2 layers112 × 80 mm
2 layers55.4 × 66 mm
OwmBoard
kanengomibako/EffectsPedals14- Size
- 55.4 × 66 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 166
- Nets
- 103
- Pads
- 398
- Tracks, vias
- 1,070, 81
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 4 Jul 2025
- Updated
- 15 Jun 2026
Overview
OwmBoard is an open-source printed circuit board by kanengomibako, from the kanengomibako/EffectsPedals repository on GitHub, published under the Unlicense licence. It is a 2-layer board of 55.4 × 66 mm with 166 parts on 103 nets, routed with 1,070 tracks and 81 vias.
It is built around the OPA1678ID, 78L05 and 78L33, with the B10 among its other parts. Its parts include 50 connectors, 45 resistors, 44 capacitors, 8 ICs and 2 diodes.
Main components
4
OPA1678ID
SOIC-8-150mil-18V~-2.25V、2.25V~18V -40℃~+85℃ 10pA 10pA 110dB 16MHz 2 2mA 2uV/℃ 4.5V~36V 4.5nV/√Hz@1kHz 500uV 50mA 9V/us Built-in compensation、ESD protection Rail-to-rail output SOIC-8-150mil Operational Amplifier ROHSTexas InstrumentsAudio Amplifiers
78L05
SOT-89-3-20℃~+120℃@(Tj) 1 1.7V 100mA 2mA 30V 40uV 49dB@(120Hz) 5V Fixed Over Temperature Protection、Short Circuit Protection Positive SOT-89-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSUMWVoltage Regulators - Linear, Low Drop Out (LDO) Regulators78L33
SOT-89-20℃~+120℃@(Tj) 1 1.7V 150mA 20V 2mA 3.3V 40uV 49dB@(120Hz) Fixed Over Temperature Protection、Short Circuit Protection Positive SOT-89 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSUMWVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsB10
-- Body Worn CameraMALUCPUncategorised
README
PedalMeetingHeadphoneAmp/README.mdPedal Meeting Headphone Amp
エフェクター展示会の試奏ブースでのコミュニケーションを円滑にするために設計されたヘッドフォンアンプです。ギター／ベースの音と会話用のマイク音声をミックスし、ヘッドフォンで聴くことができます。試奏者と出展者が音を共有できると共に、ヘッドフォンを外さずに会話することが可能となります。
※ 電源は、DC9V（センターマイナス）出力のACアダプターで、0.3A以上の電流出力が可能なものを使用してください。
■ 入力
それぞれ独立したゲイン調整を備えています。ゲインを上げ過ぎるとハウリングが起こることがありますのでご注意ください。
-
INST
楽器側の音声出力を接続します。アンプ・キャビネットシミュレータからの接続を想定しています。ゲインは基本的に中央で固定し、微調整として使用してください。
-
MIC1／MIC2
外部マイクを接続します。48Vファンタム電源が必要なマイクには対応していません。
-
MIC3
本体トップ面にあるマイクです。外部マイクがない場合でも、会話を拾うことが可能です。
■ 出力
楽器の音とマイクの音をそれぞれ出力ボリュームで調整できます。
-
PHONES A／B
試奏者用、出展者用のヘッドフォンを接続します。
-
LINE A／B
外部録音機器を接続できます。
■ スイッチ
-
MIC ON／OFF
すべてのマイク入力を一括でミュートします。マイクが楽器の生音を拾うため、会話時以外はマイクをOFF（LED消灯）にすることをお勧めします。
-
MIC 5V
プラグインパワー方式のコンデンサーマイク（BEHRINGER BC LAV 等）を使用する際にONにします。ダイナミックマイク接続時はOFFにします。48Vファンタム電源が必要なマイクには対応していません。
■ 資料
| ■ 主な仕様 | |
|---|---|
| 入力インピーダンス | 47kΩ（INST） 10kΩ（MIC） |
| 出力インピーダンス | 1 kΩ（LINE） 10Ω（PHONES） |
| 最大出力レベル | 2.5 Vrms（LINE） 50 mW + 50 mW, 32Ω（PHONES） |
| コントロール | MIC ON／OFFスイッチ MIC 5Vスイッチ GAINつまみ × 4 VOLつまみ × 4 |
| インジケーター | 赤色LED（電源ON） 青色LED（マイクON） |
| 接続端子 | INST MIC1／2 PHONES A／B LINE A／B 電源入力端子 |
| 消費電流 | 40 mA（無信号時） 300 mA（最大出力時） |
| 外形寸法 | 幅 100 mm × 奥行 130 mm × 高さ 57 mm |
| 質量 | 550 g |
Parts
166| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | 10k | myFoot:my_R_1608(0603)_HandSoldering | R3, R10, R13, R14, R15, R16, R17, R18, R23, R24, R25, R26, R27, R28, R34, R36 +5 |
| 16 | 100n | myFoot:my_C_1608(0603)_HandSoldering | C22, C23, C24, C25, C30, C31, C32, C33, C34, C35, C36, C37, C38, C39, C40, C42 |
| 6 | 100R | myFoot:my_R_2012(0805)_HandSoldering | R5, R6, R11, R12, R21, R31 |
| 5 | 10u | myFoot:my_C_3216(1206)_HandSoldering | C26, C27, C28, C29, C43 |
| 4 | 100k | myFoot:my_R_1608(0603)_HandSoldering | R22, R32, R43, R44 |
| 4 | 1n | myFoot:my_C_1608(0603)_HandSoldering | C5, C6, C10, C11 |
| 4 | 2.2k | myFoot:my_R_1608(0603)_HandSoldering | R19, R20, R29, R30 |
| 4 | 20p | myFoot:my_C_1608(0603)_HandSoldering | C15, C16, C17, C18 |
| 4 | 220p | myFoot:my_C_1608(0603)_HandSoldering | C7, C8, C12, C13 |
| 3 | 1k | myFoot:my_R_2012(0805)_HandSoldering | R1, R7, R38 |
| 3 | AGND | myFoot:my_SmallPad_0-8mmDrill | J49, J51, J52 |
| 3 | OPA1678 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U2, U3 |
| 2 | (10k) | myFoot:my_R_1608(0603)_HandSoldering | R37, R40 |
| 2 | 100n | myFoot:my_C_3225(1210)_HandSoldering | C1, C3 |
| 2 | 100u | myFoot:my_C_D6.3mm_P2.50mm | C21, C41 |
| 2 | 10n | myFoot:my_C_1608(0603)_HandSoldering | C2, C4 |
| 2 | 10u | myFoot:my_CP_Elec_5 | C9, C14 |
| 2 | 1M | myFoot:my_R_1608(0603)_HandSoldering | R2, R8 |
| 2 | 2.2M | myFoot:my_R_1608(0603)_HandSoldering | R35, R45 |
| 2 | 2u2 | myFoot:my_C_2012(0805)_HandSoldering | C19, C20 |
| 2 | 3.3VD | myFoot:my_SmallPad_0-8mmDrill | J17, J18 |
| 2 | 78L05 | Package_TO_SOT_SMD:SOT-89-3 | U6, U8 |
| 2 | DGND | myFoot:my_SmallPad_0-8mmDrill | J19, J20 |
| 1 | (4u7) | myFoot:my_C_3216(1206)_HandSoldering | C44 |
| 1 | 12.288MHz | Crystal:Crystal_SMD_HC49-SD | Y1 |
| 1 | 1N4007 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D2 |
| 1 | 330R | myFoot:my_R_2012(0805)_HandSoldering | FB1 |
| 1 | 47k | myFoot:my_R_1608(0603)_HandSoldering | R33 |
| 1 | 7805 | myFoot:my_TO-252-3 | U7 |
| 1 | 7833 | myFoot:my_TO-252-3 | U9 |
| 1 | 78L33 | Package_TO_SOT_SMD:SOT-89-3 | U10 |
| 1 | 8MHz | Crystal:Crystal_SMD_HC49-SD | Y2 |
| 1 | A0 | myFoot:my_SmallPad_0-8mmDrill | J21 |
| 1 | A1 | myFoot:my_SmallPad_0-8mmDrill | J22 |
| 1 | A10 | myFoot:my_SmallPad_0-8mmDrill | J30 |
| 1 | A11 | myFoot:my_SmallPad_0-8mmDrill | J31 |
| 1 | A12 | myFoot:my_SmallPad_0-8mmDrill | J32 |
| 1 | A15 | myFoot:my_SmallPad_0-8mmDrill | J47 |
| 1 | A2 | myFoot:my_SmallPad_0-8mmDrill | J23 |
| 1 | A3 | myFoot:my_SmallPad_0-8mmDrill | J24 |
| 1 | A4 | myFoot:my_SmallPad_0-8mmDrill | J25 |
| 1 | A5 | myFoot:my_SmallPad_0-8mmDrill | J26 |
| 1 | A6 | myFoot:my_SmallPad_0-8mmDrill | J27 |
| 1 | A7 | myFoot:my_SmallPad_0-8mmDrill | J28 |
| 1 | A8(SCL) | myFoot:my_SmallPad_0-8mmDrill | J48 |
| 1 | A9 | myFoot:my_SmallPad_0-8mmDrill | J29 |
| 1 | ADC | myFoot:my_TestPoint_1.2mm | TP1 |
| 1 | B0 | myFoot:my_SmallPad_0-8mmDrill | J35 |
| 1 | B1 | myFoot:my_SmallPad_0-8mmDrill | J36 |
| 1 | B10 | myFoot:my_SmallPad_0-8mmDrill | J45 |
| 1 | B11 | myFoot:my_SmallPad_0-8mmDrill | J46 |
| 1 | B2 | myFoot:my_SmallPad_0-8mmDrill | J37 |
| 1 | B4 | myFoot:my_SmallPad_0-8mmDrill | J39 |
| 1 | B5 | myFoot:my_SmallPad_0-8mmDrill | J40 |
| 1 | B6 | myFoot:my_SmallPad_0-8mmDrill | J41 |
| 1 | B7 | myFoot:my_SmallPad_0-8mmDrill | J42 |
| 1 | B8 | myFoot:my_SmallPad_0-8mmDrill | J43 |
| 1 | B9 | myFoot:my_SmallPad_0-8mmDrill | J44 |
| 1 | BCK | myFoot:my_TestPoint_1.2mm | TP3 |
| 1 | C0 | myFoot:my_SmallPad_0-8mmDrill | J7 |
| 1 | C1 | myFoot:my_SmallPad_0-8mmDrill | J8 |
| 1 | C10 | myFoot:my_SmallPad_0-8mmDrill | J54 |
| 1 | C11 | myFoot:my_SmallPad_0-8mmDrill | J16 |
| 1 | C12 | myFoot:my_SmallPad_0-8mmDrill | J55 |
| 1 | C2 | myFoot:my_SmallPad_0-8mmDrill | J9 |
| 1 | C3 | myFoot:my_SmallPad_0-8mmDrill | J10 |
| 1 | C4 | myFoot:my_SmallPad_0-8mmDrill | J11 |
| 1 | C5 | myFoot:my_SmallPad_0-8mmDrill | J12 |
| 1 | C6 | myFoot:my_SmallPad_0-8mmDrill | J13 |
| 1 | C7 | myFoot:my_SmallPad_0-8mmDrill | J14 |
| 1 | C9(SDA) | myFoot:my_SmallPad_0-8mmDrill | J5 |
| 1 | D2 | myFoot:my_SmallPad_0-8mmDrill | J6 |
| 1 | DAC | myFoot:my_TestPoint_1.2mm | TP4 |
| 1 | LED | LED_THT:LED_D3.0mm | D1 |
| 1 | LIN | myFoot:my_SmallPad_0-8mmDrill | J1 |
| 1 | LOUT | myFoot:my_SmallPad_0-8mmDrill | J3 |
| 1 | LRCK | myFoot:my_TestPoint_1.2mm | TP2 |
| 1 | NRST | myFoot:my_SmallPad_0-8mmDrill | J53 |
| 1 | RIN | myFoot:my_SmallPad_0-8mmDrill | J2 |
| 1 | ROUT | myFoot:my_SmallPad_0-8mmDrill | J4 |
The 156 most common of 166 parts.
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Questions
How big is the OwmBoard PCB?
It measures 55.4 × 66 mm and has 2 copper layers, 1.6 mm thick.
What parts does the OwmBoard use?
166 parts, built around the OPA1678ID, 78L05, 78L33 and B10. 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 OwmBoard KiCad files?
From the kanengomibako/EffectsPedals repository on GitHub, at the commit this page was made from: the board is OwmPedal/OwmBoard/KiCad/OwmBoard.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the OwmBoard design in my own project?
Its repository publishes it under the Unlicense licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).