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OLD THREAD DAC End by Andrea Ciuffoli

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E

Ekkeri

Member
Joined 2008
BOM has at least one little error: Only 13 green leds for Salas, should be 15?

Few smaller mistakes which are easy to spot @ DAC End: R28 is R26 in the schematic, and there is C18 47uF/6.3V cap, should be C17. Didn't find any other when rechecked my BOM, I think I should have all the parts figured out now, if schematics & boards matches.. (and if there isn't any other errors) :)
 
A

audiodesign

Banned
Joined 2005
***********************************************************
* In my pcb of the Salas board there was a little problem.
*
* The output of single +5v was in short circuit.
*
* To resolve it is necessary make a little cut of the wires, see photo.
*
* In my case this problem has not destroyed the components but
* please check before switch on.
*
************************************************************
 

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A

audiodesign

Banned
Joined 2005
This evening I have finished to assemble the power supply modules.

I have found only the value 200ohm of the trimmer instead of 220ohm so to get 6.3v I have put in parallel to the R11 1Kohm 1% resistor a 2Kohm 1% to get a value about 700ohm.

Prabably I will change the R1 22K 2w with a lower value to increase a littel the power supply voltage.

I am using a 250V ac for the anodic power supply.
 
apelizzo

apelizzo

Member
Joined 2006
adamus said:
checked my board, no short so must be a slight fab issue.

I am only using 230v AC so will probably have to further decrease 22k, or settle for a slightly lower B+ which shouldnt be too much of an issue.
Click to expand...

I already tried with 230VAC. It's not enough. I rejected it as there is not enough headroom for regulation, so you will see the ripple ~~ :(
You need at least 250 and change the 22K resistor value.
For good regulation I aim to keep Vds around 50V.
 
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apelizzo

apelizzo

Member
Joined 2006
===============================================
-- a t t e n t i o n ---x short

possible short circuit on Salas board

check twice for the short
under screw terminal +5 Digital output

===============================================

Thanks Audiodesign!
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