BufferVariator RevB
kanengomibako·EffectsPedals·BufferVariator/BufferVariator_RevB.kicad_pcb
About the BufferVariator RevB PCB
BufferVariator RevB is an open source PCB design by kanengomibako, published on GitHub under the Unlicense license. It is a 2-layer board measuring 100 × 100 mm, with 100 components from 44 distinct parts.
Other key parts include the OPA1678, MX25947ES and NE555DR. By type, the board carries 45 capacitors, 41 resistors, 3 ICs, 3 connectors, 3 switches and 3 diodes.
From the project
ギター・ベースのピックアップで拾った音は、楽器本体のボリューム・トーンやシールドケーブル、最初に接続する機器の入力部により独特な音質変化が起こります。本機は、入力部の抵抗値と静電容量値を変化させることにより、主に高音域の音質変化をコントロールできるようにしたバッファー/ブースターです。
ギター・ベースのピックアップで拾った音は、楽器本体のボリューム・トーンやシールドケーブル、最初に接続する機器の入力部により独特な音質変化が起こります。本機は、入力部の抵抗値と静電容量値を変化させることにより、主に高音域の音質変化をコントロールできるようにしたバッファー/ブースターです。
パッシブタイプのギターやベースを接続します。フルアップボリュームポットやフルアップトーンポットが搭載されていると、より効果的です。アクティブタイプの楽器や別のバッファーを介して接続した場合、音色変化がほとんどなく、GAINのみ変化します。
ACアダプターなどの電源を接続します。電源には、DC9V(センターマイナス)出力で、100mA以上の電流出力が可能なものを使用してください。
エフェクトオン/オフを切り替えます。エフェクトオフ時は、一般的なバッファー(RESISTANCE:1MΩ CAPACITANCE:OFF GAIN:±0dB)となります。

Main components on the BufferVariator RevB
BufferVariator RevB bill of materials (BOM)
100 components, 44 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | OPA1678 | SOIC-8_3.9x4.9mm_P1.27mm_rotate | U1 |
| 1 | MX25947ES | SOIC-8-1EP_3.9x4.9mm_rotate | U2 |
| 1 | NE555DR | SOIC-8_3.9x4.9mm_P1.27mm_rotate | U3 |
| 1 | IN | PJ-611E_HOOYA | J1 |
| 1 | OUT | PJ-611E_HOOYA | J2 |
| 1 | DC_IN | my_DC_Jack | J3 |
| 1 | 3PDT | my_sw_3pdt | SW1 |
| 1 | Rotary_SW_R | RotarySW_Alpha_26mm_wide_pad | SW2 |
| 1 | Rotary_SW_C | RotarySW_Alpha_26mm_wide_pad | SW3 |
| 1 | B10k | my_Pot_RD901F-40 | VR1 |
| 1 | BR_LED | my_LED_3mm_RG | LED1 |
| 1 | SM4007 | D_SOD-123F | D1 |
| 2 | B5819W | D_SOD-123F | D2, D3 |
| 2 | 10u | C_1812_4532Metric_THT_P2.0 | C1, C2 |
| 11 | 2.2n | C_0805_2012Metric | C3, C4, C5, C6, C7, C13, C14, C15 +3 |
| 10 | 100p | C_0603_1608Metric | C8, C9, C10, C11, C12, C30, C31, C32 +2 |
| 8 | 330p | C_0603_1608Metric | C18, C21, C22, C23, C24, C26, C28, C29 |
| 1 | 68p | C_0603_1608Metric | C20 |
| 1 | 10p | C_0603_1608Metric | C25 |
| 4 | 20p | C_0603_1608Metric | C27, C33, C35, C36 |
Show 24 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 100n | C_0603_1608Metric | C37, C39, C41, C45 |
| 2 | 220u | my_C_D6.3mm_P2.50mm | C38, C44 |
| 2 | 1u | C_1206_3216Metric | C42, C43 |
| 4 | 10k | R_0603_1608Metric | R1, R32, R37, R41 |
| 2 | 30k | R_0603_1608Metric | R2, R3 |
| 2 | 1k | R_0603_1608Metric | R4, R21 |
| 4 | 100k | R_0603_1608Metric | R5, R17, R20, R40 |
| 1 | 10M | R_0603_1608Metric | R6 |
| 2 | 1M | R_0603_1608Metric | R7, R11 |
| 2 | 1.5M | R_0603_1608Metric | R8, R12 |
| 2 | 120k | R_0603_1608Metric | R9, R10 |
| 1 | 470k | R_0603_1608Metric | R13 |
| 3 | 56k | R_0603_1608Metric | R14, R16, R19 |
| 1 | 200k | R_0603_1608Metric | R15 |
| 3 | 22k | R_0603_1608Metric | R18, R28, R35 |
| 1 | 68k | R_0603_1608Metric | R22 |
| 1 | 7.5k | R_0603_1608Metric | R23 |
| 2 | 47k | R_0603_1608Metric | R24, R38 |
| 1 | 3.3k | R_0603_1608Metric | R25 |
| 2 | 33k | R_0603_1608Metric | R26, R36 |
| 2 | 100R | R_0603_1608Metric | R27, R39 |
| 3 | 10R | R_0603_1608Metric | R29, R31, R33 |
| 1 | 15k | R_0603_1608Metric | R30 |
| 1 | 220k | R_0603_1608Metric | R34 |
BufferVariator RevB design files
The KiCad project lives in the kanengomibako/EffectsPedals repository on GitHub; these links point at the commit this page was built from.
BufferVariator RevB: common questions
How big is the BufferVariator RevB PCB?
The BufferVariator RevB measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the BufferVariator RevB?
100 components, from 44 distinct parts. The full bill of materials is listed on this page.
Where can I download the BufferVariator RevB design files?
From the kanengomibako/EffectsPedals repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the BufferVariator RevB design in my own project?
Yes, under the terms of its Unlicense license, which kanengomibako chose for the repository.
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