Motivation

VCA LN

A well known way to reduce noise in VCA is using the VCA's in parallel. Here is my approach. A LM13700 used in parallel reduces the noise floor around 3dB.




Specs and features


Implementation

Schematic

VCA LN schematic

VCA LN schematic 01


Description:

Nothing special here. Just two plain forward designed VCA with LM13700. With the signals added together.


VCA LN schematic

VCA LN schematic 02


Description:

Standard circuitry for Iabc and level control.


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Calibration

  • t.b.d.
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Special parts

  • None.

Download

VCA LN documentation download


VCA LN PCB

VCA LN: populated PCB


2018 March

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