Puff Main
About the Puff Main PCB
Puff Main is an open source PCB design by Thorinair, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 39.8 × 108.6 mm, with 133 components from 46 distinct parts.
Other key parts include the TL074, LM324, TL072 and 78L05. By type, the board carries 72 resistors, 42 capacitors, 12 ICs, 5 diodes and 1 transistor.
It belongs with the audio designs in this gallery.
From the project
A collection of Avalon Harmonics branded synthesizer modules.
Puff is a stereo multimode filter with a state variable circuit. The filter provides separate Low Pass, Band Pass and High Pass outputs for both channels, has an attenuvertable CV input, a V/OCT input, and a dedicated Ping input. The circuit has some interesting quirks in its design, resulting in some very gritty sounds in higher resonance levels. Note that the filter can't continuously self-oscillate. Features a golden (ENIG coated) panel.
Main components on the Puff Main
Puff Main bill of materials (BOM)
133 components, 46 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | TL074 LM13700 | SO-16_3.9x9.9mm_P1.27mm_AH | U1, U2 |
| 2 | TL074 | SO-14_3.9x8.65mm_P1.27mm_AH | U3, U4 |
| 1 | TL074 TL072 | SO-8_3.9x4.9mm_P1.27mm_AH | U5 |
| 1 | LM324 TL072 | SO-8_3.9x4.9mm_P1.27mm_AH | U6 |
| 5 | TL072 | SO-8_3.9x4.9mm_P1.27mm_AH | U7, U8, U10, U11, U12 |
| 1 | 78L05 TL072 | SO-8_3.9x4.9mm_P1.27mm_AH | U9 |
| 1 | BCM847BS BCM857BS | SOT-363_SC-70-6_Handsoldering | Q1 |
| 1 | PWR_10_Pin | Eurorack Power 10 Pin | PWR1 |
| 2 | 1N4001 FM4001 | D_SOD-123F_AH | D1, D2 |
| 3 | 1N4148W | D_SOD-123F_AH | D3, D4, D5 |
| 2 | 47UF 47uF | CP_Elec_6.3x5.3 | C1, C2 |
| 3 | 10UF 10pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4, C5 |
| 1 | 47PF 10pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C6 |
| 4 | 330pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C7, C8, C9, C10 |
| 1 | 1nF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C11 |
| 1 | 47nF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C12 |
| 25 | 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C13, C14, C15, C16, C17, C18, C24, C25 +17 |
| 4 | 0.1UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C19, C20, C21, C23 |
| 1 | 47PF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C22 |
| 1 | 22 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
Show 26 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 100 22 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2 |
| 1 | 220 22 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | 330 22 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 390 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5 |
| 2 | 2.2K 220 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6, R7 |
| 2 | 2.2K 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8, R9 |
| 2 | 15K 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R10, R13 |
| 2 | 10K 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R11, R12 |
| 1 | 15K 2k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R14 |
| 1 | 15K 5.6k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15 |
| 1 | 15K 11k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R16 |
| 1 | 33K 11k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R17 |
| 2 | 47K 11k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R18, R19 |
| 4 | 47K 15k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R20, R21, R22, R23 |
| 2 | 100K 22k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R24, R25 |
| 1 | 100K 27k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R26 |
| 1 | 120K 27k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R27 |
| 1 | 160K 15k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R28 |
| 1 | 15k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R29 |
| 3 | 47k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R30, R31, R32 |
| 1 | 100K 100k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R33 |
| 1 | 240K 100k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R34 |
| 29 | 100k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R35, R36, R37, R38, R39, R40, R41, R42 +21 |
| 2 | 200k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R64, R65 |
| 6 | 240k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R66, R67, R68, R69, R70, R71 |
| 1 | 1M | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R72 |
Puff Main design files
The KiCad project lives in the Thorinair/Avalon-Harmonics repository on GitHub; these links point at the commit this page was built from.
Puff Main: common questions
How big is the Puff Main PCB?
The Puff Main measures 39.8 × 108.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Puff Main?
133 components, from 46 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Puff Main design files?
From the Thorinair/Avalon-Harmonics repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Puff Main design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which Thorinair chose for the repository.
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