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Old 27th March 2011, 03:50 PM   #101
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rmaa results:

RightMark Audio Analyzer test : volumaster PGA 20110326

one of the graphs:

Click the image to open in full size.
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Old 28th March 2011, 04:53 AM   #102
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Nice job !

You definitely made the right choice re the relays etc. Excellent results !

So how does it sound ? Mine is virually transparent below 0dB with just a little image confusion over a pass through. Perhaps yours is fully transparent ?

Cheers
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Old 28th March 2011, 05:08 AM   #103
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I won't ever consider myself golden ears. I'm a lousy piece of test gear

to me it sounds as good as the source. but I rely more on test gear; it does not care and has 'no dog in the fight', as they say.

we did one test at 0db and another at 3 or 3.5db (in the plus region). if anything, it was BETTER at the +3db (gained) setting. blew my mind
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Old 28th March 2011, 05:50 AM   #104
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Hi,

hehe...yeah....I notice you have stopped the POS comments ! ;-)

It does make me wonder what it could do with a decent PCB, power etc. It might just be all I ever need for volume control.

Anyone out there fancy doing a pure stereo in-out layout with onboard Salas shunts for a group buy ? You could count me in for 5 at least.

Cheers

Tom
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Old 28th March 2011, 06:16 AM   #105
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we have not started development, but amb and I do have plans to develop and produce boards for the PGA vol control engine. it will fit into the system as an alternate choice: relays for those that like relay-attenuators and PGA for those that prefer that style of vol control. the delta1 and delta2 are planned to be regular stock items and I would think the PGA equiv would, also.
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Old 28th March 2011, 06:20 AM   #106
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Quote:
Originally Posted by KlipschKid View Post
Hi,

hehe...yeah....I notice you have stopped the POS comments ! ;-)
I think the dialog was something like 'hey, the results just completed. its clean.'

'its clean??'

'yeah. looks good.'

'can't be. really? come on!'

or to that effect

we were both a little surprised.

I did a perf board PGA project a year or 2 ago and we did a test run, then, too. that version tested better, actually, but only on paper. I doubt a single person would be able to reliably tell them apart. and my perf board version was at least attempting to follow all the guidelines with digital and analog grounds touching at the right place as per the spec sheets and so on. I did have all the right bypassing and a more 'remoted' PSU unit (nowhere near the PGA). I think I also used a TLE rail splitter to get my audio ground and I gave that a nice clean 10v, having it create the dual 5 (or really just create a really accurate midpoint). so with lots of extra effort you can get slightly better on-paper specs. I doubt its worth it unless you need bragging rights.
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Old 28th March 2011, 06:29 AM   #107
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I've been following this stuff very closely and would love to beta test such a board, should it ever happen...

Hey linuxworks, have you got a schematic for how you've implemented the pga through the port expander? I'm going to bread one up for when I get my lcduino board later on.
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Old 28th March 2011, 07:02 AM   #108
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no schematic yet; this all happened too fast for that; it went direct to perf board

the PE is basically the same as what you'd find on amb.org's site for the delta1 or 2 controller. just half of that board since you don't need 2 PE chips.

then, the bottom 2 bits are the data bits (clock and data) and I used the next 3 bits as chip-enable bits for 3 possible chips. in reality, I always send a 111 to them and they might as well be the same wire, but just in case I want to address one chip on its own, they are all bit addressible.

there is a mute bit, too.

maybe this is useful:

Code:
// mute wire
#define PGA_I2C_MUTE_HIGH   B00100000
#define PGA_I2C_MUTE_LOW    B00000000

// chip-select wire
#define PGA_I2C_CS          B00011100
#define PGA_I2C_CS_HI       B00011100
#define PGA_I2C_CS_LOW      B00000000

// data wire
#define PGA_I2C_SDATA       B00000010
#define PGA_I2C_SDATA_HI    B00000010
#define PGA_I2C_SDATA_LOW   B00000000

// clock wire
#define PGA_I2C_SCK         B00000001
#define PGA_I2C_SCK_HI      B00000001
#define PGA_I2C_SCK_LOW     B00000000
I will also have to shoot a pic of the underside of that gold pcb. I had to do some rewiring and jumpering to get all the needed ce/clk lines to appear on one header block. they had them spread out onto another header and I didn't see the point in that, really.
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Old 28th March 2011, 08:29 AM   #109
Bonsai is offline Bonsai  Taiwan
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Great result Linuxworks. I am currently working on a PGA2320 based pre-amp. The audio and control s/w is running well (I am writing the TFT display driver now - still some weeks to go). Anyway, I can listen to the pre-amp part and It sounds superb, so I don't doubt you have a fine sounding piece of gear there. The PGA2320 is a great device and its good to hear people getting these kind of results. I am buffering mine on the input and output side as well.

BTW, what sound card are you using?
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Old 28th March 2011, 02:38 PM   #110
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we used the m-audio firewire RME box for rmaa testing.
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