Well that is pretty stupid to be a beta tester and it will cost around 1300 dollar to be that inclusive tax in Denmark.
Thanks. I will try the OPAMP stage when I have replaced the faulty capacitors on my stage. I have no stage at the moment - voltage out directly from the DAC to the amplifier. Looking forward to compare it to the OPAMP stage.
Hi Andrea, don't want to bother you too much, but do you have a suggestion for the optimal way of connecting the amplifiers to the DAC in this case (see above). Input impedance of my subwoofer amp is lower than input impedance of main amps.
Thanks.
+1
And a readable one of the DAC board - the one on ES9018 USB DAC - Hi-Resolution System is just too small to be useful.
What exactly is OFFSET? By any chance a reference of the DC offset of the DAC output?
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I do not consider myself an expert but... couldn't you just try to put a resistors in series for the low impedance amplifier. Like 47 kOhm or more. That would only work if the subwoofer amplifier has still enough headroom.
Hi MattMax & sipo75,
- I do not consider myself an expert but is there a sub crossover between the DAC output and the sub amp input ?
How did it come-out to be that much money for you? Do you have some very high import duties in your country?Well that is pretty stupid to be a beta tester and it will cost around 1300 dollar to be that inclusive tax in Denmark.
Unless I missed something, according to my calculations (including $170 for shipping) I have less than $900 into this for everything (so far).
$450 main Board
$60 op-amp boards
$90 Chassis
$20 transformer (this might be slightly off, I can't find the original number)
$60 Amero (with group discount)
$50 in other un-supplied parts (I chose the cheaper $2 a piece op-amps)
$170 shipping
= $900
Now that I add everything up, I must admit that this is a bit more than I had originally intended. But considering the design's flexibility, and very high-quality execution (on paper), that's still cheaper than most competitive units.
But the reason why I purchased this was because I specifically wanted a design which allowed one to easily experiment with various output stage topologies. No commercial products provide this option. I'm not really sure why somebody without any DIY intentions would have purchased what amounts to an untested kit.
To me its simply a foregone conclusion that anything this complex is going to have some bugs in the initial release. There's a reason why in the software industry we refer to this as being on the "bleeding edge" instead of the "leading edge". There is always some pain involved in being the very first adopters of any technologies which have been untested in the field.
FWIW: I have no affiliation with these either of the designers (other than being a customer like you guys). But I do have a lot of experience dealing with new technologies. And if you want for a brand-new design to be perfect right out of the box, then a DIY design is probably not the best choice for you.
I am reasonably confident that Quanghao and Audiodesign will get the initial bugs resolved given a little time. But they are a tiny operation which is probably run out of their garages. I'm sure that they can't afford to hire beta testers. So to me it is simply a given that that is part of what our role is here.
We purchased a kit (which is specifically being marketed on a DIY forum) with the potential to compete with products at roughly 5x its price point, and with completely unprecedented output-stage flexibility at any price-point. To me that's not a bad deal. If I wanted a unit to be flawless from the factory (but which will have some built-in performance limitations which this unit need not have), then I would have just purchased a Mytek. But even despite that unit having been marketed as a completely finished product, the early adopters of these units still had to update the firmware many times, and even had cut traces on their circuit boards.
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Hi TarnishedEars!
I am very grateful for the sincerity of your comments!
It is very important to me and Andrea. I will try to do what's best for the DAC and for your wishes.
When designing my DAC and Andrea were very much considered, and selecting combinations of components in different positions. Carefully considered many different treatment options.
I had to layout to 8 times, test, hearing test and measurement test, the DAC code must also be repaired by up to 45 times. All my efforts and Andrea are still many shortcomings, we will try to improve it, so that you have a perfect diy DAC as possible.
Do I like this DAC perfect from the first, so time was too long, so I hope people forgive my delay. And also grateful for the trust and expectations of all of you.
The contribution of your comments, please do not hesitate to tell me, I appreciate it!
again thank you all!
quanghao
I am very grateful for the sincerity of your comments!
It is very important to me and Andrea. I will try to do what's best for the DAC and for your wishes.
When designing my DAC and Andrea were very much considered, and selecting combinations of components in different positions. Carefully considered many different treatment options.
I had to layout to 8 times, test, hearing test and measurement test, the DAC code must also be repaired by up to 45 times. All my efforts and Andrea are still many shortcomings, we will try to improve it, so that you have a perfect diy DAC as possible.
Do I like this DAC perfect from the first, so time was too long, so I hope people forgive my delay. And also grateful for the trust and expectations of all of you.
The contribution of your comments, please do not hesitate to tell me, I appreciate it!
again thank you all!
quanghao
no matter the input impedance of the amplifier, you can use any amplifier for direct connection to the dac
you note, the DAC output with IV opam, I did not use the DC off set - because DC is set off virtual mass, so I do not like.
Just change the jumper and GND is unchanged
If you want to use the DC offset properly connect the points on the PCB (labeled DC off set)
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Quanghao:
Could you provide some explanation as to what the other jumpers on the main-board are used for? I'm specifically referring to the jumpers which are NOT used for selecting I/V modes.
Do these provide the ability to bypass the internal power-supplies and to substitute external DC power suppliers if we wanted?
Could you provide some explanation as to what the other jumpers on the main-board are used for? I'm specifically referring to the jumpers which are NOT used for selecting I/V modes.
Do these provide the ability to bypass the internal power-supplies and to substitute external DC power suppliers if we wanted?
What are all of the other jumpers used for on the DAC board? I'm asking about all of the jumpers which have voltages listed next to them on the board.
I'm confused as to what their purpose is. And I was speculating that these might allow for external power-supply options, such as a method to externally power the clock if we wanted.
That is the power supply for DAC, you should not care about its past, and not be drawn out of the jum
Today I finished welding shield for all of you, to invite you to view images.
Some of you do not pay the remaining amount, so you pay for me, please, for the next week I send all of you,
quanghao thank you
A.our list of unpaid invite you to help me:
select the form of transport and DAC to get my address to quote shipping
1. Javier Cobo
2. antony_shih
3. juju35135
4. i2k92
5. chansiukwing
6. linuxfan
B. You will receive complete DAC:
1. claudio52
2. Smoothquark
3. Myfavoritettthing
4. NicMac
5. Mattmax
6. gjorgji
7. Masterkey
let me just daaij and full telephone number. Thank you
Some of you do not pay the remaining amount, so you pay for me, please, for the next week I send all of you,
quanghao thank you
A.our list of unpaid invite you to help me:
select the form of transport and DAC to get my address to quote shipping
1. Javier Cobo
2. antony_shih
3. juju35135
4. i2k92
5. chansiukwing
6. linuxfan
B. You will receive complete DAC:
1. claudio52
2. Smoothquark
3. Myfavoritettthing
4. NicMac
5. Mattmax
6. gjorgji
7. Masterkey
let me just daaij and full telephone number. Thank you
Attachments
You will receive complete DAC
A. You will receive complete DAC:
And this is the complete picture dac, you see
some of you did not purchase USB, so you purchase or subscribe themselves from me, I will always fitting for you.
Thank you
1. claudio52. DAC Finis without USB
2. Smoothquark DAC Finis without USB
3. Myfavoritettthing DAC Finis without USB
4. NicMac DAC Finis without USB
5. Mattmax DAC Finis without USB
6. gjorgji DAC Finis with USB
7. Masterkey DAC Finis without USB
A. You will receive complete DAC:
And this is the complete picture dac, you see
some of you did not purchase USB, so you purchase or subscribe themselves from me, I will always fitting for you.
Thank you
1. claudio52. DAC Finis without USB
2. Smoothquark DAC Finis without USB
3. Myfavoritettthing DAC Finis without USB
4. NicMac DAC Finis without USB
5. Mattmax DAC Finis without USB
6. gjorgji DAC Finis with USB
7. Masterkey DAC Finis without USB
Attachments
- Status
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