2 layers60.2 × 50.8 mm
ArduinoSpecAn
andreasb242/OpenNetworkAnalyzer
Improved software for https://hackaday.io/project/10021-arduino-network-analyzer
49 parts1GPL-3.0
2 layers145.3 × 108.8 mm
Level gate screamer
vermiscore/level-gate-screamer1Tube Screamer-style overdrive with a level gate: attenuates below threshold, boosts above
- Size
- 145.3 × 108.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 134
- Nets
- 79
- Pads
- 340
- Tracks, vias
- 780, 130
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 9 Oct 2026
- Updated
- 10 Oct 2026
Overview
Level gate screamer is an open-source printed circuit board by vermiscore, from the vermiscore/level-gate-screamer repository on GitHub, published under the MIT licence. It is a 2-layer board of 145.3 × 108.8 mm with 134 parts on 79 nets, routed with 780 tracks and 130 vias.
It is built around the LM7301IM, MMBF5457 and NMJ6HFD2-AU. Its parts include 60 resistors, 39 capacitors, 7 ICs, 6 diodes and 6 transistors. It belongs with the audio and music boards of this library.
Main components
3
LM7301IM
SOIC-8-40℃~+85℃ 1 1.25V/us 1.8V~32V 10.9mA 2uV/℃ 30uV 36nV/√Hz@1kHz 4MHz 600uA 70nA 90nA 93dB Rail-to-Rail Input, Rail-to-Rail Output SOIC-8 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
MMBF5457
SOT-23SOT-23 Audio Amplifiers ROHSonsemiAudio Amplifiers
NMJ6HFD2-AU
插件Plugin Audio Connectors ROHSNeutrikAudio Connectors (Headphones)
README
README.mdlevel-gate-screamer
Tube Screamer-style overdrive with a level gate: attenuates below threshold, boosts above
[!WARNING] v1: J2/J3 footprints are rotated 180°. Fix with jumpers on the bottom side:
- J2: 1–6, 2–5
- J3: 1–6, 4–2
Next revision: rotate J2/J3 so the big protrusion faces the board edge.
Output level: up to ~9 Vpp (rail-to-rail op-amps on 9 V). Check the input range of the next device before connecting. Tested OK with a Neural DSP Nano Cortex.
Files
kicad_files/— KiCad projectfabrication/— Gerber, BOM, CPL for JLCPCBhand_soldered_parts/— parts not assembled by JLCPCBsimulation/— ngspice netlist
Images
Finished PCB
PCB just arrived
PCB layout (KiCad)
Schematic
Labeled as "OTA boost", but this isn't an OTA.
Level gate concept
Simulation: input above threshold (amplified)
Simulation: input below threshold (attenuated)
Impressions
- Sounds great
- Easy to play
- The gate works as intended
References
- UC3Music/IceScreamer — base Tube Screamer design and footprints
- ElectroSmash Archive: Tube Screamer Analysis
- ElectroSmash Archive: MXR MicroAmp Analysis — boost stage
- PCB Guitar Mania: No-Noise Gate building docs (PDF) — noise gate
- Elliott Sound Products: VCA Techniques Investigated — JFET VCA (Figure B)
- Boss NS-2 — gate idea: detect on the dry signal, mute after the gain stage
Parts
134| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100nF | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C13, C18, C23, C25, C26, C27, C28, C53 |
| 8 | 10K | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R20, R24, R25, R28, R63, R67, R70, R72 |
| 7 | 1M | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5, R8, R12, R17, R18, R34, R333 |
| 7 | LM7301 | easyeda2kicad:SOT-23-5_L2.9-W1.6-P0.95-LS2.8-BL | U1, U2, U3, U5, U6, U8, U9 |
| 5 | 100k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R15, R32, R56, R59, R444 |
| 5 | 10k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R11, R16, R38, R58, R62 |
| 5 | 10u | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C7, C8, C9, C11, C15 |
| 5 | 1K | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R27, R52, R64, R66, R211 |
| 4 | 10n | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2, C5, C6, C12 |
| 4 | 1u | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C4, C16, C17, C20 |
| 4 | 22k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R3, R13, R222, R555 |
| 4 | NPN_BC847B | Package_TO_SOT_SMD:SOT-23 | Q2, Q6, Q7, Q21 |
| 3 | 2.2M | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R6, R55, R57 |
| 3 | NMJ6HFD2 | IceScreamer:IceJACK | J2, J2, J3 |
| 2 | 100 | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R19, R61 |
| 2 | 1N4148 | Diode_SMD:D_SOD-123 | D8, D9 |
| 2 | 220nF | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C46, C50 |
| 2 | 220uF | IceScreamer:CP_Radial_D6.3mm_P2.50mm | C14, C24 |
| 2 | 4.7k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R23, R111 |
| 2 | 470K | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R69, R223 |
| 2 | 47n | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C3, C10 |
| 2 | 47p | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C22, C39 |
| 2 | LED | LED_SMD:LED_0805_2012Metric | D2, D4 |
| 2 | Q_NJFET_GDS | easyeda2kicad:SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q1, Q4 |
| 2 | log 500K | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | POT2, POT3 |
| 1 | 0.1u | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C36 |
| 1 | 1.8k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R14 |
| 1 | 10 | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R60 |
| 1 | 100R | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R71 |
| 1 | 100n | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C37 |
| 1 | 100u | IceScreamer:CP_Radial_D6.3mm_P2.50mm | C38 |
| 1 | 10M | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R51 |
| 1 | 10uF | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C54 |
| 1 | 150k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R9 |
| 1 | 15u | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C40 |
| 1 | 1N4001 | Diode_SMD:D_SMA | D3 |
| 1 | 1k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R10 |
| 1 | 1uF | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C52 |
| 1 | 2.2k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R31 |
| 1 | 2.2u | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1 |
| 1 | 2.7k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R50 |
| 1 | 200k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R35 |
| 1 | 220R | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R65 |
| 1 | 22M | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R49 |
| 1 | 22n | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C19 |
| 1 | 3.3k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R4 |
| 1 | 4.7u | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C35 |
| 1 | 470 | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R54 |
| 1 | 470k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R7 |
| 1 | 47k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R26 |
| 1 | 47nF | IceScreamer:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C21 |
| 1 | 5.1v | Diode_SMD:D_SOD-123 | D1 |
| 1 | 56k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R53 |
| 1 | 9.53k | IceScreamer:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R33 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_CLIFF_FC681465S_SMT_Horizontal | J1 |
| 1 | Battery_Cell | Battery:BatteryHolder_MPD_BA9VPC_1xPP3 | BT1 |
| 1 | Conn_01x10_Pin | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J4 |
| 1 | SW_TPDT | IceScreamer:IceStomp_Switch_3PDT | SW1 |
| 1 | lin 20k | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | POT7 |
| 1 | log 100K | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | POT8 |
| 1 | log 500k | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | POT4 |
The 130 most common of 134 parts.
Questions
How big is the Level gate screamer PCB?
It measures 145.3 × 108.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Level gate screamer use?
134 parts, built around the LM7301IM, MMBF5457 and NMJ6HFD2-AU. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Level gate screamer KiCad files?
From the vermiscore/level-gate-screamer repository on GitHub, at the commit this page was made from: the board is kicad_files/v1.kicad_pcb and its schematic kicad_files/v1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Level gate screamer design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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