--- In Klas Strandberg
<> wrote:
> Evert wrote:
>
> > [own remark: In both cases this is done by letting the same
signal
> > go thru the same opamp, but with 1 resistor more or less in the
> > circuit. So overdriving the opamp will happen at the same SPL no
> > matter the switch position.]
>
> Hm...? The "1 resistor more or less" is the resistor setting the
gain of the
> op amp. The lower value (Ohms)- the higher op-amp gain, the lower
headroom
> and the more distortion you get when input goes high. Observe that
such "too
> much" never shows on the meter!
>
> Klas.
Hi Klas
The configuration is a non-inverting opamp configuration. The lo/hi
switch only switches between 5 or 50 times amplification, no other
circuitry is used, I checked the service manual to make sure.
When is the selfnoise of an opamp the lowest, at high gain or at low
gain (closest to unity gain)
Regards, Evert
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