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kkchunghk 7th April 2006 06:19 AM

Is There Still Life For Ad1862
Hi fellas,

The spec. of the now obsolete AD1862 still looks impressive to me today. Having done a fine sounding dac with AD1865, I'm thinking of taking this on next, to compare with '65 if anything. Have searched the forum but found no schematic. I would do a nos version with the trusting CS8412 up front, AD827 as I/V buffer and OPA2134 low pass filter. I have not done a mono chip before and am not quite certain of the connections. My first guess is


These parallel to both AD1862 chips, no inversion.
Now is this worth a go or a waste of time? And have I got the connections right?



rfbrw 7th April 2006 07:20 AM

Should be ideal for those with one deaf ear.

kkchunghk 7th April 2006 07:50 AM

So it is wrong? Awful glad if you can point me the right way.

rfbrw 7th April 2006 08:30 AM

The AD1862 is a mono device. The CS8412 has a 2ch serial output. If you connect the two as outlined in your first post you will get the same channel in both devices.
You have to split the serial datastream into two simultaneous datastreams. There is a post on how to do it. Search for "nonos PCM1704" or something along those lines.

kkchunghk 7th April 2006 10:09 AM

Hi rfbrw,
Thanks for the key words. Found the two methods - shift registers and stop clock. I'll try the stop clock method first cause it's easier to understand.

Elso Kwak 7th April 2006 11:06 AM

Invert the Latch for one channel: one ear slightly more deaf than the other......
(sounds better than stopped clock)

rfbrw 7th April 2006 11:27 AM

I wouldn't take any notice of Merlin if I were you. He uses the TDA1543.

Elso Kwak 7th April 2006 12:22 PM


Originally posted by rfbrw
I wouldn't take any notice of Merlin if I were you. He uses the TDA1543.
Merlin? Who is that?


Elso Kwak 7th April 2006 02:55 PM

Now reckon this:
Mark Levinson (Madrigal) switched from PCM1704 to AD1853
Accuphase is using AD1853
Jadis is using AD1853
Lindemann : AD1853.
Benchmark: AD1853
Is there some consensus among high-end manufacturers?

ezkcdude 7th April 2006 04:48 PM

I was looking at maybe buying the AD1853 evaluation board. I know that's not exactly DIY, but it is only $167 (if you can find one).

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