# LPG / LPF Passive Vactrol Module

Passive Vactrol LPG / LPF  Low Pass Filter, Modular Synth Eurorack

- **Seller:** [Data Point Ltd](https://lectronz.com/stores/datapoint), Portsmouth, UK
- **Price:** £23.00 (GBP, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Synth, Audio
- **Product page:** https://lectronz.com/products/lpg-lpf-passive-vactrol-module

## Options

**Options**

- Board Only
- Board with Eurorack Plate [Add £5.62]

## Images

![LPG / LPF Passive Vactrol Module](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjMyODYsInB1ciI6ImJsb2JfaWQifX0=--aab668b8f9a68dfb26ca522d16a63c2ff673c8b5/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2026-06-10T14-36-47.748Z-LPG_LPF_Front.jpg)
![LPG / LPF Passive Vactrol Module](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjMyODcsInB1ciI6ImJsb2JfaWQifX0=--96340abf5e1bde7db54657c0d8bb240a8fc01c32/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2026-06-10T14-36-47.748Z-LPG_LPF_Rear_L.jpg)
![LPG / LPF Passive Vactrol Module](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjMyODgsInB1ciI6ImJsb2JfaWQifX0=--47ddacacb5e0b8a617d38aa8b92d778b96cbe7c9/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/2026-06-10T14-36-47.748Z-LPG_LPF_Front_2..jpeg)
![LPG / LPF Passive Vactrol Module](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjMyODksInB1ciI6ImJsb2JfaWQifX0=--f1a0ba4090d6771d45a9c1a5f21943069b874b6b/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2026-06-10T14-36-47.748Z-LPG_LPF_Plate_1.jpg)
![LPG / LPF Passive Vactrol Module](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjMyOTAsInB1ciI6ImJsb2JfaWQifX0=--d6d40c6245071a516d4fdb1788a50cf5e8425ec6/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2026-06-10T14-36-47.748Z-LPG_LPF_Plate_3.jpg)
![LPG / LPF Passive Vactrol Module](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjMyOTEsInB1ciI6ImJsb2JfaWQifX0=--b73d27246329351490697410b06dbd14435709f9/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2026-06-10T14-36-47.748Z-LPG_LPF_Plate_2.jpg)
![LPG / LPF Passive Vactrol Module](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjMyOTIsInB1ciI6ImJsb2JfaWQifX0=--d73f0af978a8dfd51899df9e6866f2e7e237c9b6/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2026-06-10T14-36-47.748Z-LPG_LPF_Rear_R.jpg)
![LPG / LPF Passive Vactrol Module](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NjMyOTMsInB1ciI6ImJsb2JfaWQifX0=--e815f5c872defcd3786c8879691fd9e31b227c70/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2026-06-10T14-36-47.748Z-LPG_LPF_Top.jpg)

## Description

This compact module combines a Low Pass Filter (LPF) and Low Pass Gate (LPG) in a simple passive design using a vactrol response for smooth, organic filtering and natural decay characteristics. Ideal for adding warm, percussive tones and classic “woody” LPG behaviour to modular patches.

Selectable operating modes allow use as:

- Low Pass Filter (LPF)
- Low Pass Gate (LPG)
- Bypass

The vactrol-based circuit gives a soft, musical response that works especially well with plucks, percussion, drones, and experimental patches.

### Specifications:

- Passive (vactrol-based) design
- CV / Gate input
- Audio input
- Audio output
- Cutoff control
- Mode switch: LPF / LPG / Bypass
- 3.5mm jacks (Eurorack compatible)
- 6HP Eurorack Plate (available separately)

### Measurements:

- 46mm x 74mm x 23mm
- 4 x 2mm mount holes

### About Vactrols

A vactrol is an optoelectronic component combining an LED and a light-dependent resistor (LDR) in a sealed housing. As the LED brightness changes, the resistance changes smoothly, creating the characteristic warm, natural, and slightly slow response highly valued in many classic LPG designs.