D-AOC PCBs - the building and help Thread

[bernbrue]

ask our member TonydB.
regards
Bernd

 

[ChrioN]

Just to clarify things; The unit does not compress until you put in a LED in parallel with the vactrol...?

 

[[silent:arts]]

No.
But without any mod you need a huge input level for compression.
which isn't good for THD, btw.

 

[Rob Flinn]

Having a bit of a problem with my unit here. Can someone post some anode, grid, & cathode voltages for the 12at7/ecc81 ? Preferably from a perfectly working unit ;-)


Also what should the HT voltage be ?

 

[pH]

Rob,
I've got 243vdc HT, on the 12AT7 I see 96v on the plate and 1.3v on the cathode. My voltages are a bit lower than Volker's but all within reason:

http://www.groupdiy.com/index.php?topic=26585&start=290

I've had a bit of trouble with heat shutting down the voltage regulators unless I'm driving with the top down. I tried to go with the sinks on board but I guess I'll have to join the exodus overboard.

I know everyone is already drooling over the next project (Poorchild) but I have to say this compressor is killing me on drums. A very fine design.
Hats off to our friends Analag and Volker :guinness: :sam: :guinness: :sam:

 

[MartyMart]

PH - Isn't it just the 350 reg that has to go "off board" ?
Mine is ready to bolt onto the back plate of the case.

MM

 

[[silent:arts]]

just the heater regulator, right.
don't forget to mount it isolated and double check with a meter before firing up :wink:

 

[pH]

Yep, the 350 is the one that seems to be the culprint. When it starts to shut down your heater voltage sinks, and the the HT will rise until it takes the fuse down. Seems like that LM783 is getting just as hot, to touch at least. I'm going to bolt them both (isolated, of course) to the chassis.

 

[Jonkan]

I have a question. My power transformer has a secondary for the psu3 that is 24Volts. I ordered 12v relays, and a lm7812 regulator. Is that too much voltage for the 7812 to drop? I have the silkscreened heatsink attached to it, the 51mm high version.

Or will i have to order new relays?
/J

 

[[silent:arts]]

I would order the 24V relays.
24V to 12V is a bit much in my opinion.

you will need the 12V relays for the Poor Man Bypass :green:

 

[MartyMart]

Jonkan, look back several pages as I have a similar problem, 12v relay's
but a 24v reg ( your 12 will indeed have to drop too much and will overheat)
Volker drew up a wiring picture for using the 12v relay's in series with a
few trace cuts and 2 x wires added.
Perhaps it will work the same for yours too running off a 24v reg.

Marty.

 

[[silent:arts]]

[quote author="MartyMart"]Volker drew up a wiring picture for using the 12v relay's in series with a few trace cuts and 2 x wires added.[/quote]
ah, yes :grin:
http://www.groupdiy.com/index.php?topic=26585&start=194

 

[Jonkan]

Perhaps ill just skip the bypass altogether on this one and do it on my poor mans instead.

I have never really used bypass anyway on anything ive built so far.

I still have a shipment waiting from musikding though. Would these 24v relays fit on the bypass pcb? I guess i could always ask him to ship it with my other stuff if i decide to order them.

http://www.musikding.de/product_info.php/info/p1612_Finder-3022-12-2PDT-24V.html

this relay is what i have:
http://www.musikding.de/product_info.php/info/p1076_Omron-G5V-2-2xUM-12V.html

possible to mod with volkers solution?

Thanks!!!
/J

 

[crisotop]

Klaus (Musikding) said it's also possible to get the omron's in 24V - just write him an email - he has various parts in stock that aren't online yet (eg. LM337 etc.)

hth, christoph

 

[Jonkan]

Ok, will do!
/J

 

[Benny]

After putting my D-AOC stuff in the new case and testing it I've got a problem with the right channel.
Both channels input and output pots work, both channels are compressing
but the second channel has no bass. Just high frequencies and it sounds like it is distorting when it's compressing heavily. I just checked if I've got some wrong parts in channel 2. But compared to channel 1 everything seems to be the same. I'm using Edcor WSM on input and XSM on output.
I'm gonna look over it again tomorrow morning. Any ideas?

 

[bernbrue]

Benny,
did you use the relais boards as well? Which XLR connectors did you use?Check the polarity for relais power. Check also the transformer wiring (pin 1 is +, pin 4 is -) Can´t imagine that you´ve got wrong parts in there.
regards
Bernd

 

[synthi]

Quick question:

I don´t have the 1n5371 at hand, but I have either 1N5372 or 1N5370.

the 5371 is a 60V zenner, 5370 is 56V and 5372 is 62V, So I think I can use one of them in place?

Anyone???

 

[MartyMart]

I think that your 62 volt version will be fine and dandy.
It's not an exact value, just needs to be "around" 60 v.
MM

 

[synthi]

thx MM!