2 layers66.9 × 74.5 mm
2 layers14 × 110 mm
Two tone
bmoren/two-tone422X passive LPG&LPF with DIY vactrols
- Size
- 14 × 110 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 22
- Pads
- 58
- Tracks, vias
- 51, 0
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 7 Jun 2018
- Updated
- 24 Feb 2021
Overview
Two tone is an open-source printed circuit board by bmoren, from the bmoren/two-tone repository on GitHub. It is a 2-layer board of 14 × 110 mm with 20 parts on 22 nets, routed with 51 tracks and 0 vias.
Its parts include 6 connectors, 4 resistors, 4 diodes and 2 capacitors. It belongs with the audio and music boards of this library.
README
readme.mdtwo tone
I wanted to work on building a simple module from start to finish to test out some panel fab ideas and I thought a LPG/LPF would be a good candidate. After listening to Why We Bleep Ep.2 with Abstract Data and talking about the character of imperfection in analog circuits, I thought making a DIY vactrol based board would be interesting! I also thought if there were 2 halves, you could use slightly different components and vary each to make them truly distinct from one another. You can get different characteristics in the filter depending on the size and material of the LPF capacitor and the LDR/LED combo or vactrol used.
Shout out to Look Mum No Computer and Meng Qi for the initial inspiration for this module! Thanks to Josh Mason for the Front Panel Express panel versions.
Panel font by Alice Savoie / CNAP 19 CC BY-ND 4.0
more discussion of this project on llllllll.co
BOM:
| Quantity | Component |
|---|---|
| 2 | Song Huei tall trimmer pots, A10k is prefered (B10k works, but the taper is compressed) |
| 6 | thonkikonn mono jacks |
| 2 | 3mm LED's (White or Blue are best) |
| 2 | Capacitors, 0.1uf - 4.7uf works best. |
| 4 | 6.8k ohm resistors |
| 2 | DIY or NLS-32 vactrol |
How to build a DIY vactrol:
http://guitarpcb.com/PDF%20Files/DIY%20Vactrol.pdf
https://www.youtube.com/watch?v=Je5FS1A7Ys0
https://www.youtube.com/watch?v=Ch9w5JtbZSc
https://www.youtube.com/watch?v=VZ1B0Epr770
The way I usually do it is to take some small heat shrink and heat shrink each leg of the LDR and LED and then hold the LDR and LED together with the light emitting and light sensing parts touching. Cover them in more heat shrink and heat! This way the large heat shrink holds them together while the small heat shrink on each leg prevents shorts.
for each DIY vactrol, I use:
| Quantity | Component |
|---|---|
| 1 | LDR – GL5549 – 45~140(kOhm) |
| 1 | 5mm White LED |
CC-BY-SA-4.0.
Build and use at your own risk! I am not responsible for any damage to self or otherwise that arises from using this project!
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | thonkiconn | modular:PJ301M12_nearness | J1, J2, J3, J4, J5, J6 |
| 4 | 6.8k | Resistors_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R2, R3, R4 |
| 2 | 45k-140k1 | Opto-Devices:Resistor_LDR_5x4.1_RM3 | VAC-PHOTO1, VAC-PHOTO2 |
| 2 | < 4.7u | Capacitors_THT:CP_Radial_D4.0mm_P1.50mm | C1, C2 |
| 2 | A10K | modular:Potentiometer_Alps_RK09K_Horizontal_3d | RV1, RV2 |
| 2 | LED | modular:LED_D3.0mm_center_anchor | D1, D3 |
| 2 | VAC-LED | LEDs:LED_D5.0mm | D2, D4 |
Questions
How big is the Two tone PCB?
It measures 14 × 110 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Two tone use?
20 parts. 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 Two tone KiCad files?
From the bmoren/two-tone repository on GitHub, at the commit this page was made from: the board is rev1_PCB/twotone.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Two tone design in my own project?
Its repository states no licence, so its author keeps all rights: ask bmoren before reusing the design.
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