Originally posted by Ultima Thule
http://www.princeton.com.tw/ didn't work too well for me..

Cheers Michael
Why???
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Old 6th October 2006, 08:46 AM   #8
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Leo,

It doesn't come up, and now I'm sitting in front of a totally different PC on another location and still I can't open their homepage.

Cheers Michael
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Old 7th October 2006, 03:13 PM   #9
RussB is offline RussB  United Kingdom
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Check-out these puppies! I'm gonna give them a go myself!
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Old 7th October 2006, 03:13 PM   #10
RussB is offline RussB  United Kingdom
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Check-out these puppies (link included)

http://www.wolfson.co.uk/products/WM8816
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