Denon DA-500 mod (after PCM1702 DAC I/V resistor?)

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Posted by Fedde Bouwman on March 23, 2002 at 18:05:08

Today I was looking again in my Denon DA-500 DAC and was thinking: there must be a better output circuit possible than the one with the 4 used opamps. (I use 2xAD825 for I/V and buffer, OP275 for GIC filter for whatever that means :-) The sound is not *really* bad, but at least too bright.

I saw the posting about using only 1K resistor at the output of the PCM1702. I wonder what happens with all the high frequency (>22K) information at the output of the DAC ? Is it smart to send everything directly to the amp. (I use a Harman Kardon HK690)

As a second option, I would like to make an I/V converter with the AD825, and also an output buffer. Can I safely keep out the filter? What surrounding components do I need? I do not want to spend too much money because I will probably build a TDA1543 TNT dac soon...

Thanks in advance for any reply...

Fedde Bouwman
The Netherlands

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Topic - Denon DA-500 mod (after PCM1702 DAC I/V resistor?) - Fedde Bouwman 18:05:08 03/23/02 (18)

Re: Denon DA-500 mod (after PCM1702 DAC I/V resistor?) - Spartacus 10:37:42 03/24/02 (0)

1K is a bit too high for I/V resistor - Dave I 08:14:40 03/24/02 (16)

Re: 1K is a bit too high for I/V resistor - Fedde Bouwman 09:27:34 03/24/02 (3)

Re: 1K is a bit too high for I/V resistor - Dave I 11:21:51 03/24/02 (2)

Re: 1K is a bit too high for I/V resistor - Fedde Bouwman 13:59:20 03/24/02 (1)

Re: 1K is a bit too high for I/V resistor - Fedde Bouwman 15:54:41 03/28/02 (0)

Re: 1K is a bit too high for I/V resistor - Spartacus 09:24:28 03/24/02 (11)

Try this one instead ... - Dave I 14:29:15 03/24/02 (7)

Re: Try this one instead ... - Spartacus 11:06:45 03/25/02 (3)

Re: Try this one instead ... - Just a thought ... 11:17:40 03/25/02 (2)

You could, but .... - Dave I 11:54:35 03/25/02 (1)

Re: You could, but .... - Spartacus 13:01:38 03/26/02 (0)

Great discrete I/V stage! How about using OPA660 from BB? - banana 03:10:35 03/25/02 (2)

How about using OPA660 from BB? - Dave I 07:06:34 03/25/02 (1)

Re: How about using OPA660 from BB? - banana 08:33:07 03/25/02 (0)

Current mirror I/V design - Dave I 11:10:24 03/24/02 (2)

Re: Current mirror I/V design - steve jones 15:03:08 03/24/02 (1)

Re: Current mirror I/V design - Dave I 17:49:20 03/24/02 (0)

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