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Old 8th February 2011, 06:21 PM   #41
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Quote:
Originally Posted by linuxworks View Post
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.
Is there any "open-source" options that is similar?

Thanks

By the way,
I checked out your flicker feed and you got some great projects.
It was interesting to read about the netbook hackintosh.
I didn't realize how easy it was for some netbooks.
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Old 8th February 2011, 07:07 PM   #42
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my project will have its source released. working on it now, getting real close to release as it is.

GLT also has a lot of arduino source for hi-fi things.

the minivol was open source, too, but it was rotary encoder, only, no IR and no display.

the source based ones are definitely in the minority, that's for sure. I have not found a single chinese based one that is open source. in fact, its common to scratch numbers off chips, so I would never expect the imports to have opensource on software. it seems they like to take but not give ;(
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Old 9th February 2011, 03:57 AM   #43
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my project will have its source released. working on it now, getting real close to release as it is.
Can you tell us what features your project will have?


Thanks,
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Old 9th February 2011, 04:57 AM   #44
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there's a lot to read about

start here, perhaps: AMB Laboratories DIY Audio • View forum - LCDuino System

a working example is the 'a10 preamp' on amb's site; that gives a general idea although it does not talk too much about the software, just the hardware.

I think there are some unique features, such as x10 'firecracker' remote support: this is the x10 powerline on/off switches and I've integrated code so that you can turn amps on and off with no wire mess (nice for sleep timer, lol). it has a learning Ir remote on the receive side, user settable port names, up to 8 ports on the i/o board that you can 'punch down' to either input bus or output bus, there is a unique window control ('clip window') that lets you define the min volume and max volume on a linear track pot and the volume stays inside that range (plus the pot has full travel in that narrowed down range). user defined brightness levels, user defined mute levels, last-remembered vol for each input/output path, new support for lcd/vfd, realtime clock/calendar with battery backup, support for various lcd sizes (2x16, 2x20, 4x20), front panel 'resistor buttons' for alternate input to IR remote. those are the highlights that come to mind but I'm sure I forgot quite a few.
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Old 9th February 2011, 06:13 AM   #45
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Quote:
Originally Posted by linuxworks View Post
there's a lot to read about

start here, perhaps: AMB Laboratories DIY Audio • View forum - LCDuino System

a working example is the 'a10 preamp' on amb's site; that gives a general idea although it does not talk too much about the software, just the hardware.

I think there are some unique features, such as x10 'firecracker' remote support: this is the x10 powerline on/off switches and I've integrated code so that you can turn amps on and off with no wire mess (nice for sleep timer, lol). it has a learning Ir remote on the receive side, user settable port names, up to 8 ports on the i/o board that you can 'punch down' to either input bus or output bus, there is a unique window control ('clip window') that lets you define the min volume and max volume on a linear track pot and the volume stays inside that range (plus the pot has full travel in that narrowed down range). user defined brightness levels, user defined mute levels, last-remembered vol for each input/output path, new support for lcd/vfd, realtime clock/calendar with battery backup, support for various lcd sizes (2x16, 2x20, 4x20), front panel 'resistor buttons' for alternate input to IR remote. those are the highlights that come to mind but I'm sure I forgot quite a few.
Sounds like it is going to be sweet!
I can't wait.
Thanks for the details...
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Old 11th February 2011, 03:42 PM   #46
Draki is offline Draki  Macedonia
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Default 6-ch volume

Received the product (as per link posted in post #25, page #3).
The boards are not bad at all, nicely made, dual-sided, clean, Elna and Nichicon caps, TI 5532Ps, tantalum bypass caps.
What's not visible on the pictures is the volume chip (on the bottom side): it is Mitsubishi M62446FP.
Did not connect yet. Hope it works.
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Old 18th February 2011, 03:00 AM   #47
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Hey Draki,

Let us know how well that 6 channel volume control works - I'm very curious ! Do the tone controls work ? The specs don't seem as good for Mitsubishi chip as the Ti PGA2311 but specs never tell the whole story eh ?

Anyone come up with better firmware for the PGA ?

cheers

Last edited by KlipschKid; 18th February 2011 at 03:03 AM.
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Old 18th February 2011, 06:40 AM   #48
Draki is offline Draki  Macedonia
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I tried the 6ch-VC for a brief period only (one hour or so)- mainly to check the inputs/outputs. The 6VC works OK, no noise, yet to be listened critically - first will have to finish the case and install properly.
The first feeling is "not bad" (for the money).

The tone controls do NOT work. Only the levels.

Last edited by Draki; 18th February 2011 at 06:46 AM. Reason: Addition:
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Old 23rd February 2011, 01:46 AM   #49
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this is the kit that I got. no real docs so I had to ohm-out the board myself.

here's a key, hope its useful to someone other than myself:

Click the image to open in full size.

cs are chip-select lines. clk are clock lines.

note that 'dat' is common data line to all 3 chips.

k1-k3 are the relays for input selection (transistor driven).

vcc and gnd on the bottom row are for the 'remote processor' board (on the lcd). this is driven by the 3rd (lower left) 7805 regulator. if you don't need to power a remote controller cpu board then you only need the top 2 7805/7905 regulators for the analog rails. the digital 5v is 'derived' via 10ohms from the analog +rail.

inputs would be via rca jacks on the top and analog outputs are on the bottom row.
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Last edited by linuxworks; 23rd February 2011 at 01:51 AM.
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Old 28th February 2011, 02:07 AM   #50
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Hi,

Thanks for posting that.

Your board looks like it'll do 5.1 ? I took the plunge on a 2 channel kit - I chose it because the kit comes with an A grade PGA chip and has an eeprom to remember settings. I'm most of the way through building it but am waiting on other things before I test it.

PGA2311 preamplifier remote volume control Rowland ! on eBay (end time 01-Mar-11 14:31:23 GMT)

No ground planes, the digital supply is shared with the analogue via 10r, both the analogue and digital share their gnd, and there's no decoupling near the chip either, so it isn't anywhere near what Ti suggest on their datasheet. Hey ho.

Thankfully it should be simple enough to hack the board and give an independent 5v for the mcu and another for the digital side of the PGA, and also easy enough to add local decoupling underneath.

On the plus side, all the caps were decent ( I only changed the post-reg caps to Panasonic FM 1000uF and the signal input coupling caps to BG NX HiQ with Vishay MKP bypasses), the regs are ON semi 7805 which, although 7805, are about as good as they get for noise, ripple rejection etc from a 7805, and the chip is A grade, so the kit is pretty good value for money. Such a shame about the board really.

One thing I can't fix are some of the pcb traces running near the PGA but I'm hoping this will only be a minor handicap and not appreciable in listening tests.

So it should be able to perform well enough despite the board's shortcomings.....I hope.

The seller was great - full marks to Stanton for his English and his willingness to to email me promptly, which I've needed as the instructions were little better than copying pictures.

One curious thing is the rectifiers - little grey and blue balls. Any idea who and where makes these and what their specs are ? Russian ?

Tom
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Last edited by KlipschKid; 28th February 2011 at 02:17 AM. Reason: add images
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