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Old 28th September 2008, 03:00 PM   #1
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Join Date: Sep 2008
Wink Summing Amp Schematic - API 2520 opamp

Hi y'all...

Just discovered this site - great!!

My first post. I wish to build a summing amp (box) from API 2520 op amps. Basically, I want to feed two line signals (ie; from my outboard pre-amps) into a box, with one line output coming from the box (to plug into P-Tools) - no gain control, phase switching, or padding required as this is all done at the pre-amp stage...

My mission - to stop recording a track in Protools for every; being able to summ together to microphones post pre-amp into one input pre-Protools.

I'm wondering (hoping) if anyone out there has a schematic for such a unit that I could either modify or start with.

Many thanks.
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Old 29th September 2008, 02:00 AM   #2
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shown below is a summing amp. you can see by the dotted lines that any number of inputs can be added. the summing amp is unity gain,

edit.... it would help if i included the picture......
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