[morks]

Quote:

Originally Posted by amb /img/forum/go_quote.gif What more parts did you need? The parts lists on the websites should be correct. As for the connection from USB power line to the γ2 (with γ1 "D" config), you don't need more parts. All you need to do is to solder a wire to bridge the VBUS and VCC lines on the γ1 board.

I installed J1D, L4D, R(13|14|15)D, C(1|2|3)D and U1D as suggested by MisterX. If the thing with the jumpers really is mentioned somewhere on the site, I should have triple-checked it. Someone pointed it out to me, but it didn't work (bad joint somewhere else), so I thought that I needed to install those additional parts. Oh well, I now have the option to power the G2 externally.

 

[K3cT]

Quote:

Originally Posted by jc9394 /img/forum/go_quote.gif Any plans on the balanced out in the future?

You can probably hack a balanced connection out from the test points but it's going to be ugly and you will lose the final op-amp filtering.

 

[m1abrams]

Quote:

Originally Posted by K3cT /img/forum/go_quote.gif You can probably hack a balanced connection out from the test points but it's going to be ugly and you will lose the final op-amp filtering.

Couldn't you use the IVY board from Twisted Pair to get balanced out from the test points?

 

[Olli1324]

Mouser, RS, Farnell and Digikey are all out of SRC4192IDB.
I cannot seem to find AD1896AYRS for less than about 24 quid, which seems *extremely* expensive.

Any ideas?

 

[MisterX]

Quote:

If the thing with the jumpers really is mentioned somewhere on the site

Check the "Jumper settings" section of the Gamma 1 instructions page.

 

[Beefy]

Quote:

Originally Posted by Olli1324 /img/forum/go_quote.gif Mouser, RS, Farnell and Digikey are all out of SRC4192IDB. I cannot seem to find AD1896AYRS for less than about 24 quid, which seems *extremely* expensive. Any ideas?

Leave it out for now, and install it later

 

[MisterX]

Quote:

Originally Posted by Olli1324 /img/forum/go_quote.gif Mouser, RS, Farnell and Digikey are all out of SRC4192IDB. I cannot seem to find AD1896AYRS for less than about 24 quid, which seems *extremely* expensive. Any ideas?

SRC4192IDB - Texas Instruments - datasheet

or

SRC4192 192 kHz Stereo ASR Sample Rate Converter on eBay (end time 03-May-10 19:41:19 BST)

 

[Olli1324]

LOL new record for most expensive postage - one of those companies (avnet) want $47.99 for FedEx economy! for a chip hardly bigger than my finger nail...

Arrow also wanted 20 bucks postage.

That eBay one looks the most likely contender; although it is still about 8 squids more expensive than mouser/avnets prices...

Is the ASRC paramount to sound quality? Will I be kicking myself if I don't install it (yet)?

 

[m1abrams]

Quote:

Originally Posted by Olli1324 /img/forum/go_quote.gif LOL new record for most expensive postage - one of those companies (avnet) want $47.99 for FedEx economy! for a chip hardly bigger than my finger nail... Arrow also wanted 20 bucks postage. That eBay one looks the most likely contender; although it is still about 8 squids more expensive than mouser/avnets prices... Is the ASRC paramount to sound quality? Will I be kicking myself if I don't install it (yet)?

Well if you want to use any of the filters beyond the brickwall filter you really want to have ASRC since the other filters without the higher sampling rate will cutoff the high freq. Now of course the question is do the other filters make a difference, I personally hear no difference between them however a difference is clearly visible in Ti tests online just not sure if that will make an audible difference for you.

 

[m11a1]

Quote:

Originally Posted by MisterX /img/forum/go_quote.gif SRC4192IDB - Texas Instruments - datasheet or SRC4192 192 kHz Stereo ASR Sample Rate Converter on eBay (end time 03-May-10 19:41:19 BST)

What a great search engine, thanks for that!

 

[K3cT]

Quote:

Originally Posted by m1abrams /img/forum/go_quote.gif Couldn't you use the IVY board from Twisted Pair to get balanced out from the test points?

I think that's possible. Anyone crazy enough to try it out?

 

[mace1337]

It's not a far fetched idea at all, I'd say go for it.

 

[lampee]

Or somebody could build a balanced output stage from the datasheet of the WM8741 DAC chip. It would be probably cheaper than TPA's because you don't need the Balanced - SE converter. Good luck if anybody tries it!

 

[yeahyeah]

After a long search of parts, i find all parts i need and receive my board today.

Before building it, I want to confirm if DA chip on gamma 1 is not used, I can also omit these?
1. From R7D to J3D
2. U6D (looks like it provide 4.5V to U3D only?)

Quote:

Originally Posted by Olli1324 /img/forum/go_quote.gif Mouser, RS, Farnell and Digikey are all out of SRC4192IDB. I cannot seem to find AD1896AYRS for less than about 24 quid, which seems *extremely* expensive. Any ideas?

I find it on RS for HKD177, around 14.75 quid
and yes, it's double of SRC4192.........but i don't want to wait either


Now waiting for the oscillator C3391 from mouser, don't know when they're going to ship it.....

 

[slowpogo]

Quote:

Originally Posted by yeahyeah /img/forum/go_quote.gif Now waiting for the oscillator C3391 from mouser, don't know when they're going to ship it.....

You could just order the Abracon equivalent, which is in stock -

ACHL-24.576MHZ-EK ABRACON Oscillators