summing LAWO dv 975/3 build

[cuerdasvivas]

Hello My name is Martin am from Argentina, I recently acquired a LAWO DV 975/3, here there is no person so can install it, would build the summing simply:

16 ( 8 + 8 ) via db25
1 L + R out
Gain key (selectable  0 db to 6 dB)
key on / off with LED indicator
external power
if possible, from mono to stereo keys

I have understood that has a filter to make this, I be quite aware of the technical qustions in  the card

I don't Know electronic but I can  use a soldering iron very well, I wonder if there is a step by step or someone available to help create to do it (obviously as a paying job)

Thanks in advance

 

[cuerdasvivas]

anybody Here? I  need some schematic to build myself, I find nothing like that for here, just  dispersed information , maybe someone can create it for me? (job)

 

[chefducuisine]

In general all the infos you need are on this forum  (search for 'summing').
Then get the data sheet for the Lawo DV975...

You basically need four things:
1. resistors to decouple the inputs
2. a makeup stage
3. a power supply
4. a housing / case

As you are using the Lawo card you already have the makeup stage. This card needs a 24 Volt power supply. The easiest way is to go via a wall wart with 24V and at least 200mA (500mA recommended). This also saves you from having to deal with lethal voltages. Connect +V to Pin 31 an GND to pin 1. (You'll probably need to re-cap the card first - highly recommended).

For the decoupling  you'll need 4,75 kOhms resistors. Make sure to match them in pairs!!!
On how to mount them I simply quote Iain (ruffrecords on this forum):

Check out my DB25 configuration document for details of how to determine bus slugging resistors:

https://drive.google.com/file/d/0B_n67A1hN3qtZGtMdjNybnF6XzQ/view?usp=sharing

Cheers

ian

Have Fun!