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OLD THREAD DAC End by Andrea Ciuffoli

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#342
Hi all, got a question to the 3 DC powersupplies:
1. The output of Salas regulator is stated to be +5VDC (2 times) and -5VDC, the outputs are adjustable by three potentiometers. Ok so far!
2. The DAC board has local onboard regulators (7 pieces), based around TL431 shunt regulators. The TL431 has internal reference voltage of 2.5VDC, with the 2 pcs. 1kOhm resistors the output is set to nominal 5VDC. Ok so far!
3. The problem is that normally the input voltage of the shunt regulators should be higher than output voltage, e.g. input voltage 7VDC and output voltage 5VDC. The 2VDC would drop on the series resistor, and the TL431 shunt regulator will set the desired output voltage (5VDC) correctly.
4. So from my point of view the output voltage of Salas regulator should be increased, also the series resistors before the TL431 should be increased for stable operation. Exact values to be calculated.

Any comments?
 
#343
So from my point of view the output voltage of Salas regulator should be increased, also the series resistors before the TL431 should be increased for stable operation. Exact values to be calculated.

Any comments?[/QUOTE]

Forom Salas shunt = 5.1-5.2v In 7R 10Ohm to Tl431 about 4.97V for DAC.
You can use Trimmer adjust Vout!
 
#345
general registration list and the number of PCB DAC-end!

Hi all!
I would like general registration list and the number of PCB DAC-end!

If have any thing wrong, you can sent to me by e-mail: quanghao1689@yahoo.com.vn
thank very much
 

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#346
quanghao said:
Hi! i dont sell it ! but i show you on member you can by it:
The price i think is good!
Sieuthiav
SieuThiAV

SieuThiAV
Click to expand...

Hi!
These are the products I sell now, thank for quanghao introduced me, with CS8414 I still have some, the product was manufactured in China and I was trying, my opinion This product is good.

AD1865N-K - this product until now I have not much, this type of AD production company in the Philippines for a long time, I was checked it also and the quality very good.
Please feel free to contact me if you have any questions or comments!
 
#348
Forgive my ignorance. But I remember you said multiple times USD15 per board. So I cannot quite figure out why some people pays USD60 for a full set, and some 65 USD. And in particular, one guy has to pay 65USD for 2x Salas while another pays 36 USD.

All to complicated for me, but then it is also not my business, if the buyer does not complain.....

😉


Patrick
 
#349
Hi Patrick
you peace of mind! I do not get extra money a member has, without doubt, they will get the admit it. But this time I do not return because my Paypal locked. So all money is not in my hands. it can only be when all the members received PCB.

There are a number of PCB was awarded to friends write me here and I do not forget one of them!

You can see as an then I will easily get more than what each individual does not?
 
#352
quanghao said:
Hi all!
I would like general registration list and the number of PCB DAC-end!

If have any thing wrong, you can sent to me by e-mail: quanghao1689@yahoo.com.vn
thank very much
Click to expand...

As I mailed you here is the summary of my order :

1x DAC PCB
1x Salas Shunt Regulator PCB

Already paid by paypal.

As diyaudio is a public area, please don't show my real name in your general registration list. Thanks for correcting if possible

RTD
 
#355
numerik said:
Hello Quangho,

I tried to send payment for a full set of boards. I got a permanent failure when trying to reach your yahoo account.

numerik
Click to expand...

Hi! My paypal is limited now,

(We have received your documents. Thank you for your cooperation.

But we are sorry that your account access limitation cannot be lifted at
this time. We need more information.

***To resolve your limitation effectively, please provide all the
following steps in one time by logging in resolution center.***)

I dont get or sent money. If you need set PCb you can sent to acount my brother:

E-mail: chuong.doanvan@yahoo.com
Thank
 
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