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Old 27th August 2003, 11:36 PM   #21
mlloyd1 is offline mlloyd1  United States
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Default re: digital volume controls without internal buffers?

I think the DS1808 has no internal buffer either.
I was expecting more folks would play with this device and try different output buffering arrangements.

Even Hugh mentioned (possibly) playing around with this one

mlloyd1

Quote:
Originally posted by Freddie

Well.. One alternative is to forget about the PGA2310 and get an LM1972 instead. The LM1972 have no internal opamp, and should have a buffer at the output. Or run the PGA2310 without external buffer.
...
/Freddie
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Old 28th August 2003, 05:23 AM   #22
sonnya is offline sonnya  Denmark
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The problem with those digital pots is that there internal switches are not arranged in virtuel ground mode.....

The WM8816 , CS3310 and the PGA series are the best performers....

By the way Hugh have choosen a ordinary Potentiometer of high quality with a motor... based on listening test...

The datasheet is not available on the WM8816 on their sever... I think i have it somewhere... If anyone needs it i will see if i can find the PDF-file.
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Old 28th August 2003, 08:44 AM   #23
Freddie is offline Freddie  Sweden
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Default WM8816 datasheet

Here's the WM8816 datasheet.
http://www.kte.cz/data%20sheets/WM8816EDW.pdf

Maybe the PGA2310 is no good after all. However I've got some for free so I can just throw them away If I'm not satisfied with the performance.

The WM8816 looks interesting too. No internal opamp, so I can add an OPA627 or maybe a discrete Jfet opamp.

/Freddie
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Old 28th August 2003, 09:00 AM   #24
sonnya is offline sonnya  Denmark
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note that the WM8816 has a .001% THD from DC - 20KHz with a OP275 considered by many as a mediocre.

Look at figure 2. It has a very even THD over a wide input range.
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Old 28th August 2003, 09:05 AM   #25
Freddie is offline Freddie  Sweden
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sonnya, check your email. I have sent some that might be of interest to you!
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Old 28th August 2003, 02:21 PM   #26
Kay is offline Kay  Germany
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It's possible to find the datasheet on
http://www.profusionplc.com
too. This is an distributor for europe (EUR 4.699/1 piece)

best regards
__________________
best regards
Kay
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Old 13th February 2008, 11:09 PM   #27
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Quote:
Originally posted by Freddie
analog_sa,



Well, I usually think that it sounds better when I use separate powersupplies for each channel. And I have already built two powersupplies (designed by peranders). See the attached picture, the two powersupplies are on the left side of the picture.

HI Freddie

How was the power supplies wired?

How was the PIC connected and powered? Which supply was it attached to?

How was the grounds wired?

thanks
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