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Looking for a new R2R dac chip (maybe make my own?)
Looking for a new R2R dac chip (maybe make my own?)
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Old 11th June 2018, 01:12 AM   #11
Tjj226 is offline Tjj226
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Quote:
Originally Posted by Ken Newton View Post
Another intriguing option is the still in-production 16-bit PCM56. This chip has been extensively tested and advocated by diyaudio contributor 'Bernhard', who claims that spectrum analyzer measurement reveal it exhibiting superior linerarity to about every other R-2R audio DAC chip, including those of greater bit depth (FYI - I do not have personal experience with the PCM56).

Although not exactly cheap (about $25 ea. in small quantities via Digikey.com and mouser.com) they are much less expensive than the currently in-vogue discrete R-2R modules. Again, the PCM56 is still in-production and readily available from those factory authorized distributors.

PCM56U Texas Instruments | Integrated Circuits (ICs) | DigiKey
Thanks for the heads up.

God dang it. It looks like I need to make a bunch of new dacs and see which one I like the most. Sorry wallet : P

I am still very tempted to buy a bench top multimeter and start hand matching some precision resistors to make my own ladder dac. I would never need to worry about parts being in or out of production and I could have better control over the sound quality.

But I am also looking at changing my IV stage. Right now I am using some 417as and they aren't the quietest things in the world. I am seeing 2mv noise floor just from the tubes lol.
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Old 11th June 2018, 01:28 AM   #12
ekidnah09 is offline ekidnah09  Australia
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Looking for a new R2R dac chip (maybe make my own?)
Why not keep an eye out for faulty cd players with the dac chip you need and buy one for the parts?
Could work out the same cost and you know the parts would be genuine.
I have bought DAC chips from an ebay seller in china, they worked.
He removes them from old equipment.
I am not sure if I can post the link here?
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Old 11th June 2018, 01:31 AM   #13
Tjj226 is offline Tjj226
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Originally Posted by ekidnah09 View Post
Why not keep an eye out for faulty cd players with the dac chip you need and buy one for the parts?
Could work out the same cost and you know the parts would be genuine.
I have bought DAC chips from an ebay seller in china, they worked.
He removes them from old equipment.
I am not sure if I can post the link here?
Cause I am not a CD player guru and I have no clue which cd players have which chips.

I do eventually want to build my own CD player though, sooooo that might not be such a bad idea.
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Old 11th June 2018, 01:44 AM   #14
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by miro1360 View Post
... you are talking that ebay AD1865 are fakes, actually they are not fakes - they are genuine and are digged out from old devices (during recyclation process), you can use DIP chips without problems
I have a question, how do you "fake" an AD1865 except by simply selling a rebranded same package random part. My idea of fake is a part that plugs in and functions like the original, almost. This is easy with op-amps and JFET's, far less so with DAC's and virtually impossible with ADC's.
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Old 11th June 2018, 01:51 AM   #15
ekidnah09 is offline ekidnah09  Australia
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Looking for a new R2R dac chip (maybe make my own?)
Well it looks like I can post the link here.

https://www.ebay.com.au/itm/1pcs-AD1...wAAOSwLe5auxHy

1PCS AD1865N-K Complete Dual 18-Bit 16 x Fs Audio DAC AD1865N | eBay

1 X AD1865R-J SOIC28 TO DIP24 Complete Dual 18-Bit 16 x Fs Audio DAC AD1865N-J | eBay

I have bought PCM63 and PCM1702 dac chips from this seller and they worked. The PCM63 were still on the board I removed them myself the PCM1702 were new.

You can also check his feedback.

For a list of cd players and their DAC Chips see this link, I think the AD1864 is pin compatible.

Hope this helps.
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Old 11th June 2018, 01:55 AM   #16
ekidnah09 is offline ekidnah09  Australia
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Looking for a new R2R dac chip (maybe make my own?)
Dac list didn't attach just search cd player dac transport list there are a couple to choose from.
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Old 11th June 2018, 01:58 AM   #17
Tjj226 is offline Tjj226
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Quote:
Originally Posted by scott wurcer View Post
I have a question, how do you "fake" an AD1865 except by simply selling a rebranded same package random part. My idea of fake is a part that plugs in and functions like the original, almost. This is easy with op-amps and JFET's, far less so with DAC's and virtually impossible with ADC's.
You silk screen a AD1865n-J (or worse) as an N-k, you sell a dead chip as working (which I have experienced), or you literally sell a fake chip (nothing in it) which I have heard about.
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Old 11th June 2018, 02:12 AM   #18
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by Tjj226 View Post
You silk screen a AD1865n-J (or worse) as an N-k, you sell a dead chip as working (which I have experienced), or you literally sell a fake chip (nothing in it) which I have heard about.
Different ideas of fake. What you describe is simply fraud, there are no cheap equivalents with poor specs that can be rebranded like op-amps and JFET's.
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Old 11th June 2018, 02:17 AM   #19
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by Tjj226 View Post
I am still very tempted to buy a bench top multimeter and start hand matching some precision resistors to make my own ladder dac. I would never need to worry about parts being in or out of production and I could have better control over the sound quality.
You can certainly hand match resistors with a 5 digit DMM but the bigger issue is one of temperature coefficient. As far as I'm aware the best resistors get to around 5ppm/oC. You might want to explore putting your R2R array into an oven to keep the values stable (I think Dan Lavry might have used an oven in one of his DACs, can't remember). You also have to ensure that soldering the resistor doesn't cause the value to change.

Quote:
But I am also looking at changing my IV stage. Right now I am using some 417as and they aren't the quietest things in the world. I am seeing 2mv noise floor just from the tubes lol.
Having just modified my own I/V stage (fed from TDA1387) I'd say this avenue is much more promising in terms of returns per hour spent than building your own R2R...
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Old 14th June 2018, 05:31 AM   #20
Alexandre is offline Alexandre
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Hi,

Call me crazy, but I donīt think these PCM56 are fakes. Not sure though. I didnīt buy any.

The seller also has PCM56 in other grades and procendences (korea rather than japan). I remember the experts on PCM63 discussing different grades and origin of chips here at diya.

-Alex

5PCS Audio D/A Converter IC BB DIP-16 PCM56P-K PCM56PK PCM56P-KG4 MADE IN JAPAN | eBay
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