ilfungo

Re: D-AOC PCBs - the building and help Thread
« Reply #780 on: May 04, 2010, 05:30:26 AM »
II saw that many have mounted with the heatsink off the card ....
is to prevent overheating?
Thanks


[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #781 on: May 04, 2010, 06:05:32 AM »
II saw that many have mounted with the heatsink off the card ....
is to prevent overheating?
Thanks
yes. mount it (important: insulated !!!) to the case is much better than the heatsink on the PCB.

ilfungo

Re: D-AOC PCBs - the building and help Thread
« Reply #782 on: May 04, 2010, 06:56:00 AM »
Thanks silent:arts
What do you mean by " insulated"?
Thanks

[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #783 on: May 04, 2010, 07:03:23 AM »
no electrical contact between the TO220 and the case.
http://www.aosmd.com/pdfs/appNotes/AN101_TO220_Guidelines.pdf

Benny

Re: D-AOC PCBs - the building and help Thread
« Reply #784 on: May 05, 2010, 03:31:41 PM »
Hey guys,

did some improvements on my D-AOC yesterday. Kubi mod etc.  The unit sounded great but I did not calibrate the meters yet. So I installed a 100k trimmer for R126 and R226 and followed the instuction posted earlier in this thread. Channel 2 is now working great. Meter tracking is a little off, but no problem for me.
But I couldn't get the first channel working right. Everytime I turn up the threshold pot the VU goes up, too. So I checked everything and found out that suddenly the NE2 lamp in ch 1 did not work. I thought that it could have something to do with the meter tracking, took out the board, soldered in a new NE2 and after powering up channel 1 did not compress any more. In and out amps are o.k. and sound great but no compression.
Checking the unit again I found out that the stereo-link wire from channel 1 got torn off the switch while soldering and maybe got contact to the power switch, which is right below the link switch in the purusha case... ;D I soldered the wire to the switch and tested again, but still no compression...

Any ideas??? Checking the pcb for a day and a half, my brain's empty now.

Benjamin

wolfgang

Re: D-AOC PCBs - the building and help Thread
« Reply #785 on: May 05, 2010, 04:56:18 PM »
Quote
I found out that the stereo-link wire from channel 1 got torn off the switch while soldering and maybe got contact to the power switch, which is right below the link switch

Maybe the vactrol got damaged? I dont know how to test it properly but you could compare it with the working channel?

regards,
Wolfgang

Benny

Re: D-AOC PCBs - the building and help Thread
« Reply #786 on: May 06, 2010, 01:13:13 AM »
I just put two new vactrols in my D-AOC, calibrated the meters again and voila...
My D-AOC works perfectly now and most of all sounds great!!!  ;D
I just tested it a bit on vocals and love it.
Meters tracking is good, btw.

Benjamin
« Last Edit: May 07, 2010, 09:34:48 AM by Benny »

Soeren_DK

Re: D-AOC PCBs - the building and help Thread
« Reply #787 on: May 11, 2010, 06:41:35 PM »
Anybody done some drawings of the off-board-wiring?

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub

jensenmann

Re: D-AOC PCBs - the building and help Thread
« Reply #788 on: May 16, 2010, 05:01:44 PM »
After a DIY break of more than a year I finally made it to put the longtime finished PCB in a case. Here´s some pictures from my DAOC on the bench while meter calibration. I replaced R126/226 with a 100k trimmer to get a better GR tracking. Some of Kubis mods are installed. Sidechain filter frequency is 200-something Hz. Input iron is Stancor/MCI 4:1 reversed, output is Edcor WSM. Tubes are Siemens/Telefunken, meters are NOS Philips. Unfortunately I could not yet listen to it. There´s some 2W resistors which I have to replace because they get very hot and are placed too close to caps. They will damage the caps if running for a longer time. Wiring is a mess, of course.







Thanks to Analag, Volker, Kubi and Frank "NRGrecording" for making this happen.
Jens
Quote from: PRR
The tubes of course don't care what frequency they distort

[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #789 on: May 19, 2010, 09:23:15 AM »
Jens, you know we need more and larger pics  ;D ;D ;D



Soeren_DK

Re: D-AOC PCBs - the building and help Thread
« Reply #791 on: May 19, 2010, 11:06:44 AM »
Anybody done some drawings of the off-board-wiring?

Cheers
Soren
?

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub

Eje2005

Re: D-AOC PCBs - the building and help Thread
« Reply #792 on: May 19, 2010, 11:47:09 AM »
Anybody done some drawings of the off-board-wiring?

Cheers
Soren

There´s not much to draw up.
What are you wondering about?

[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #793 on: May 24, 2010, 08:57:59 AM »
for jensenmann:



 ;D ;D ;D

Soeren_DK

Re: D-AOC PCBs - the building and help Thread
« Reply #794 on: May 27, 2010, 04:29:15 PM »
Anybody done some drawings of the off-board-wiring?

Cheers
Soren

There´s not much to draw up.
What are you wondering about?
I can't figure out how the stereo switch is working?

@Volker
Do you have the layout for the Haufe trafo pcb you have in your unit? I have some 255/1 I want to use..

Cheers
Soren
« Last Edit: May 28, 2010, 06:14:43 PM by Soeren_DK »
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub

Benny

Re: D-AOC PCBs - the building and help Thread
« Reply #795 on: May 28, 2010, 07:50:18 AM »
I can't figure out how the stereo switch is working?

Just connect the + pin of each channels stereo link pad.

Soeren_DK

Re: D-AOC PCBs - the building and help Thread
« Reply #796 on: May 28, 2010, 06:24:31 PM »
Of course... hehe.. stupid question.
How does it work? What does the stereo signal do to both units? How do you control the stereo unit?

Can I use any Lundahl for this project?
I have some LL1540 and some LL5402 laying around..

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub

seavote

Re: D-AOC PCBs - the building and help Thread
« Reply #797 on: May 28, 2010, 06:59:57 PM »
not certain so if im wrong someone correct me.
i believe the sidechain signals are combined and then sent to the vactrol. this way both sides recieve the same signal and compress equally.
the two pin molex confused me.       (-) remains unused
Everyday is a gift. Thats why it's called the present

[silent:arts]

Re: D-AOC PCBs - the building and help Thread
« Reply #798 on: May 29, 2010, 04:36:08 AM »
not certain so if im wrong someone correct me.
i believe the sidechain signals are combined and then sent to the vactrol. this way both sides recieve the same signal and compress equally.
absolutely correct

the two pin molex confused me.       (-) remains unused
there are no one pin molex available ;D
and I like to use shielded cables, and connected (-) to ground.

How do you control the stereo unit?
the controls of both sides influence the gain reduction in stereo mode.

Soeren_DK

Re: D-AOC PCBs - the building and help Thread
« Reply #799 on: May 29, 2010, 04:43:25 AM »
Thanks :D :D

@Volker
Do you have the layout for the Haufe trafo pcb you have in your unit? I have some 255/1 I want to use..

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub


 

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