well, if one buys anything like this from eBay/Ali it should be clear that there is NO quality control as such. and what kind of QC one can expect on second hand chips? that they are not dead at best. in fact I am pretty pleased I have 2 good ones now. and instead of QC hifi-szjxic offers "Gurantee exchange if it is fault." I have contacted them, let see.
I would be happy to see there are measurements of AD1862 from China linked to a particular supplier. There are none. so now I would say there is 50% chance to get good one from hifi-szjxic. who knows are there better suppliers?
N-J is better in parameters - inaudible, but the old CD players is the only way how to get it, buy N version
my last order from him was Jan 06, 2020 ... I carefuly tested each chip from him and audibly everything perfect so far ...
tested and trimed from ears ? 😀
I will say what I hear from the Rochesters' I have vs the two new I have !
If anyone has an how to for measuring from a free soft and a soundcard I can also do that for the fun !
I will say what I hear from the Rochesters' I have vs the two new I have !
If anyone has an how to for measuring from a free soft and a soundcard I can also do that for the fun !
If people are interested in a relatively low cost solution for an ultra low noise PSU may I suggest looking here.VRDN: bipolar regulator PCB for line level ckts: ±11V to ±20V @ 1.5A with "De-Noiser"
There are some other designs in the main thread including my own but Mark Johnson's is probably the most complete design.
D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.
The denoiser seems to be able to compete with the best low noise psu designs with nothing but generic low cost parts.
There are some other designs in the main thread including my own but Mark Johnson's is probably the most complete design.
D-Noizator: a magic active noise canceller to retrofit & upgrade any 317-based V.Reg.
The denoiser seems to be able to compete with the best low noise psu designs with nothing but generic low cost parts.
That was the story 😀
But I'll do a recheck on some ADC when I find more time for it and I will post the results here 😉 (incl. source from where I got it)
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I've lots of experience of buying from Taobao and all the vendors I've complained to about sub-spec parts have accepted them back. I agree there's no hope of QC on 'pulls'.
I very much doubt there are 'better suppliers' - all the suppliers on Taobao are rather hit-and-miss. In general they don't know much about the parts they're selling (this conclusion is based on asking them questions and getting almost no satisfactory replies). But they're cheap and so no reason to stop using them.
You hit the point 🙂
That's what I'm trying to suggest all the time: Start cheap and if you will like it, there are no limits to further improvements 😀
You and me both eh? 😎
Sure, but there's cheap and there's cheap. AD1862 is expensive on Taobao compared to TDA1387. There's a ~46dB difference in the price. Now 1862 has 4 more bits to its credit but what about an array of 16 1387s controlled by a $1 CPU?😀
well then it's too cheap, it's too expensive...
If the starting point of a development that cost much is a cheap dac chip, then one should start from a good one. Old good chips are known : TDA1541A, AD1862 in the two first steps, many on the third step.
If the starting point of a development that cost much is a cheap dac chip, then one should start from a good one. Old good chips are known : TDA1541A, AD1862 in the two first steps, many on the third step.
The price of AD1862 is compensated by it's simplicity, in which it sounds like "wau".
It will be difficult to control an array of 16 dacs by a CPU - all from scratch .. only that you already have something done 😕
No, haven't done it yet but have been thinking about it for a long time. I started a thread here : Cheap ARM MCUs for RBCD audio
Hence the need to start from best chips... Well tda1387 is on the third step, not bad (second choice of Amr behind the TDA151A, because the Ad1682/PCM63 was hard to source...relaible stock I mean. Not Tabao, turn the wheel for the luck ! As Ebay as we saw ! throw the dices, the development can be good but not the heart : dac chip twilight zoned, lol.