What does R2 do ?

[Vivek]

From the mixer part of manufacturer's application note of the MN3011


https://www.experimentalistsanonymous.com/diy/Datasheets/MN3011.pdf






Why is R2 33K needed?

What would happen if R2 was 0 ohms ?

[Vivek]

Is this a Mixer + Multifeedback filter in one ?

[iainpunk]

1)to set the HF gain and keep squealing and radio interference at bay
2)squeal/oscillation because there is a capacitor to ground to the (-) input in an inverting opamp
3) it seems to be a MFB filter, but i guess one of the cutoff points is outside the audible range, not sure tho.

cheers

[antonis]

Pardon me the rudeness but isn't preposterous to ask definitions for Panasonic/Mitsubishi manufactured device here..??

[PRR]

R2 is a resistor.

R1 R2 C1 C2 are a 2-pole filter.

[Rob Strand]

Is this a Mixer + Multifeedback filter in one ?

That's it.

[Vivek]

Thank you everybody !!