andow

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #520 on: March 04, 2020, 12:51:36 AM »
Wow, just discovered this and am really interested! Anybody tried it in a Trident 80?

How many channels can be summed with this board? I guess there shouldn't be a limit, but I'm wondering why there is a cascaded summing in the block diagram?  ???


Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #521 on: April 16, 2020, 08:57:52 AM »
Hy

Can be used balanced inputs with this board?
Out of daw via RME fireface, to resistors board to capi 2-aca-bo stereo out balanced via RME in DAW.

thanks in advance

jsteiger

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #522 on: April 16, 2020, 12:14:00 PM »
Hy

Can be used balanced inputs with this board?
Out of daw via RME fireface, to resistors board to capi 2-aca-bo stereo out balanced via RME in DAW.

thanks in advance
Yes it can be done. I kinda depends on the interface. The cold leg will likely need to be grounded. Some electronic devices don't like this, some don't care.
Visit the CAPI store at http://www.capi-gear.com

CAPI is not affiliated with, endorsed by, or sponsored by API.

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #523 on: April 16, 2020, 04:31:08 PM »
Ok thanks

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #524 on: April 18, 2020, 05:32:12 AM »
Hy
i have heard that signal from resistor board is too weak. After resistor board signal becomes a microphone signal and it is too weak for input in aca board. Is that correct?
If so I can put an input transformer in between to increase signal to correct input level for aca?
Is that correct.
For Chanel's inputs I will use passive summing resistor board van Ian.
This is idee rme out to passive summing resistor board out to 2 aca board

Thanks in advance

jsteiger

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #525 on: April 18, 2020, 12:59:43 PM »
Hy
i have heard that signal from resistor board is too weak. After resistor board signal becomes a microphone signal and it is too weak for input in aca board. Is that correct?
If so I can put an input transformer in between to increase signal to correct input level for aca?
Is that correct.
For Chanel's inputs I will use passive summing resistor board van Ian.
This is idee rme out to passive summing resistor board out to 2 aca board

Thanks in advance
I am not really sure what "resistor board" you are talking about. In a  typical application, 47k bus resistors are used and they are fine with the rest of the 2-ACA-Bo built as we suggest.
Visit the CAPI store at http://www.capi-gear.com

CAPI is not affiliated with, endorsed by, or sponsored by API.

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #526 on: April 18, 2020, 02:10:20 PM »

Potato Cakes

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #527 on: April 18, 2020, 10:44:10 PM »
Hy
i have heard that signal from resistor board is too weak. After resistor board signal becomes a microphone signal and it is too weak for input in aca board. Is that correct?
If so I can put an input transformer in between to increase signal to correct input level for aca?
Is that correct.
For Chanel's inputs I will use passive summing resistor board van Ian.
This is idee rme out to passive summing resistor board out to 2 aca board

Thanks in advance

The first stage DOAs on the board do the make up gain for the signal loss after the summing network. The second set is for a fader insert.   The console I installed mine in uses 10k for bus resistors and there is no issue with gain. I've also built a unit using the recommended 47k resistors also with no issue. The only way I can see you having problems is if you are not feeding line level to the summing network.

There are several passive style summing contraptions such as DB25 to two (2) XLRs and the end user is usually instructed to plug it into a preferred preamp for the tone of their liking, but that probably has more to do with the fact that most consumers of pro audio gear won't have, want, or know how to build a dedicated gain circuit for summing.

In conclusion, build one and just follow the instructions. They're awesome.

Thanks!

Paul

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #528 on: April 19, 2020, 05:23:54 AM »
Thank you  for info

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #529 on: May 27, 2020, 06:20:38 AM »
Hi all,

I just realized my console PSU is unipolar and would need the -24 rail to power AM10 on the ACA board.
How would you guys do it? Should I use a separate PSU?

Thanks !

Fabien


Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #530 on: June 23, 2020, 02:15:19 PM »
Hello Jeff,

I've noticed that in your ACA schematic you list 47k feedback R, while in the ACA/BO, on the ACA side you list 28k.
I've built a summing mixer with 2520 receiver stages, 47k bus R's and following the ACA/BO schematic, 28K bus resistors in the ACA/BO (47k in booster with a 10k switch). What gain should I expect at the output of the 2503?

How would the gain change with 47k in the ACA?


Thanks and all the best,


jsteiger

Re: [BUILD]CAPI 2-ACA-Bo~Official Support Thread
« Reply #531 on: June 23, 2020, 02:23:05 PM »
If built to the schematic it will be unity gain.
Visit the CAPI store at http://www.capi-gear.com

CAPI is not affiliated with, endorsed by, or sponsored by API.


 

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