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Old 15th April 2008, 06:12 PM   #1
cetoole is offline cetoole  United States
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Default Discrete I/V converter board

I wont have time to get this in one of my DACs for at least a week, and probably more like two, but I thought I would share this with you guys now. I just received a small box in the mail from PCBNet today, with the following inside.

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Click the image to open in full size.

They are prototype PCBs for the discrete I/V converter board I designed, to be used with current output DACs, especially of the multibit variety (PCM63, PCM1702, PCM1704, AD1862, TDA1541, ect). I currently own two DACs, an Audio Alchemy DDE v3.0 (PMD100 digital filter, dual AD1862N-J DACs) and an Adcom GDA-600 (DF1700 digital filter, dual PCM63 DACs). Both of these will be receiving one of these boards, replacing the entire analog output stage up to the output jacks. Each board is a SE stereo board, with onboard +/- discrete shunt regulators. Board measures 4"x3".

Board layout files and schematic below:

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Old 19th April 2008, 08:13 AM   #2
regal is offline regal  United States
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When you are replacing the analog stage on the AA DDE are you concerned about the length of wire from the DAC-out to your board?

Also do you have any extra boards you want to part with ?
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Old 19th April 2008, 06:18 PM   #3
cetoole is offline cetoole  United States
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Well, regal, I ordered 20 boards from PCBNet, for $225 shipped. I know I need 5 of them. I guess this means I may have a few left over. Email me if you want one.

As for the hook up wire issue, maybe I am not a good audiophile, but I just cant get worked up about an inch or two of wire in this situation. If I could, I would need to completely redesign the DAC (wait, maybe thats why I have four extra AD1862N-J and a PMD100 sitting here).
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Old 19th April 2008, 07:19 PM   #4
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Wow, this looks promising. Nice work as usual.
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Old 3rd May 2008, 11:31 AM   #5
regal is offline regal  United States
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Do you plan on sharing the values of the regulator resistors and how to dial in all the trimpots ?
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Old 21st May 2008, 01:58 PM   #6
cuibono is offline cuibono  United States
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Hey cetoole,

Progress update? Hows it sound!

I'm interested in a couple boards if they are available.

Is there a LPF somewhere (maybe on the output?)?


Patrick
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