Doing a bit of cleaning I found an old gem: (sorry for the blurry pic)
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 😉
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 😉
Attachments
Last edited:
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
lingDAC - cost effective RBCD multibit DAC design
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
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
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
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
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
Patrick
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
Patrick
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 ?
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 ?
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):
http://www.diyaudio.com/forums/vendor-s-bazaar/255588-diyinhk-store-10.html#post4335382
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.)
Patrick
You can always upgrade the IV Converter to something discrete, like the SEN IV.
More info perhaps (post #476):
http://www.diyaudio.com/forums/vendor-s-bazaar/255588-diyinhk-store-10.html#post4335382
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.)
Patrick
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.
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.
Then just buy a Amanero and connect its I2S output to the PCM1704 converter board.
Amanero Technologies
Probably best solution there is.
Patrick
Amanero Technologies
Probably best solution there is.
Patrick
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.
IIRC, they also offer board without chips. Not sure about the availability though, the guy hasn't been active for a long time.
Thank you all for the tips so far 🙂
I've Emailed the HK guys to see if their solution is 'complete', sans the 1704's of course..
Good to know there are options, and within the EC no less.
I've Emailed the HK guys to see if their solution is 'complete', sans the 1704's of course..
Good to know there are options, and within the EC no less.
Got an Email back from the HKshop:
"This is a product for diyer to enjoy. It has limitless possibility." - emphasis mine.
"The store item description contains all the usage information and manual." - well, it doesn't.
With limitless possibility, I'll better stay away - I'm a sedate kind of guy...
Seems the 768khz module can only do 384khz, pity - original filter does 768k/channel (?)
Probably means the reference implementation of the output filter is off too.
I think I'll order the DAC board and take a look at it.
And the JLsounds converter looks a bit more universal...and cheaper
"This is a product for diyer to enjoy. It has limitless possibility." - emphasis mine.
"The store item description contains all the usage information and manual." - well, it doesn't.
With limitless possibility, I'll better stay away - I'm a sedate kind of guy...
Seems the 768khz module can only do 384khz, pity - original filter does 768k/channel (?)
Probably means the reference implementation of the output filter is off too.
I think I'll order the DAC board and take a look at it.
And the JLsounds converter looks a bit more universal...and cheaper
I believe there is a Borbely dac that uses those, a company in ca still makes them I’m pretty sure. Doesn’t look like they are selling any PCBs, however.
Those things used 8x1704K's !
I've got a dump off the B's site before he closed shop, ahh nostalgia 🙄
I've got a dump off the B's site before he closed shop, ahh nostalgia 🙄
Wow!
I didn’t notice that, would be quite the investment.
Here is the site for the company that may still be producing similar designs;
LBAudio Systems - Home
I didn’t notice that, would be quite the investment.
Here is the site for the company that may still be producing similar designs;
LBAudio Systems - Home
I havent heard one and dont know much but its affordable, available and the clocking looks cool from the propaganda below. Anyone know how it sounds?
Dan Lavry made a case for over-sampling benefits to max out about 90kHz with R2R chips so why go faster?
Last edited:
I'm confused, why are you posting a 'propaganda'picture of a AD1865 ?
...it's not even made by the same company 😕
...it's not even made by the same company 😕
Thanks for your reply. Sorry for any confusion in my brief post. Maybe I can try and make it a bit clearer.
As I wrote above, I dont know much and Im interested in building an R2R DIYINK DAC. So Im asking for advice about the sound of the DAC in general and the R2R DIYINHK "stop clocking" scheme in particular. There are some really great and helpful experts on this site. So is the stop clock thing a good idea or propaganda?
From the PCM1704 page
"The I2S reclock input circuit in this PCB is based on the Analog Device AN207 stop clock algorithm " and the image is from the DIYINHK site showing the stop clock idea for the AN1865, but I think its the same idea with the clock turned off after the data is latched in, so during the analogue output there's less digital noise? I've probably got that all wrong. 😱
Ahh, now I see what you are getting at - hadn't read that...😱
It's mostly gibberish on that site, but now that you mention this I'm even more reluctant to buy anything from there.
Will have to look around a bit more I guess.
Thanks for pointing this out 🙂
It's mostly gibberish on that site, but now that you mention this I'm even more reluctant to buy anything from there.
Will have to look around a bit more I guess.
Thanks for pointing this out 🙂
It is advisable to take some time to read those in detail before jumping to conclusions.
http://pdf.datasheet.live/1f49ce37/analog.com/AN-207.pdf
Stopped Clock Operation (AN-207)
Cheers,
Patrick
http://pdf.datasheet.live/1f49ce37/analog.com/AN-207.pdf
Stopped Clock Operation (AN-207)
Cheers,
Patrick