Hello. I have a question about the wiring of the THAT2180 VCA. This IC is wired internally in such a way that the incoming control voltage can be wired with a linear potentiometer, and then you still get a logarithmic behavior at the output. This wiring makes sense if you want to use the THAT, for example, to control the volume (eg in the channel strip of a mixer). Then the 2180 even had a few dB positive reserve above zero.
I would now like to use the 2180 the other way around. I would like to be able to use it to turn the 0dB-level-position down (damping or dim circuit). This is actually possible, but the mentioned "translation" of the linear control path of the connected potentiometer into a logarithmic output curve is invariably wired inside the THAT-IC. So if I now simply turn a linear potentiometer to the left in order to obtain the attenuation of the signal, I only have a very rough control option here (starting from the 0dB position of the potentiometer). Because that is exactly the meaning of a logarithmic behavior, that I can control the volume very sensitively in the initial control range (with a longer mechanical path), and at the end it then becomes loud very quickly (with a very short mechanical path).
But I would like to have exactly this long control range exactly "mirrored". So I would like to be able to turn it more quietly in the 0dB-position (further mechanical path), maybe down to -40 dB. After that it can get quieter very quickly.
How would I have to wire the THAT2180 externally to get this result? Can any of you help me?
Maris
I would now like to use the 2180 the other way around. I would like to be able to use it to turn the 0dB-level-position down (damping or dim circuit). This is actually possible, but the mentioned "translation" of the linear control path of the connected potentiometer into a logarithmic output curve is invariably wired inside the THAT-IC. So if I now simply turn a linear potentiometer to the left in order to obtain the attenuation of the signal, I only have a very rough control option here (starting from the 0dB position of the potentiometer). Because that is exactly the meaning of a logarithmic behavior, that I can control the volume very sensitively in the initial control range (with a longer mechanical path), and at the end it then becomes loud very quickly (with a very short mechanical path).
But I would like to have exactly this long control range exactly "mirrored". So I would like to be able to turn it more quietly in the 0dB-position (further mechanical path), maybe down to -40 dB. After that it can get quieter very quickly.
How would I have to wire the THAT2180 externally to get this result? Can any of you help me?
Maris