D-AOC PCBs - the building and help Thread

[ilfungo]

guys help ....
I have a strange problem
when I connect the + and - to relay board 24V  disappears
I have no problem if I connect only lamps vu meter to 24V
any ideas?

 

[wolfgang]

maybe you connected the relay board at wrong polarity??
Try to swap + and at the relay board.

regards,
wolfgang

 

[ilfungo]

I have checked the polarity
The strange thing is that by measuring the continuity between the + and - on relay pcb I see are short ...
I double checked everything,
diodes could be dead?
how can I test the relay?
Thanks

 

[wolfgang]

The strange thing is that by measuring the continuity between the + and - on relay pcb I see are short ...

do you measure continuity in both directions? if yes, the diode is dead!!

i would install a new one.

regards,
Wolfgang

 

[ilfungo]

Thanks wolfgang
Bypass now works
but it is another problem ....
Now a channel compresses while the other does not!
The strange thing is that it works in stereo



2 input signals
2 channels work with compression

if I use use a single channel
1 does not compress
2 compresses

What can it be? ??? ??? ???

 

[wolfgang]

2 input signals
2 channels work with compression

if I use use a single channel
1 does not compress
2 compresses

I dont understand you!

if you use a single channel only this one will compress! seems clear to me!

do you mean something different?

wolfgang

 

[ilfungo]

I'm sorry for my English ...
in stereo both channels compress
in a dual mono only one channel compress.... ???

 

[ilfungo]

Work!!!!!!

I found the problem ...
There was a short on the threshold pot!
Thanks wolfgang
Now I will try to calibrate

 

[ilfungo]

Guys I finished my DAOC
a question,
I used this unit:
http://www.musikding.de/product_info.php/info/p1361_Toroidal-transformer-230V----250V--9V--24V.html
After a while the compressor is on the trsformatore warms a bit,
Is this normal?
someone has the same problem?
how can I fix it?
Thanks

 

[[silent:arts]]

now we want to see some pics ;D

the Musikding transformer works fine in many D-AOCs.
"warms a bit" doesn't sound like it gets hot, which is fine.

 

[Patch]

Hey Volker! great project is it still possible to get PCBs for this project? i want one badly!!!!

 

[[silent:arts]]

Hi Patrick,

no problem:
http://www.groupdiy.com/index.php?topic=39570.0

 

[ilfungo]

now we want to see some pics ;D

the Musikding transformer works fine in many D-AOCs.
"warms a bit" doesn't sound like it gets hot, which is fine.

Ciao and sorry for delay!!!!
This is my D-AOC
red parallel led for soft compression
blu antiparallel led for hard compression
500R multiiturn trimmer on vactrol for matching
and true bypass!!!!
Thanks to silent:arts , Kubi ,wolfgang and and all those who contributed to this great project

 

[j.frad]

Back after new tests, I put a regular lm350 in and the heater came back to life, so that's good new, no need to try any fancy regulators.

EDIT: my voltages are correct.
It passes sound but there's no low end, has anyone experienced that? I'm using edcor iron with ratios as marked on the pcb...

EDIT: when exchanging transformaer to have 600:10k IN and 10k:10k OUT I get more bass but it's still not good. And the VU meter I use shows no gain reduction. The cd player I use to test is wired unbalanced.

EDIT as I go along: with the antiparallel LEDs it compresses ok, so i wasn't driving it hard enough like a lot of people when they first try it. So I guess it works fine but has no BASS...Zny idea before I try swapping transformers?

Almost there!
Cheers

 

[pablobolche]

Hello
I would like if someone could point me to a DAOC complete BOM.. don-t need the digikey!mouser numbers just the BOM.

Thanx

 

[mac]

How much variation on the supply voltage is there for the 9v heater circuit?

I am looking for a power trafo and found one that has Output Voltage (AC): 0-6.3V(1.2A) x2, 0-15V(1A), and 0-220V(100mA).

Just wondering if the AC heater feeds could be used to supply 12v (1.2A), as the LM350T datasheet states a max input - output differential of 35Vdc.
Will this make the reg work too hard? Is 1.2A too little current for the six tubes?

Mac


Oh.... and thinking that I should be able to make the 0 - 15v work instead of 24v on the relays, lamps etc.

 

[j.frad]

Hi there!
Turns out my loss of bass was due to the edcor output transformer... I'm running the outputs unbalanced now and it's working great. I don't know why it did that, I don't think I was loading it strangely... I'll probably leave it as it is.

I was wondering, since Kubi advised not to reduce C04, how could I introduce a highpass in that sidechain? I feel I could use it in case of extreme compression.
I feel it could be done around R110 or R114, but introducing a cap in between stages (R114) feels wrong in my uneducated mind.
Can anyone chime in on that point?

Thanks a lot to everyone, I'm really digging this unit, I'll post pictures when it's finished.

 

[ilfungo]

sorry
I finished my DAOC and it works fine
I used all the Kubi mod  except the double vactrol
I noticed a strange thing
when I try to compress a voice or acoustic guitar I hear a slight distortion ....
adding the second vactrol can improve this problem?
thanks

 

[j.frad]

Hi there again, I'm in the process of tweaking a few things in my DAOC before I close the lid.

I decided to use series resistors with the HT secondary to avoid overheating the regulator.
I first tried 500R (1k//1k 10W) and it still got hot, I measured 247VAC before rectification.

I tried a bit more, 900R, 1,4k, it gets better but I afraid the raw AC might get too low for the regulator to work properly.
It gives me respectively:
_220VDC after R1, 218 after regulation and the neons light up like a candle/not frankly
_201VDC after R1, 198 after regulation and the neons don't light up
both are lower than the voltages posted on this thread.

Do you think it could be a problem for the regulator to work at these voltages?
What would the drawbacks be soundwise in the resulting lower B+ on the tubes?
With the highest resistance I get:
114 instead of 133
99 -----------109
171----------222
62------------62
188-----------243
compared to here:

Any opinions? I'm flying blind here.
Thanks again everyone!

 

[ilfungo]

ciao Silvas

I also love the Kuby mod ....
I tried to insert a trimmer on stereo link
I can improve things but not completely fix ...
I do not know if it makes sense to try two trimmer .... ???

Two trimmers on the stereolink makes no sense to me.
Did you try to put the trimmers on the anodes of the vactrols? In not, why? Works perfect here.

I had ~2dB difference between the channels, easy fix with the trimmers. I might try to go back with dual vactrols since i can easy lower the compression with the trimmers.

This will screw up my nice matching when unlinked ???

Do you mean one trimmer on each anode ? 4 trimmers using kubi mod ?

My temporary solution if i want to use the channels linked is to use it as a M-S compressor, inserting a matrix before and after the DAOC . i've used like this a couple times where i wanted the channels linked and worked great. The small channel mismatch wasn't a problem working like this.

I able to adjust the  Vactro in stereo !!!! ;D ;D ;D
trimmer 500-hom (anode) vactrol L and R
100-hom ( cathode) at antiphase vactrol
I first adjust vactrol 1 and 2
then adjust vactrol 3 and 4

I think it can work even with a  single trimmer ( only on L or R)

All adjustments should be made with stereo link added
Thanks Eje2005 for your suggestions!!!!
Sorry for my english....