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Any project with PCM1704
Any project with PCM1704
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Old 20th July 2018, 05:34 PM   #1
kenta16807 is offline kenta16807  Sweden
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Default Any project with PCM1704

Doing a bit of cleaning I found an old gem: (sorry for the blurry pic)

Click the image to open in full size.
3xPCM1704, bought years and years ago for a project that never happened...


Anyone has an idea what they could be used for nowadays ?


or if anyone can demonstrate they have the skill to use them I'll send them away for free.
**Edit: I'll keep them for the time beeing**

Answers in the thread please.

@Mods, maybe should have posted in swap ? It's not like I want any payment other than getting
these chips to play music - like they were meant to
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File Type: jpg PCM1704K.jpg (236.3 KB, 1145 views)

Last edited by kenta16807; 27th July 2018 at 03:07 PM.
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Old 21st July 2018, 02:11 AM   #2
abraxalito is offline abraxalito  United Kingdom
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I'd be interested to try these out with my filter-I/V stage but I don't have the digital interface part set up, so I'd not ask you to send them to me But it would be interesting for someone to compare them with TDA1387 on the same analog output stage.


lingDAC - cost effective RBCD multibit DAC design
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Old 21st July 2018, 05:39 AM   #3
EUVL is offline EUVL  Europe
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Genuine PCM1704 is 80 USD each at Rochester Electronics (well-known authorised EOL IC dealer).
And that is not even K grade.
Rochester Electronics
: Part PCM1704U-J


So I suggest you post them at Swap Meet for at least 80€ each.
If someone would pay that (fair) price, he has some serious use for them.
You cannot drive them directly with I2S, but need glue logic or a digital filter chip like PMD100.

We have plans for them (we bought a bunch before they got obsolete), but no time yet to execute.
Or maybe you should keep them and do something with them afterall.
You won't find such nice sounding DAC anymore these days because they are just too expensive to make.
And 24/96 is more than enough for playing 16/44.1, unless you want to play 24/192 material, or above.


Patrick
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Old 21st July 2018, 06:34 AM   #4
gentlevoice is offline gentlevoice  Denmark
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Any project with PCM1704
Hi ... Just FYI the PCM1704 is likely capable of going up to 768 kHz/24 bits or there's a rumour that it will even do 1.536 MHz. This is with no oversampling.

If you decide to use the 1704 for a project - and maybe prefer a simple(r) setup - JLsounds USB-to-I2S directly offers the bit "shuffling" needed to align two channels so that external oversampling filters or electronic circuitry for this is not needed.

I2SoverUSB - I2S over USB Audio

Otherwise no affiliation with JLsounds ;-) ... And I otherwise have no experience with how this "USB" bridge sounds.

Cheers,

Jesper
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Old 21st July 2018, 07:22 AM   #5
EUVL is offline EUVL  Europe
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One of the problem is that he only has 3 pieces.
For balanced one needs 4 pieces.

Even if someone would build SE, there is one to spare.
What a waste it would be ......

For glue logic to I2S, take a look at this :
DAC with two PCM1704


Patrick


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Old 21st July 2018, 07:25 AM   #6
kenta16807 is offline kenta16807  Sweden
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Thanks,

I rather not sell them, I always seem to attract nutters when I try to sell something...

The only project I've found that I could have a remote chance of building is by DIYINHK:
PCM1704 R2R Isolated nonoversampling NOS Audio DAC with FIFO reclock - DIYINHK

...looks kind of sketchy though ?
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Old 21st July 2018, 09:23 AM   #7
EUVL is offline EUVL  Europe
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That is a reasonable one for I2S input.
You can always upgrade the IV Converter to something discrete, like the SEN IV.

More info perhaps (post #476):
diyinhk Store

If you want to use SPDIF input then maybe :
PCM1704 (PCM58P/PCM1702/PCM1704) DAC PCB - COMECEL

(Disclaimer: Have not tried any of the above and have no connections to either.)


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Old 21st July 2018, 09:40 AM   #8
kenta16807 is offline kenta16807  Sweden
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Thanks Patrick,

I got all my music transfered to PC, so I would need an USB DAC.

I'm quite happy with my old Lindemann DAC, but it's nice to try new things for sure.

I'll Email them some questions and see if I like the answers.
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Old 21st July 2018, 10:37 AM   #9
EUVL is offline EUVL  Europe
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Then just buy a Amanero and connect its I2S output to the PCM1704 converter board.
Amanero Technologies

Probably best solution there is.


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Old 21st July 2018, 11:27 AM   #10
thuanth43 is offline thuanth43  Viet Nam
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Something very nice is already here DSD with PCM1704
IIRC, they also offer board without chips. Not sure about the availability though, the guy hasn't been active for a long time.
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