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Old 6th February 2011, 04:01 PM   #31
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Quote:
Originally Posted by ads2 View Post
I have just finished this temporary kit.... very disapointed.
sound loose a lot of detail. sound is more detailed on my Dac Zero using the integrated preamplifier (that don't use a HDAM on this stage)
I will take some photos of the bare board (the audio board, I don't care at all about his wacky controller backpack. that's a throw-away to me).

maybe I'm being harsh, but it looks like an idiot designed this board (that I got; the 6channel version). you can look at crystal or burr-brown and see their recommended ground planing and separation of digi and analog gnds. this guy who did the board I got followed NONE of that. deep sigh. where do they get off putting out such crappy products?

I'm glad I never intended to actually *use* this; I really just wanted a test-bed so I can write software for it, in general, before my own PGA board even gets built. to software, if the chip ACKS, you're golden (lol). the quality of the audio path does not matter - you can put mp3's in one end and if the volume varies out the other end, software is happy. but its sad that that's ALL it will be - a dev platform and not worthy of being depoyed in actual product. quite sad.
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Old 6th February 2011, 10:02 PM   #32
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Originally Posted by linuxworks View Post
...maybe I'm being harsh, but it looks like an idiot designed this board (that I got; the 6channel version)....
Yes. You have been spoiled with AMB's superb craftmanship...:-)
I only have the y1 board from AMB and I'm really impressed at the layout and workmanship.
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Old 6th February 2011, 10:05 PM   #33
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Originally Posted by Draki View Post
Tend to agree that e-baying from China is a high risk....
Well, you get what you see :-). I took a look at the photos in ebay and I would agree with linuxworks: lack of gnd plane, bypass caps far away, etc. Not a "serious" design, but it is all there for you to see...
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Old 6th February 2011, 10:14 PM   #34
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Quote:
Originally Posted by ads2 View Post
I have just finished this temporary kit.... very disapointed.
sound loose a lot of detail. sound is more detailed on my Dac Zero using the integrated preamplifier (that don't use a HDAM on this stage) than Direct RCA output using HDAM and with this kit.
LCD display is a real bad choice. White text on a blue background, at 2 meter I can't read it, nothing compared to my DIY CD transport with VFD display.
Will wait for LCDuino (or VFDuino) and a good PCB board for the PGA2311 to use with.
LCDs are very finicky with the contrast control. I don't know if your kit comes with an adjustment pot... I also like VFD displays but don't look good "naked". I put them behind a tinted glass/plastic. You can pick up a piece of tinting material from car shops and apply it to a piece of plastic or glass.

If your kit looks like the ones in the ebay pictures, some simple mods will improve the kit a lot: bypass caps at the pins, inputs and outputs at the dip holes connections next to the chip.

[I'm not trying to make excuses for the vendor, but now that you have it, might as well make the most out of it :-)]
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Old 7th February 2011, 12:55 AM   #35
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in fact, I was going to air-wire some local bypass caps (electrolytic and .1 of some kind, maybe film if I'm in the mood, lol) to each of the PGA chips. there are relays there that I may just jumper over (not that they hurt but i don't plan on using their input selector part). the power supply is dual 78xx/79xx and I'm thinking an offboard 317/337 would be a step up in quality.

on my board, they use a 10ohm R to separate digital + from analog + but I'd like to upgrade that to a ferrite at the very least.

the ins and outs (traces) are going all over the place so I'd airwire some jumper wire from the traces near the pins and put lots of twists on the wire pairs for better shielding.

also keep the clock/chipselect/data crap (lol) away from the analog stuff!

I think the board will work, electrically, but I'm not surprised its not great for clean sounding audio.

another pga kit that comes to mind is this one that I found a few years ago doing a remote-control search:

IRVC2 remote volume control with LCD

his is also NOT open source but I have more confidence in the layout on his. I would do the same thing: use his board as the engine and use another controller that is open source instead of his.
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Old 7th February 2011, 04:44 AM   #36
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Hi linuxwoks,

I did use that board about 3 years ago, before I switched to digital volume control inside the DAC. Good experience with it.
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Old 8th February 2011, 07:30 AM   #37
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linuxworks,
I have also been looking at the IRVC2 remote volume control with LCD
It has way to many inputs for me, but I really like the way he uses any remote (I can use my original Sony TV remote)
I talked to him about the IRVC, but I have decided to get the IRVC2 because the PGA chip(s) are on the same board to cut down on the clutter.


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Old 8th February 2011, 10:43 AM   #38
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the learning remote is a feature my code also has. its a nice feature that lets you go thru a dialog at config-time and store codes from any remote.

on mine, you press a config button within the first few seconds of power on and it goes thru a dialog: "press the up-arrow key" then "press down-arrow" and so on. after you hit each key as prompted, it saves the results in eeprom and stays until/unless you re-do the config.

the tauntek guy will not release his source, either (I asked him once a few yrs ago). so while it might be an ok board, you had better like the firmware as-is since you won't get any updates or changes.
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Old 8th February 2011, 03:29 PM   #39
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Check out the minivol, to see if you can integrate it into your
design. The analog and digital grounds are properly separated
and the PCB is really tiny.

MiniVol PGA2320 Volume Control - error404's Audio DIY Endeavours

I built a quick-n-dirty prototype remote controlled channel
selector and volume control using the MiniVol board and it sounds
excellent. It works great using a cheap ebay 4 channel RF
remote (nice and small, like a car keyfob remote).

My RF controled PGA2320 MiniVol and ch selector
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Old 8th February 2011, 04:34 PM   #40
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error404's minivol board works! I also hacked it to have it be arduino controlled instead of the small onboard controller. his layout was good and he followed the basic pga designs. 'showing up is 90% of it' as they say

is he still selling them? it seemed that he was not 'doing' them aymore last time I asked.
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