4 layers84 × 58 mm
Flashover Controls
Cherry-Blossom-Development/GreywireStudio
GreywireStudio - a combined software/hardware product
68 parts
4 layers87.6 × 84 mm
GreywireStudio - a combined software/hardware product
- Size
- 87.6 × 84 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 95
- Nets
- 94
- Pads
- 370
- Tracks, vias
- 969, 221
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 3 Oct 2026
- Updated
- 7 Nov 2026
Overview
Flashover is an open-source printed circuit board by Cherry-Blossom-Development, from the Cherry-Blossom-Development/GreywireStudio repository on GitHub. It is a 4-layer board of 87.6 × 84 mm with 95 parts on 94 nets, routed with 969 tracks and 221 vias.
It is built around the RP2040, TL072 and W25Q16JVSSIQ, with the MCP45HV51-103E/ST, AP2112K-3.3 and H11L1 among its other parts. Its parts include 34 capacitors, 28 resistors, 10 ICs, 8 diodes and 7 connectors. It belongs with the audio and music boards and the RP2040 boards of this library.
Main components
12
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
W25Q16JVSSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 10uA 133MHz 16Mbit 2.7V~3.6V 20 Years 3ms SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
MCP45HV51-103E/ST
TSSOP-14-40℃~+125℃ 0.5LSB 1 10V~36V 10kΩ 15ppm/℃ 240kHz 256 3uA 75Ω I2C Linear Power-on reset、Zero-crossing detection RAM ±20% TSSOP-14 Digital Potentiometers ROHSMicrochip TechnologyDigital Potentiometers
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
H11L1
DIP-6-55℃~+100℃ 1 1.6mA 1Mbit/s 250mW 3V~15V 5kV DC DIP-6 Logic Output Optoisolators ROHSEverlight ElectronicsLogic Output Optoisolators
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsMCP45HV51-104E/ST
TSSOP-14-40℃~+125℃ 1 100kΩ 10V~36V 24kHz 256 50ppm/℃ 75Ω I2C Linear Power-on reset、Zero-crossing detection ±20% TSSOP-14 Digital Potentiometers ROHSMicrochip TechnologyDigital Potentiometers
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes1N34A
DO-7DO-7 Diodes - General Purpose ROHSNTE ElectronicsDiodes - General Purpose
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdGreywireStudio
GreywireStudio is a line of guitar effects pedals from Cherry Blossom Development. The first series, Linework, is a set of pedals that work on their own or together under a phone-connected control pedal. See General Concept.docx for the overall product concept. Linework Control Specification.docx defines the rules every Linework pedal follows: the MIDI loop connecting them to Switchyard, the shared message map, presets and firmware updates.
Tools
All tools are free:
| Tool | Purpose |
|---|---|
| KiCad | Schematic capture and PCB layout |
| LTspice | Circuit simulation (gain, clipping, tone response) |
Layout
libraries/
GreywireStudio.kicad_sym # Shared KiCad symbols (e.g. 3PDT footswitch)
pedals/
<pedal-name>/
README.md # Design notes, parts list, status
*Product Document.docx # Product definition
kicad/ # KiCad project (schematic + PCB)
sim/ # LTspice simulations (.asc)Pedals
| Pedal | Name | Type | Status |
|---|---|---|---|
| Distortion | Flashover | Distortion / overdrive | Design |
| Controller | Switchyard | Control pedal (phone-connected) | Concept |
| Controller with audio | Switchyard Audio | Control pedal plus digital effects | Planning |
| Boost | Tap Changer | Clean boost | Design |
| Phaser | Three Phase | Analog phaser | Idea |
| Tremolo | Rolling Blackout | Analog (optical) tremolo | Idea |
| Chorus | Double Circuit | Analog (bucket brigade) chorus / vibrato | Idea |
Product names are working names pending a trademark search (see IP_RESEARCH.md).
The public website is https://greywirestudio.com, kept in the GreywireStudio-Website repository.
Parts
95| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 100n | Capacitor_SMD:C_0805_2012Metric | C10, C11, C14, C17, C18, C19, C20, C21, C22, C23, C24, C26, C27, C28, C41, C42 |
| 5 | 10k | Resistor_SMD:R_0805_2012Metric | R2, R6, R17, R20, R45 |
| 5 | 1M | Resistor_SMD:R_0805_2012Metric | R1, R3, R7, R8, R10 |
| 5 | 1N4148W | Diode_SMD:D_SOD-123 | D4, D5, D6, D43, D44 |
| 4 | 100k | Resistor_SMD:R_0805_2012Metric | R5, R11, R13, R44 |
| 4 | 1u | Capacitor_SMD:C_0805_2012Metric | C16, C25, C31, C32 |
| 4 | 4.7k | Resistor_SMD:R_0805_2012Metric | R12, R21, R22, R43 |
| 2 | 10u | Capacitor_SMD:CP_Elec_5x5.4 | C6, C15 |
| 2 | 15p | Capacitor_SMD:C_0805_2012Metric | C29, C30 |
| 2 | 1N34A | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric | R19, R38 |
| 2 | 1n | Capacitor_SMD:C_0805_2012Metric | C2, C5 |
| 2 | 1u | Capacitor_SMD:C_1210_3225Metric | C4, C9 |
| 2 | 6.8k | Resistor_SMD:R_0805_2012Metric | R14, R15 |
| 2 | G6K-2F-Y 5VDC | Relay_SMD:Relay_DPDT_Omron_G6K-2F-Y | K1, K2 |
| 2 | M3 | MountingHole:MountingHole_3.2mm_M3 | H1, H2 |
| 2 | MCP45HV51-103 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U8, U9 |
| 2 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 1 | 10 | Resistor_SMD:R_0805_2012Metric | R40 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric | R18 |
| 1 | 100n | Capacitor_SMD:C_1206_3216Metric | C8 |
| 1 | 100u | Capacitor_SMD:CP_Elec_6.3x5.4 | C7 |
| 1 | 10n | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | 12MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 220 | Resistor_SMD:R_0805_2012Metric | R37 |
| 1 | 22n | Capacitor_SMD:C_1206_3216Metric | C12 |
| 1 | 30k | Resistor_SMD:R_0805_2012Metric | R16 |
| 1 | 33 0.5W | Resistor_SMD:R_2010_5025Metric | R39 |
| 1 | 330 | Resistor_SMD:R_0805_2012Metric | R4 |
| 1 | 330n | Capacitor_SMD:C_0805_2012Metric | C13 |
| 1 | 470n | Capacitor_SMD:C_1210_3225Metric | C3 |
| 1 | 9V DC | Connector_BarrelJack:BarrelJack_CUI_PJ-102AH_Horizontal | J3 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U6 |
| 1 | Footswitch | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | SW5 |
| 1 | H11L1 | Package_DIP:SMDIP-6_W7.62mm | U11 |
| 1 | Input | Connector_Audio:Jack_6.35mm_Neutrik_NRJ4HF_Horizontal | J1 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U3 |
| 1 | LM741 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | MCP45HV51-104 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U7 |
| 1 | MIDI In | Connector_Audio:Jack_3.5mm_CUI_SJ1-3523N_Horizontal | J5 |
| 1 | MIDI Out | Connector_Audio:Jack_3.5mm_CUI_SJ1-3523N_Horizontal | J6 |
| 1 | Output | Connector_Audio:Jack_6.35mm_Neutrik_NRJ4HF_Horizontal | J2 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U4 |
| 1 | SS14 | Diode_SMD:D_SMA | D3 |
| 1 | SWD | Connector_JST:JST_SH_SM03B-SRSS-TB_1x03-1MP_P1.00mm_Horizontal | J4 |
| 1 | TL072 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | To control board | Connector_PinSocket_2.54mm:PinSocket_2x10_P2.54mm_Vertical | J7 |
| 1 | W25Q16JVSS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U5 |
Questions
How big is the Flashover PCB?
It measures 87.6 × 84 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Flashover use?
95 parts, built around the RP2040, TL072, W25Q16JVSSIQ and MCP45HV51-103E/ST. 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 Flashover KiCad files?
From the Cherry-Blossom-Development/GreywireStudio repository on GitHub, at the commit this page was made from: the board is pedals/distortion/kicad/Flashover/Flashover.kicad_pcb and its schematic pedals/boost/kicad/TapChanger/TapChanger.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Flashover design in my own project?
Its repository states no licence, so its author keeps all rights: ask Cherry-Blossom-Development before reusing the design.
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