The Vactrol LP filter module is a passive circuit which filters a signal entering “IN” and leaving “OUT” by the action of a CV signal acting on a low-pass filter, via a “vactrol”.The attenuator acts on the CV IN signal.
A selector allows you to choose between standalone (“default”) mode with a filter setting I defined and “user” mode.The “user” mode is interesting because it allows you to test different capacitors (3 different values are supplied with the module) to refine your choice of low-pass filter. Simply insert a capacitor of your choice into the slot provided for this purpose. Of course, you can test any values you want 🙂Note that this selector also allows you to listen to the signal without a filter (if no capacitor is inserted).
An RGB LED indicates the status of the CV IN signal. This LED influences the CV IN signal, especially at higher voltages/octaves.You can disable the jumper on the back of the module or keep this setting to take advantage of this signal instability.
Available with red, black or white panel.
Price: 34€ (without shipping costs).
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Specifications :Size 2HP, epoxy panel 1,6 mm.Deep : 25mm (skiff friendly).PCB in epoxy FR4 dual layer, 1,6 mm. Surface finish HASL.Components tested and assembled by hand, in Brittany, France.Available as an assembled Module, no kit.In the box : M3 & nylon nuts.No consumption (passive module).
Little Kypski demo (thanks to him!)