This article is for a set of empty PCBs used for building Avalon Harmonics iVCA yourself. DOES NOT CONTAIN ANY COMPONENTS.NOTE: This build requires soldering a very tiny BCM847BS SMD dual transistor package. GitHub BOM & Source: https://github.com/Thorinair/Avalon-Harmonics/tree/master/Modules/iVCA Includes:1x Avalon Harmonics iVCA Panel PCB1x Avalon Harmonics iVCA Front PCB1x Avalon Harmonics iVCA Main PCB iVCA is a simple stereo VCA, with a focus on manipulating the incoming CV by allowing for full range offsetting and attenuverting. The VCA circuits are a classic simple transistor type. The L and R IN jacks accept an incoming audio signal, while the L and R OUT jacks are for the output. The inputs have around 14 Vpp capacity and are best suited for audio signals. VOL knob can be used to adjust the volume of the incoming signals and can be used to tame very loud signals if necessary. When set above around 3 o'clock, the signals will have some additional gain applied to them. The main focus of the module is to allow for easy manipulation of the control signal. OFS knob can be used to offset the CV signal in a full range into both positive and negative values. It can also be used to fully open the VCA when turning it all the way clockwise. ATN knob is an attenuverter for the CV signal. The signal has no effect when set to the middle, has around 2x the effect when set all the way clockwise, and around 2x the inverted effect when set all the way counter-clockwise. This allows the module to be easily adjusted to behave like a normal VCA to control notes, or as a ducking effect to do some sidechain action.Thanks to the multiplied CV input, the VCA can fully open even with a 5V CV input. Both knobs have a centre detent for easier tactile use. A bipolar LED is also included and shows the current state of the CV. Green represents positive values, while red represents negative values. This allows for easy monitoring how the CV is affecting the audio signals, even when there is nothing to be heard. Website Page: https://avalon-harmonics.com/module/iVCA/ModularGrid Page: https://modulargrid.net/e/avalon-harmonics-ivca Features:- Compact 4 HP design- Input volume knob with some extra gain- CV full range offset and attenuverter knobs- VCAs fully open with 5V CV- Status LED for CV- Wrong polarity protection- Size: 4HP- Depth: 36mm- Power: +12V: 22mA, -12V: 22mA
