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Old 7th June 2012, 09:18 AM   #111
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by unixdeveloper View Post
All -

Updated GB List with errors fixed.

-Subbu
Hi Subbu,

Just to confirm our PMs and so i don't miss out, have i been added to the list?

Will/have details been provided for payment?

Looking forward to playing with this.

Cheers!

Ryan
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Old 7th June 2012, 06:45 PM   #112
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Quote:
Originally Posted by massimo View Post
Subbu, JeanPaul, are you going to provide a schematic after the bom?
We decided to send the schematic only to the participants since it has no use publishing it here. We have to deal things efficiently as we slowly realize what time this project took and will take. Of course we will try to support problems (but not generic stuff) of the people that bought a PCB + chip and we narrow it down to that group because we are a lousy bunch of egoists You will receive the schematic if you are a participant of the group buy.
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Old 7th June 2012, 06:54 PM   #113
massimo is offline massimo  Italy
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Very good, thank you!

(Yes, I'm in the GB)
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Old 7th June 2012, 07:23 PM   #114
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OK Massimo, do you know what power supply is needed ?
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Old 7th June 2012, 07:44 PM   #115
massimo is offline massimo  Italy
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Ummmm... let me think....
I guess 5VDC/250mA
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Old 7th June 2012, 07:48 PM   #116
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That is an incredible good guess, congratulations. I guess you have spiritual capabilities in the family ?

It may be a wise thing to build/arrange/borrow or steal (no don't do the latter) a power supply for the DAC. It will kill the time and things will be ready when the PCB arrives. A nice case will be handy too. Exaggeration is a bad thing but trust me that this DAC is a stayer and it deserves a nice case. Do you happen to know what a good case for the DAC is made of ?
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Old 7th June 2012, 07:57 PM   #117
massimo is offline massimo  Italy
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You read in my mind!
I was just wondering if that nice split bobbin 9+9V/10VA xfrm I use as paperweight on my desk will fit for purpose....
And I have some ideas for a suitable slim case too! ;-)
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Old 7th June 2012, 08:04 PM   #118
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That is a suitable transformer but a somewhat lower voltage would be nice (or coil in front of the first filter cap ?). Parallel the secondaries and find a nice regulator PCB with it. With your spiritual capabilities you will already know that the 7805 is not the best of the lot (I was reading your mind again). LM317 based power supplies are better and the good old 723 is one of the better in terms of noise and it can feed the DAC without pass transistor. My original plan was to make either a 723 based supply or a passive one with a 3V transformer, rectifier and very large caps + common mode coils + beads etc. A 3V transformer will give 4V or more at this load which should work out OK.

Anyway an OnSemi MC7805CTG based power supply should suffice as there are 4 good on board regs but since there is nearly no difference in price or complexity there is almost no excuse not to build a better supply.
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Old 7th June 2012, 08:13 PM   #119
massimo is offline massimo  Italy
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I wish I had a 6+6V Xfrm! But this piece of iron is laying around since months.
Reg: I have some LM1084s somewhere.... The LM723 requires too many components for my taste and possibly a pass BJT (>150mA)
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Old 7th June 2012, 08:31 PM   #120
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Come on, LM723 only needs 6 external components and the DAC only consumes 50 mA to 70 mA (when you decide on a 50 MHz Fox oscillator) so no pass transistor. Maybe just maybe when you ask Subbu in a polite manner then maybe just maybe we can make a nice LM723 based power supply PCB. Don't tell him I gave you the idea, OK ? I kind of like the "new meets old" feeling of the WM8804-ES9023-LM723 combination. No rational explanation except for the very low noise of LM723 (2.5 uV !!!).

LM1084 is more noisy than 7805.....it is a 5A reg which seems overkill too.
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