meng-qi/dplpg
DPLPG
Dual passive low-pass gate with two independent vactrol/opto-coupler channels, each with a -6 dB/oct slope. Fully passive — no power required. A trigger pulse drives the natural decay behaviour of the opto couplers, producing the classic bongo-like envelope response.477
Capabilities 2
- Lowpass Gatelowpass-gate
- Two independent passive low-pass gate channels, each with -6 dB/oct slope, using opto couplers. Produces the classic bongo-like decay envelope from a simple trigger pulse.477
- Vactrol-basedvactrol
- Two independent vactrol / opto-coupler channels. The vactrol's natural decay response IS the envelope — no internal AR generator.477
Jacks 6 — 4 in / 2 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (4) | |||
| CH1 In | audio | — | Channel 1 audio input. DC-coupled through the channel's vactrol; level at the output depends on the vactrol's instantaneous resistance, driven by CH1 Trig.477 |
| CH1 Trig | gate | — | Channel 1 trigger / CV input. Drives the vactrol LED — a trigger pulse opens the gate and lets it decay via the vactrol's natural response curve, producing the characteristic bongo-like envelope. DC voltage holds the gate open continuously.477 |
| CH2 In | audio | — | Channel 2 audio input. Independent from CH1. Same DC-coupled vactrol-based topology.477 |
| CH2 Trig | gate | — | Channel 2 trigger / CV input. Same vactrol-driven envelope behavior as CH1 Trig. Channel-to-channel variation is intentional (vactrol asymmetry presented as a sonic feature, not a bug).477 |
| Outputs (2) | |||
| CH1 Out | audio | — | Channel 1 audio output. The CH1 In signal attenuated by the vactrol's resistance at any moment. Slope is 1-pole (-6 dB/octave) per channel.477 |
| CH2 Out | audio | — | Channel 2 audio output. Independent from CH1. 1-pole (-6 dB/octave) slope.477 |
Parameters 0
No parameters recorded.
Firmware history 0 versions
No firmware history recorded.
References 2
- [477]
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[478]
Meng Qi DPLPG at SchneidersLaden (retailer)product_page● verified 2026-05-17