[sdiy] Non-inverting summing amplifier

[Scott Nordlund]

You don't see a non-inverting summing amplifier because it doesn't really exist.  An inverting mixer works because it adds currents- the inverting terminal is held at a virtual ground (ideally) so the currents through the input resistors are summed together.  A non-inverting amplifier doesn't have a summing node- instead the non-inverting input is a high-impedance voltage input, and you can't really add voltages by just combining them (you can just use a simple resistive mixer, but this isn't necessarily a good solution).

> Date: Wed, 28 Jan 2009 04:41:54 +0000
> From: elektrodwarf at yahoo.se
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Non-inverting summing amplifier
> 
> Hi list
> 
> Is there a reason that i never see non-inverting summing amplifier, i.e. simply a non-inverting amp with several resistor inputs?
> 
> Karl
> 
> 
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