Another way to paradise ?

[Bernhard]

Today in the train while trying to understand the susy for the first time, I got some idea...

Just quick and dirty:



At the negative inputs of the op amps the clean part of the signal is much more attenuated than the distortion part.

Any good ?

Output impedance of the signal source is 0 ohm.

[Nelson Pass]

The distortion will pass through V3 to the positive input,
and be reamplified, won't it?

[Bernhard]

Originally posted by Nelson Pass
The distortion will pass through V3 to the positive input,
and be reamplified, won't it?

Yes but when I look at the mono susy amp, I can see a similar positive feedback path from amp's left output - feedback to other side resistor - right side noninverting opamp input- input series resistor- signal source - input series resistor- left side noninverting opamp input

[Bernhard]

I connected R22 to the noninverting input of x1 and other side same thing.

Then played with values to get full output swing @ 2V input.

Added a 5kHz sine source with 10Vpp and a 10ohm series resistor and connected that parallel to the load.

This is my distortion

With PSU switched off in the sim this gives a 5kHz 4.5Vpp sine across the load.

With PSU switched on and inputs shorted the 5kHz sine is reduced to 50mV.

-40dB ?

The 5kHz sine across the 1k input resistors is 160yV.


What does this want to tell me


It is also very nice to see in the sim how the opamp output (if a 10ohm is added on the opamp output) works against the external distortion