[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #1440 on: February 12, 2019, 03:16:02 PM »
Do i need to replace R126 & R226 with a trimmer in order to make the meters read zero dB?
At the moment they stay on the complete left side.
No. Meter switch wired correctly?


weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1441 on: February 12, 2019, 03:24:47 PM »
No. Meter switch wired correctly?

yes, + of GR on the pcb is connected to + on meter side.
btw. No audio passing when not in bypass mode  :'( :'( :'(


I think i got to check the lundahl wiring again as i wasn't sure about the connections in the first place..

I did it like this:

Primary: pins 2+4 tied, pin 1(+), pin 3(-) - From Bypass board XLR
Secondary: pins 5+7 tied, pin 8(+), pin 6+pin E(-) - To PCB

For the output I wanted to wire reversed 2:1

Primary: pins 8+5 tied as (+), pin E to ground - From PCB
Secondary: pins 2+4 tied, pin 1(+), pin 3(-) - To Bypass PCB

Potato Cakes

Re: D-AOC PCBs - the building and help Thread
« Reply #1442 on: February 12, 2019, 10:07:48 PM »
yes, + of GR on the pcb is connected to + on meter side.
btw. No audio passing when not in bypass mode  :'( :'( :'(


I think i got to check the lundahl wiring again as i wasn't sure about the connections in the first place..

I did it like this:

Primary: pins 2+4 tied, pin 1(+), pin 3(-) - From Bypass board XLR
Secondary: pins 5+7 tied, pin 8(+), pin 6+pin E(-) - To PCB

For the output I wanted to wire reversed 2:1

Primary: pins 8+5 tied as (+), pin E to ground - From PCB
Secondary: pins 2+4 tied, pin 1(+), pin 3(-) - To Bypass PCB

Are you using Volker's HWBP boards to do your bypass function? If so, there shouldn't be any signal going to the transformers when in bypass. It should just go from input to output XLR directly. The small boards by the connectors make it hard to see what is going on there.

Thanks!

Paul

[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #1443 on: February 13, 2019, 12:13:29 AM »
Your Lundahls are wired wrong. The input may work but the output won't.

For 2:1
Primary: pins 2+4 tied, pin 1(+), pin 3(-)  (PCB)
Secondary: pins 5+8 tied(+), pin 8(+), pin 6+7 tied(-) (Bypass PCB)

Pin E is shield & case and should go to gnd (I would use the shield of the cable from / to the Bypass PCB).

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1444 on: February 13, 2019, 01:58:28 AM »
Are you using Volker's HWBP boards to do your bypass function? If so, there shouldn't be any signal going to the transformers when in bypass. It should just go from input to output XLR directly. The small boards by the connectors make it hard to see what is going on there.

Thanks!

Paul

Hi Paul, thank you.
These are Volkers boards, they work fine. I get signal when in bypass so that’s okay.

Your Lundahls are wired wrong. The input may work but the output won't.

For 2:1
Primary: pins 2+4 tied, pin 1(+), pin 3(-)  (PCB)
Secondary: pins 5+8 tied(+), pin 8(+), pin 6+7 tied(-) (Bypass PCB)

Pin E is shield & case and should go to gnd (I would use the shield of the cable from / to the Bypass PCB).

Ahh.. thank you Volker !!
I‘m gonna rewire and check again.

Potato Cakes

Re: D-AOC PCBs - the building and help Thread
« Reply #1445 on: February 13, 2019, 02:25:01 AM »
My reading skills are failing. I see now that you said no audio when not in bypass. Hence HWBP working, whilst signal through the unit is not. My apologies.

On a side note, I an interested to see yours up and running. I have a completed DAOC board that I have been staring at for a couple of years with the intent of making a mastering compressor, which I have wanted but never really liked any of the expensive ones I've rented. Please continue to keep up updated.

Thanks!

Paul

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1446 on: February 13, 2019, 02:37:05 AM »
My reading skills are failing. I see now that you said no audio when not in bypass. Hence HWBP working, whilst signal through the unit is not. My apologies.

On a side note, I an interested to see yours up and running. I have a completed DAOC board that I have been staring at for a couple of years with the intent of making a mastering compressor, which I have wanted but never really liked any of the expensive ones I've rented. Please continue to keep up updated.

Thanks!

Paul
No worries!
I will keep you updated. My only intention is to let this thing end up in my rack  ;D

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1447 on: April 18, 2019, 07:30:59 PM »
I started a second DAOC and this one worked from the first time!
Awesome project, really happy about the sound, worth the effort !!

Thank you everyone for the support.

Now it’s time to finish my earlier build.... :P



weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1448 on: April 19, 2019, 11:27:26 AM »
Your Lundahls are wired wrong. The input may work but the output won't.

For 2:1
Primary: pins 2+4 tied, pin 1(+), pin 3(-)  (PCB)
Secondary: pins 5+8 tied(+), pin 8(+), pin 6+7 tied(-) (Bypass PCB)

Pin E is shield & case and should go to gnd (I would use the shield of the cable from / to the Bypass PCB).

i wired it like this but i still don't get any signal through..  :(

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1449 on: April 21, 2019, 11:38:16 AM »
Is this the correct wiring?



[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #1450 on: April 21, 2019, 01:43:46 PM »
Looks fine to me.

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1451 on: April 21, 2019, 04:46:18 PM »
Looks fine to me.
hmm.. i completely rewired the audio transformers after this schematic but still can't get any signal..

[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #1452 on: April 22, 2019, 03:43:28 AM »
- You managed to build another working D-AOC?
- It affects both channels?
- Chances are low all 4 transformers are bad?

Check the transformers by connecting the two (in your drawing) "MAIN PCB" cables.
Check the Main PCB without transformers by connecting the "BYPASS PCB" to the MAIN PCB" Points .

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1453 on: April 22, 2019, 03:57:35 AM »
- You managed to build another working D-AOC?
- It affects both channels?
- Chances are low all 4 transformers are bad?

Check the transformers by connecting the two (in your drawing) "MAIN PCB" cables.
Check the Main PCB without transformers by connecting the "BYPASS PCB" to the MAIN PCB" Points .
- Yes i got one completely working with edcors
- both channels are silent
- yes very unlikely as i bought them from different sellers

i will check the wiring again before and after the lundahls and report back!

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1454 on: April 22, 2019, 10:51:25 AM »
Check the transformers by connecting the two (in your drawing) "MAIN PCB" cables.
Check the Main PCB without transformers by connecting the "BYPASS PCB" to the MAIN PCB" Points .

Thank you volker!

I now hooked up the transformers and bypass boards from my second unit with my non-working unit to check where the problem lies: Everything was working using the transformers from the other unit. I got signal on both channels and compression & all the controls were working fine!

So either the wiring of the lundahls is wrong or my bypass board has errors.. ???
Could you confirm for me, hot is + and cold - going and coming from the transformers?

I already checked if the signal from the xlrs goes into the board and i found continuity to the relais.
What else could i check?

Maybe some of the people who used the LL1540 transformers had similar experiences ??

Thanks!

[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #1455 on: April 22, 2019, 11:27:47 AM »
Could you confirm for me, hot is + and cold - going and coming from the transformers?
Sure. But even if you swap hot and cold there will be signal.
It must be something stupid and easily overlooked, something like a swapped in and output maybe?

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1456 on: April 22, 2019, 03:49:51 PM »
Sure. But even if you swap hot and cold there will be signal.
It must be something stupid and easily overlooked, something like a swapped in and output maybe?

yes something like that! but i can't see anything obvious...
is there a way to check?!

i mean there is some kind of sound getting through on one channel but this is so extremely low that i have to turn up the signal for 40 db or something and it's extremely distorted...  ???

I'll post a picture, i am certainly overlooking something

[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #1457 on: April 22, 2019, 04:00:10 PM »
Compare every single cable with your working Edcor Unit.

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1458 on: April 22, 2019, 04:19:39 PM »
Compare every single cable with your working Edcor Unit.

ok i will! are the numbers equal? thanks for the tip.

here the pictures

weiss

Re: D-AOC PCBs - the building and help Thread
« Reply #1459 on: April 22, 2019, 04:20:38 PM »
not sure if this will help.


 

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