Which buffer or preamp type to use; how to use PGA2311? - diyAudio
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Old 1st April 2006, 03:18 PM   #1
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Default Which buffer or preamp type to use; how to use PGA2311?

I'm currently working on Gainclone amp; the parts should get here soon.
However, I've heard that these sound much better with a buffer. A discrete transistor buffer (which is supposed to work very well) can be made for a few dollars using schematics on Decibel Dugeon.
LINK:
http://myweb.tiscali.co.uk/nuukspot/...nclonepre.html
I was curious, though; what is involved in using one of these with a PGA2311 digital volume control? I've got a PIC microcontroller (and programmer) handy, so control is not an issue.
However, I do have a few questions.
1. Voltage regulation.
Nuuk reccomends an elaborate discrete system with two seperate regulators per channel; the Kookaburra preamplifier (which uses a 2311) appears to use just one integrated regulator per channel, albiet at slightly different voltages. Which should I use?
2. Control.
The PGA2311 datasheet I cannot understand. Could someone explain how to control it? (I understand the use of the clock lead and serial lead to feed in the volume levels, and that's about it.)
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Old 1st April 2006, 09:15 PM   #2
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it needs to be controled by PIC or something like that
there is a kit caled kookaburra at www.twistedpearaudio.com that uses pga2311

if you look at the circuit you can see how it was done. theres a link to a thread on this forum instead of diagram on the site. i think its on page 36 or so
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Old 2nd April 2006, 06:53 AM   #3
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Quote:
Originally posted by neutron7
it needs to be controled by PIC or something like that
there is a kit caled kookaburra at www.twistedpearaudio.com that uses pga2311

if you look at the circuit you can see how it was done. theres a link to a thread on this forum instead of diagram on the site. i think its on page 36 or so
I know how it worls; it gets the data on the serial in line, which is based on the clock line. (standard serial interface, folks; nothing interesting there.) However, there are other funny lines that I don't understand how to use.
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Old 2nd April 2006, 06:57 AM   #4
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Quote:
Originally posted by Spasticteapot


I know how it worls; it gets the data on the serial in line, which is based on the clock line. (standard serial interface, folks; nothing interesting there.) However, there are other funny lines that I don't understand how to use.
you might consider looking at the kookaburra schematic to get an idea of how the 2311 is used.


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