# 1u dual vca

![1u dual vca](/1u dual vca panel.png "1u dual vca")

The 1u dual vca is 6hp in width, it has two channels each forming a row with a
signal input, control voltage input, and signal output jack appearing from left
to right on the front panel. Built around the [AS3360D][as3360] IC, the signal
input maximum is 20Vpp, the signal output maximum is 10Vpp, depending on the
resistor configuration each vca will become fully open according to the
following table:

|     |        vca 1        |         vca 2         |
|:---:|:-------------------:|:---------------------:|
|  5V |  R7 = 30k, R8 = 24k |  R12 = 30k, R11 = 24k |
|  8V | R7 = 100k, R8 = 47k | R12 = 100k, R11 = 47k |
| 10V |  R7 = 47k, R8 = 47k |  R12 = 47k, R11 = 47k |

[as3360]: http://www.alfarzpp.lv/eng/sc/AS3360.pdf