Retroaktiv HLFO – Panel / PCB Set

From: £30.00 (Excl. VAT)

Performance LFO, Noise, S&H, Touch Controller, Mod Wheel Interface

Note: This is a Panel/PCB Set only – For a Full Kit go here

Thonkiconn × 8

B100K - Song Huei TALL Trimmer Potentiometer × 2

B50K - D shaft - Alpha Vertical 9mm Potentiometer × 2

Out of Stock

SKU: Bundle_Retroaktiv_HLFO Categories: , , , , Brand:


The HLFO (Haptic Low-Frequency Oscillator) is a 10HP performance module for Eurorack modular systems. The core of the module features a voltage-controlled LFO, which can have it’s rate and amplitude controlled using the on-board touch sensor (FSR), with external CV control also possible.

The LFO features triangle, square, and random (S&H) output waveforms. The sample and hold generator samples the HLFO’s internal noise source, to generate a random waveform. The internal S&H generator has its own separate output (pre-VCA) and can sample any external voltage source by plugging into the SRC jack. The S&H can also be clocked externally by plugging a clock signal into the CLK jack. The NOISE output features a white noise generator (5Vpp).

The on-board touch sensor has an output range of 0 to 5VDC. The FSR signal is normalised to the RATE and AMP controls. Plugging into the RATE or AMP jack will disconnect the FSR from that control. The HLFO has a rear panel jumper to select the speed range of the LFO. At the normal setting, the LFO ranges from around .25Hz to 125Hz. At slower settings, the LFO is capable of generating waveforms with periods of over 45 seconds.

This combination of functions allows for an extremely flexible waveform generation tool, LFO, noise source, sample & hold, touch controller, mod wheel interface, aftertouch interface, and more.

Note: This project features mainly SMD components,

This is a Panel / PCB Set only – Pots, knobs & Jacks are available to add optionally


HLFO Build Guide

HLFO Operation Manual

HLFO Schematic (password provided with purchase)

Additional information

HP Size


Weight 0.0017 kg

B100K - Song Huei TALL Trimmer Potentiometer

Weight 0.0019 kg

B50K - D shaft - Alpha Vertical 9mm Potentiometer

Weight 0.00493 kg

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