Discrete I/V converter board

cetoole · 15th April 2008, 06:12 PM

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.

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:

regal · 19th April 2008, 08:13 AM

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 ?

cetoole · 19th April 2008, 06:18 PM

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).

MrMajestic · 19th April 2008, 07:19 PM

Wow, this looks promising. Nice work as usual.

regal · 3rd May 2008, 11:31 AM

Do you plan on sharing the values of the regulator resistors and how to dial in all the trimpots ?

cuibono · 21st May 2008, 01:58 PM

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

15th April 2008, 06:12 PM	#1
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	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. 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:

21st May 2008, 01:58 PM	#6
cuibono diyAudio Member Join Date: May 2006 Location: City of Angles	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 __________________ double complete rainbow all the way!!

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19th April 2008, 08:13 AM	#2
regal diyAudio Member Join Date: Jan 2004 Location: MD	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 ?

19th April 2008, 06:18 PM	#3
cetoole diyAudio Member Join Date: Mar 2005 Location: Maryland, USA	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).

19th April 2008, 07:19 PM	#4
MrMajestic diyAudio Member Join Date: May 2007	Wow, this looks promising. Nice work as usual.

3rd May 2008, 11:31 AM	#5
regal diyAudio Member Join Date: Jan 2004 Location: MD	Do you plan on sharing the values of the regulator resistors and how to dial in all the trimpots ?

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