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Old 18th January 2013, 02:17 AM   #121
qusp is offline qusp  Australia
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well I might be able to more readily if people didnt continuously quote me, asking questions or making incorrect assertions, then cry when its not what they want to hear.

abrax isnt included in that, he just does what he does and forced me to check detail, all good, frustrating but all good. he had something to add. cant say i'll ever need that exact snippet again, but hey.

Quote:
We were talking about issues in the ground plane which is a conductor (you know copper) and suddenly we jumped into n and p channels, semiconductor doping, electron, holes... What's the relation to the ground plane?
did you really just ask that again? it has something to do with their being solid state devices scattered all over that ground plane and the circuit functioning due to current/holes flowing between them. it is the new view on electron flow, which has EVERYTHING to do with this subject, 'ground' signal flow, all semiconductors etc.

specifically it means that the charged electrons are flowing FROM the broken ground plane to the dac, not the other way around.

read the ******* link!

but OK I get it, you just want to twiddle mindlessly

ive fixed the situation, you 2 specifically will not hear from me again

Last edited by qusp; 18th January 2013 at 02:29 AM.
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Old 18th January 2013, 02:28 AM   #122
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Quote:
Originally Posted by qusp View Post
...it has something to do with their being solid state devices scattered all over that ground plane and the circuit functioning due to current/holes flowing between them. it is the new view on electron flow, which has EVERYTHING to do with this subject, 'ground' signal flow, all semiconductors etc.

read the ******* link!

but OK I get it, you just want to twiddle mindlessly
So what? what is the implication to the ground plane? can you be a little more specific?
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Old 18th January 2013, 02:42 AM   #123
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Quote:
Originally Posted by qusp View Post
you didnt at any point explain a more correct view....par for the course...
Certainly par for the course that you'd misrepresent me I contributed the correction that its donors (donor atoms) that are being used to dope the semiconductor.

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but OK it seems carrier is just another name for hole aka charge carrier. if you actually read the whole post instead of picking a little bit to disagree with, you would see I had the correct gist of it, then linked to more knowledgable folks.
Again a misrepresentation (that I didn't read the whole post) - I agree with glt here, what does any of this stuff about conduction in semiconductors have to do with groundplanes?

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an extra electron, or one less electron charge has to come from somewhere, how do you propose they get the excess or lack of them into the implanted atoms? picking a hole in making a positively doped or negatively doped atom and implanting that, with adding or removing electrons is just argument for the sake of it
Its a good question which you can use as a springboard to learn something, I'm outa here

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can you ignore a thread?
Sure, just watch me
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Old 18th January 2013, 02:46 AM   #124
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Originally Posted by KlipschKid View Post
No, that's wrong.
LOL
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Old 18th January 2013, 03:09 AM   #125
qusp is offline qusp  Australia
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Quote:
Originally Posted by abraxalito View Post
Certainly par for the course that you'd misrepresent me I contributed the correction that its donors (donor atoms) that are being used to dope the semiconductor.
actually you are correct, I did misread you, but you were IMO picking on a pretty petty detail about a process I mentioned specificaly I didnt know very much about, since it was mentioned as novelty



Quote:
Again a misrepresentation (that I didn't read the whole post) - I agree with glt here, what does any of this stuff about conduction in semiconductors have to do with groundplanes?
the fact that all this travels across the board, thats all, in the post I already mentioned it luckily didnt really effect how things work, just the way we visualised the flow between them before was flawed. of course this will probably all change in a few years anyway. It was just by way of explaining that current flow isnt as neat as we would like, so just putting a wire under a resistor is not going to guarantee that the charge behaves itself and goes the way we would like it to go.


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Its a good question which you can use as a springboard to learn something, I'm outa here
nope, its really not

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Sure, just watch me
i'd rather not, but you are the only one left here now, so I guess it'll be deserted.

bye
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Old 18th January 2013, 07:40 AM   #126
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I just got the Amanero and do a quick test with the 99es9018
There is no listenable unlock issue at 192khz/BCK 12.288Mhz in power on default asyn operation mode for about one hour test. The es9018 onboard oscillator used is fox xpresso 100M from digikey.

but the two onboard adp151 regulator in amanero should have more input and output capacitor as told in hifiduino! my ear is pain when listening if no extra input and output capacitor is added. Four 1uf is parallel with an extra 10uf 0805 on top as in the image

Click the image to open in full size.

Last edited by diyinhk; 18th January 2013 at 08:00 AM.
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Old 18th January 2013, 07:50 AM   #127
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Hi Diyinhk,

My board is working too and I have lock and sound with a 22.5792Mhz clock and usb-i2s cm6631. I'll let it burn in over the weekend and then do some serious listening.

cheers

Tom
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Old 18th January 2013, 08:22 AM   #128
qusp is offline qusp  Australia
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perhaps (havent tested this) the default DPLL is 'best' meaning it will try settings until it has stable lock, rather than the very different forced 'lowest'.

that would be best for the users if its 'best'

I havent booted into default for ages and cant remember. both 'best' and 'lowest' appear to be indicated as defaults. it would be good if its 'best' for those not using any kind of controller, as it has much more relaxed requirements for the source jitter, but jitter rejection is not as good. glt probably knows this better than I as thats very much his thing. I know 'best' is default on Buffalo and from memory ackodac, but not sure if its the actual default with no controller at all.
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Old 18th January 2013, 09:10 AM   #129
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Hoping to build an arduino at some point but at this point, with the exception of the ground plane mod, I've built this as cheaply as possible. Plenty of time to try upgrades, settings etc. One problem I had was the Fox Xpresso 100Mhz osc - a pad came off with a leg. It seems they are far more fragile than the very similar Euroquartz XO91 parts. Anyway, here's a photo. Yes the table needs waxing. The amp is a Mini3, and I re-cabled the HD650 with Double Helix's UPOCC cryo wire. The DAC sounds very good even with the nasty thick film resistors, tl1963 reg, etc. If Diyinhk can make this easier to build then I think he'll sell a truck load of these DACs.

Click the image to open in full size.

One extra point - I used a bi-colour LED, red-white common cathode, it's red with no signal, white (or flashing white... that's cool) and goes pink when I pause. I used 470r resistors for this and it is plenty bright enough.
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Old 18th January 2013, 10:39 AM   #130
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A few extra notes.

I matched two 10K resistors - they both were 10.00K according to my Fluke - for the potential divider that feeds the op amps. With 4x LME49710HA in I/V, and the same (but MA on adapters) in the buffer, I get 1.2mV DC offset on the right and 0.2mV on the left. Awesome.

I mounted most of the larger caps on the top, as you see in the picture, because the op amps in sockets will be a similar height. I mounted the 100pF Wimas on the bottom. They can go on the top but I might want to bypass them if I try a current-feedback op amp in the I/V, and they are also the same height as the oscillator, so they don't add to the height of the board from the bottom or the top. Besides, everything on the top is blue or green or silver or black and that's more than enough colours, and the Wimas are red.

There are no markings for the cap polarity - remember that for single op amps, pin4 is negative voltage and pin7 is positive, so it pays to triple check cap polarity before switching on, as well as checking for shorts across power lines etc.

The Kubota reg that I bought on Ebay and modified for lower noise, has 19.5V across each smoothing cap form the 14-0-14 transformer. So the highest output I can get that's still within regulation is +/-13.5V.

The heatsinks on the Sigma11 have only risen slightly over ambient temp, but this is with a low freq clock. I need to test this with a 125Mhz clock and observe voltages, temperatures, etc, which Mr Fluke can do.

It's hard to give any impressions about sound quality with a Mini3 driving HD650 but I can certainly say this is not a crap DAC, like so much stuff on Ebay and Taobao is.

Have a great weekend all, I know I will...
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