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Soundcraft Delta 8 - Overbridge Meter mod?
Old 26th December 2019
  #1
Soundcraft Delta 8 - Overbridge Meter mod?

Hey everyone...

I have a Soundcraft Delta 8.

I use the tape returns on the board for channels 1-16 from my DAW to the board; and the 16 led meters on the overbridge reflect these channels.

However, by design, if I use a return on my group channels, the overbridge will then meter the return rather than my inputs.

I'd like to have the overbridge continue to meter the 16 tape returns, even if I use the returns on the group channels.

(schematic attached)

Each group channel has two connectors (cn8, cn9), for metering from input channels and then one connector (cn10) which sends the two signals to the overbridge.

It appears to me that I may be able to wire the connectors from cn8/cn9 directly to cn10... and that way the overbridge would always reflect the 'regular' channels and not the returns on the groups; meaning:

cn8 pin1 -> cn10 pin1
cn9 pin1 -> cn10 pin3

Is there anything wrong with this?

What would I do with cn8/cn9 pin2?

Would I need to add any resistors or anything?

Also, would anyone have the delta 8 'technical manual' ? I have the schematics that float around but it appears the technical manual has in-depth descriptions of circuits etc, which may be useful.

Any insights are appreciated; thank you!
Attached Thumbnails
Soundcraft Delta 8 - Overbridge Meter mod?-delta8meterbridgemod.png  
Old 27th December 2019
  #2
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Radardoug's Avatar
 

Looking at that schematic, it indicates that the switching happens on the meter bridge. So you need to look there.
Old 27th December 2019
  #3
You can move the 2 pin molex meter wires over to the input modules. There is a place to solder in the 2 pin molex connector to feed the meters from the input modules.
Old 18th May 2020
  #4
Here for the gear
 

Hello Streber,

Did you manage to make the modification you wanted to display the level on the meterbride from the input channel (post fader?) ?

I am in the same situation as you.

Thanks

Quote:
Originally Posted by streber View Post
Hey everyone...

I have a Soundcraft Delta 8.

I use the tape returns on the board for channels 1-16 from my DAW to the board; and the 16 led meters on the overbridge reflect these channels.

However, by design, if I use a return on my group channels, the overbridge will then meter the return rather than my inputs.

I'd like to have the overbridge continue to meter the 16 tape returns, even if I use the returns on the group channels.

(schematic attached)

Each group channel has two connectors (cn8, cn9), for metering from input channels and then one connector (cn10) which sends the two signals to the overbridge.

It appears to me that I may be able to wire the connectors from cn8/cn9 directly to cn10... and that way the overbridge would always reflect the 'regular' channels and not the returns on the groups; meaning:

cn8 pin1 -> cn10 pin1
cn9 pin1 -> cn10 pin3

Is there anything wrong with this?

What would I do with cn8/cn9 pin2?

Would I need to add any resistors or anything?

Also, would anyone have the delta 8 'technical manual' ? I have the schematics that float around but it appears the technical manual has in-depth descriptions of circuits etc, which may be useful.

Any insights are appreciated; thank you!
Old 20th May 2020
  #5
Quote:
Originally Posted by systo View Post
Hello Streber,

Did you manage to make the modification you wanted to display the level on the meterbride from the input channel (post fader?) ?

I am in the same situation as you.

Thanks
Had an injury and then surgery shortly after I posted, so this got de-prioritized...

I also wanted to take a look in my board to make sure I understood given the responses seemed to conflict with what I understood.

Your post made me finally look and trace things;

The tape return jacks are each 'split' or 'double-wired' at the jack (for the normalled feature)
Each jack goes to both (2-Pin connectors):
CN5 (input jack) on Input Channels
CN9 (tape return) on Group Channels

On the group channels, cn10 (3-pin) connectors bring two-channels (and 1 ground) to the (db25?) connector for the meter-bridge.

I don't understand Radardoug's comment, because it seems clear to me that the 'switching' occurs at the return jacks which interrupt CN9 ...

After looking, I understand JW (of course, the authority) was referring to CN7, which on my modules already have 2-Pin Connectors.

So, now I understand that what I had proposed would skip a line input stage...

But unless I'm still not getting something, CN7 is 2-pin, and all the connectors to the db25(?) connector for the meter-bridge are 3-pin, to carry two channels each...

So, although I don't have to solder connectors onto my modules, I'd probably wire up a new db25 to 16 2-pin connectors (or a bunch of 2x 2pin to 1x3pin things) before cutting what I have...

Hope that helps.
Old 24th May 2020
  #6
Here for the gear
 

Hello,
If you exchange the CN5 and CN7 connectors, you can view the levels on the meterbridge because they are connected to CN8 and CN9 but the jacks must be connected to the tape returns.
The ideal, perhaps, would be to create a printed circuit with inverters allowing to choose what happens on CN8 and CN9 (Either the tape returns which also send on CN5, or CN7) ... This would allow to keep all the functionalities of the console.
Old 1st June 2020
  #7
Did it with dakota connectors, easy and appears to work great!

(mis-stated I needed a ground in the earlier post)

Also, systo said:
Quote:
Originally Posted by systo View Post
Hello,
If you exchange the CN5 and CN7 connectors, you can view the levels on the meterbridge because they are connected to CN8 and CN9 but the jacks must be connected to the tape returns.
The ideal, perhaps, would be to create a printed circuit with inverters allowing to choose what happens on CN8 and CN9 (Either the tape returns which also send on CN5, or CN7) ... This would allow to keep all the functionalities of the console.
...and I think this is incorrect information.

cn5 is essentially the input jack to the channel.
cn7 is essentially the output to the overbridge.

You cannot exchange these.

If you did, meters would still work when connected to the tape in, because that in is mult'd to the cn8/9 on the groups... but you wouldn't get audio.

The other point is, inserting a jack in the group would STILL interrupt the meter.

If you wanted all the functionality, you could make a switched '3 prong' piece to toggle between taking signal from cn10 on the group or cn7 on two input channels (as mine is now).
Attached Thumbnails
Soundcraft Delta 8 - Overbridge Meter mod?-soundcraftmetermod-sm.jpg  
Old 2 weeks ago
  #8
Here for the gear
 

Looks good. What is the part number for those connectors from dakota connectors?

Jim Williams advised me never to plug into the "tape returns" on the back of the board. Use the Line Input on the modules or the Return jacks right on the back of the groups to avoid sending your signal through all that cheap wire.


Old 2 weeks ago
  #9
Here for the gear
 

Quote:
Originally Posted by streber View Post
cn5 is essentially the input jack to the channel.
cn7 is essentially the output to the overbridge.

You cannot exchange these.
I believe Soundcraft says 'cn5' is there in case you want to wire all your inputs to an ELCO connector instead of fussing with separate cabling for each channel.
Old 2 weeks ago
  #10
Quote:
Originally Posted by redtordella View Post
Looks good. What is the part number for those connectors from dakota connectors?

Jim Williams advised me never to plug into the "tape returns" on the back of the board. Use the Line Input on the modules or the Return jacks right on the back of the groups to avoid sending your signal through all that cheap wire.


Ok, not sure why I wrote 'dakota'... it's apparently 'dupont'... shows how much I really know!

I bought a kit that came with 1550 pcs of Dupont connectors, pins, etc, and a crimper.

Attempting to include the amazon link

Though it would have been nice if I had the type that 'locked' into place as the connectors on my modules are capable... but I don't know the name for those.

JWs advice makes sense... once you have the meterbridge hooked up directly
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