D-AOC PCBs - the building and help Thread

[Audioman]

Hi Guys,
Anyone can explain me how to wiring the audio trafo between the bypass pcb and main pcb ??
please let me know
Thank you
Fabio

 

[ilfungo]

I doubt this mod will do any change to any timing, not in the LA4, not in the D-AOC, but what do I know.
compare it to the LA2 schematic, one part of this resistor is switchable - how is it labeled?

sorry [silent:arts]
I did not understand what did you tell me ...
What is the resistor switchable in LA2A?
R7?
Thanks

 

[Audioman]

Finally i finishing my D-AOC !!
posting some picture , the only problem is the gain reduction metering when the unit is set on link mode.
one channel seems to compress more than the other one
if someone solving this problem please let me know
Many thanks to Silent Art ,Kubi and all the people of this fantastic forum !!
Thank you all
Fabio

 

[Audioman]

second picture

 

[Audioman]

third picture

 

[envelope]

Here is a general and minor inquiry posed to the few members who have reported heat stress on the 2W 470R

Were you using Metal-Film resistors or Metal-Oxide resistors in those locations?

They should be Metal-Oxide.

Also, I have noticed, while checking over the PCB, that the  PSU heatsink mounting pads area all tied to the ground plane. This is not the case with any of the other boards I have used with these PCB mounted heatsinks. Can this effect the audio signal ground?, act as antennae?, transfer heat to other nearby components?, etc?

EDIT: thank you for the heatsink reply below volker..... from DIGIkey, I have these TO-220 kits, and also using thermal paste, I should be good to go....http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=keystone+TO-220&stock=1

 

[[silent:arts]]

I used Metal-Oxide with no heat problems

 

[Jonkan]

darn it, i think i might have film...

/J

 

[[silent:arts]]

Fabio,

the color scheme in your 2nd picture is wrong:

shouldn't it be

instead of

;D ;D ;D

 

[[silent:arts]]

... Also, I have noticed, while checking over the PCB, that the  PSU heatsink mounting pads area all tied to the ground plane. This is not the case with any of the other boards I have used with these PCB mounted heatsinks. Can this effect the audio signal ground?, act as antennae?, transfer heat to other nearby components?, etc?

oh, you modified your posting, missed the last question.
the heatsinks connected to GND won't affect the audio signal, won't act as an antenna, won't transfer heat to other components.
BUT it forces you to finally insulate your regulators properly ;D ;D ;D
(not often seen here in DIY land)
it is an educational thing

 

[Audioman]

Hi Wolker !!
Thank you for the banner !!
you are right i make a mistake with colors  ;D ;D ;D ;D ;D ;D ;D ;D
Like berlusconi with escorts ......  ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D

Fabio,

the color scheme in your 2nd picture is wrong:

shouldn't it be

instead of

;D ;D ;D

 

[ilfungo]

I just have to remove the transformer for unbalanced input?
thanks

 

[j.frad]

yep!

 

[ilfungo]

thanks  j.frad

 

[Blue Jinn]

Edcor XSM 10K: 10K

how can I calculate it?

thanks

Found this thread:

http://edcorusa.com/boards/t/179/xsm-10k10k-correct-resistor.aspx

 

[ilfungo]

Hello everyone
now I understand how DAOC  sounds really  .....
I removed the transformers in and out and I discovered that my problems came from them ....
Can you advise me what can I use for the electronic balance?
Thanks

 

[Audioman]

For mine i used sowter

INPUT SOWTER 8540
OUTPUT SOWTER 1010

they cost a lot ..... but it sounds good !!

 

[ilfungo]

sorry
which model Carnhill Transformer can be used as output?
Thanks

 

[syn]

VTB2291

 

[ilfungo]

thanks syn

Have you tried?
someone has tried them?
Lundhal as input
Carnhill output?
Thanks