4U – FULL KIT (SMD pre-soldered) – Setonix – Boing! (Discrete Transistor Low Pass Gate)

£41.00 (exc VAT)

4U User’s Manual

4U Build Manual

4U Bill of Materials

4U Interactive BOM

This listing is for a full kit, everything you need to build a working 4U module (including power cable).


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The Boing! is a Light Dependent Resistor-controlled low pass gate. It takes its primary inspiration from ultra-simple yet delightful passive Vactrol Low Pass Gate modules such as the PassiVac and DPLPG, but adds JFET transistor input and output stages and an active LED control circuit, thus enabling the introduction of wonderful Damping (negative feedback) and Trigger functions, LED brightness offset, and a second filter stage. Combined, these features allow for incredible variable-cutoff overdrive and all pass filter sounds in addition to bouncy LPG Bongos and more.

This module is a Loudest Warning-format 4U module with a width of 1”, consuming approx. 12mA of power on the +12V rail.

This DIY kit contains a panel, fully populated PCB, and all hardware and components needed to make a complete Boing! module. Due to the nature of DIY kits, we can offer advice but cannot accept returned kits that have been partially assembled.




Additional information

Weight 100 g
Dimensions 128.5 × 50 × 50 mm
HS Code





Synthesiser parts/components

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