That Corp VCA compressor Dn125

Hello

I have been studying the THAT Corp Dn125 application note. No where is the function of VR2 explained. From my understanding this functions as a ratio control?

http://www.thatcorp.com/datashts/dn125.pdf

sorry  I see about 10 or 11 schematics in that ap note with R2s... which one?

JR

JohnRoberts said:

sorry  I see about 10 or 11 schematics in that ap note with R2s... which one?

JR

Click to expand...

Figure 1 and figure 7

Page 3, discussing Fig 1:

PRR said:

Page 3, discussing Fig 1:

Click to expand...

In that context VR2 is "slope".

Threshold determines when or above what input level it starts compressing/limiting (reducing gain). The threshold pot adds in a DC to bias that circuit off at lower level.

Gain trim is a overall gain offset independent of compression, aka "make up gain". This trim adds in a control voltage to statically vary the gain.

The subject pot varies how severely it reduces the gain when signal rises above threshold, or slope.

JR

Goes by the name of "ratio" in comparable schematics by THAT.

L´Andratté said:

Goes by the name of "ratio" in comparable schematics by THAT.

Click to expand...

Slope and ratio are both names for the same parameter.