[sdiy] adding multiple signal/cv inputs: SSM2044

[harrybissell at wowway.com]

The 4.7K and the 220 ohm make a 'passive' summer. Its not really a sum because
the inputs will  interact a little bit... a couple of percent.  I'm assuming
that you want that divider to set the maximum input level to the chip.  More
4.7K would be ok.

You could scale down the 220 ohm, it would be a better mixer but the signal
levels would drop. Or scale up the 4.7K...

Think of it as an EFM style mixer... crude but maybe effective if it works
well enough for you.  I think you would not need real precision for audio
input levels

H^) harry





On Wed, 15 Oct 2008 18:18:01 +0000, Dan Snazelle wrote
> i might just have to add a summer...would it help if i removed that 
> 4.7k and replaced it? does the ssm2044 have a summer inside of it?
> 
> going to check out my datasheet
> 
> thanks
> 
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Harry Bissell & Nora Abdullah 4eva