Going to API mixer(Something to use with 2-ACA-Bo)

GroupDIY Audio Forum

Help Support GroupDIY Audio Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

ForthMonkey

Well-known member
Joined
Sep 4, 2013
Messages
1,115
Location
Turkey
I'm thinking to buy 2-ACA-Bo PCB and build 8 channel summing amp/line mixer.For channel i changed Forssell 8ch sum design and made something like this.

Channel boards!

jj3RVn.jpg


------------------------------------------

My references to build this;

Forssell 8 ch sum

http://www.forsselltech.com/media/attachments/8chsum_1.pdf

------------------------------------------

Channel Design

API balanced transformerless amplifier

http://www.davegroupjapan.com/api2520_02.gif

And my design.I added simple mechanical mute,too.And removed DIP8 op amp option.

N4vnkO.png


------------------------------------------

Board Design

I want to buid it to use with 15 pin edge connector and also without edge connector.I added some via to use without connector.

ql6WdQ.png


------------------------------------------

Bus Selector Design

Self etch files for bus routing section.Simple stereo buses.8 stereo bus and a master bus.

Schematic

https://dl.dropboxusercontent.com/u/91809016/SUM/Bus%20Select/Schematic.pdf

Bottom

https://dl.dropboxusercontent.com/u/91809016/SUM/Bus%20Select/Bottom.pdf

Layout

https://dl.dropboxusercontent.com/u/91809016/SUM/Bus%20Select/Top.pdf

3d.png


------------------------------------------

Back Board Design

Not necessary but it's good to make it compact and clean.Made for minimum 4 channels.Using with rails is good idea.Cause channel pcb is not too long.So back pcb can't fit to pack panel.I added simple molex connectors to connect in,out and power.I don't want to fight with inside cables.Only in,out and power.

poZbE0.png


Self-etch files

Bottom

https://dl.dropboxusercontent.com/u/91809016/SUM/Back_Bottom.pdf

Layout

https://dl.dropboxusercontent.com/u/91809016/SUM/Back_Top.pdf

------------------------------------------

MOD1 Discrete op amp

I just made in with Eagle.It's already exist but there was no gerber.

http://sureshotstudio.blogspot.com.tr/2011/09/urei-mod-1-opamp.html

B0YWML.png


Gerber Files

https://dl.dropboxusercontent.com/u/91809016/MOD1/MOD1.rar

Self-etch file for 40 pieces.

https://dl.dropboxusercontent.com/u/91809016/MOD1/Self-Etch.pdf

Thanks.
 
Oh,thanks iprovlek.

BTW i added new circuit with simple mute section.It's just and option.And here is 3D board...
 
another cool small project from you. have you considered adding decoupling caps for opamp psu rails? i tried to hint this moons ago on your other project ;)

see this, must be the thread of the subject http://groupdiy.com/index.php?topic=37307.0
 
tmuikku said:
another cool small project from you. have you considered adding decoupling caps for opamp psu rails? i tried to hint this moons ago on your other project ;)

see this, must be the thread of the subject http://groupdiy.com/index.php?topic=37307.0

Thanks for reply and advice.I was thinking about to add decoupling caps,too.I will read all thread.  ;D Thanks again!
 
I dont think that the 2520 would be very happy with its output conected to ground via the mute switch.....??
I belive the top of the fader should be conected to ground.
 
wow, this is really cool. I'm in somewhat of the planning stages of my own summing mixer, but want to add EQ and compression for each channel. I really like a lot of your projects and designs, very small and modular.

have you built any MOD1's? Have more details? BOM etc?
 
Humner said:
wow, this is really cool. I'm in somewhat of the planning stages of my own summing mixer, but want to add EQ and compression for each channel. I really like a lot of your projects and designs, very small and modular.

have you built any MOD1's? Have more details? BOM etc?

With 500 series this project could be good,i guess.Or you can build 500 series modular console with CAPI products.

MOD1 info.I made simple booster with this op amp.Working good.

http://sureshotstudio.blogspot.com.tr/2011/09/urei-mod-1-opamp.html
 

Latest posts

Back
Top