2 layers40.6 × 110 mm
Europi surface mount
Allen-Synthesis/EuroPi
EuroPi: A reprogrammable Eurorack module based on the Raspberry Pi Pico
92 parts584CC0-1.0
2 layers545 × 200 mm
Alpha.ctrl
banjomasterpete/alpha.ctrl7An open source Sysex controller for the Roland Alpha Juno
- Size
- 545 × 200 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 114
- Nets
- 116
- Pads
- 499
- Tracks, vias
- 928, 13
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 19 Jul 2024
- Updated
- 4 Aug 2024
Overview
Alpha.ctrl is an open-source printed circuit board by banjomasterpete, from the banjomasterpete/alpha.ctrl repository on GitHub, published under the MIT licence. It is a 2-layer board of 545 × 200 mm with 114 parts on 116 nets, routed with 928 tracks and 13 vias.
It is built around the L7805. Its parts include 42 resistors, 19 capacitors, 7 ICs, 2 diodes and 2 switches. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdalpha.ctrl
An open source Sysex controller for the Roland Alpha Juno
The Alpha Juno is a classic synthesizer with patches ranging from lush pads to the ‘Hoover’, but it’s also annoying to program. All parameter changes are done using 2 membrane keys and the alpha dial, this is adequate for making small changes but building patches from scratch can turn to agony. If it was the 80’s, the Alpha Juno could have been purchased with the optional programmer, the PG-300. This controller was specifically built for the Alpha 1 and 2 and restored the individual parameter change functions of previous Junos. In the 2020’s however, the PG-300s are often going for twice the price of the Juno, if you can even find one! There are other options available in software applications, custom MIDI controller layouts, and a few third party controllers. I’ve found the third party controllers to be unavailable or nearly as expensive as the originals, so this led me to design my own instead.
The alpha.ctrl can be built inexpensively, and its open source design makes it further modifiable by each user. I really encourage anyone to make modifications to it, I’m sure there are further optimizations to make than I could find.
Parts
114| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | 100k | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | RV1, RV2, RV10, RV11, RV12, RV13, RV14, RV15, RV16, RV17, RV18, RV19, RV20, RV21, RV22, RV23 +9 |
| 24 | 33k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25 +8 |
| 17 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C3, C4, C5, C6, C7, C8, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19 +1 |
| 10 | 20k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R27, R28, R29, R30, R31, R32, R33, R34, R35, R36 |
| 10 | ~ | RotarySwitch:Switch_Rotary 8POS | T1, T2, T3, T4, T5, T6, T7, T8, T9, T10 |
| 5 | 4051 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U1, U2, U3, U4, U5 |
| 4 | 220R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R37, R38, R39, R40 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 2 | 10u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C1, C2 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R41, R42 |
| 2 | ~ | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | PROG1, PWRSW1 |
| 2 | ~ | SynthParts:JunoButtons | SW1, SW2 |
| 2 | ~ | SynthParts:MIDI | MIDI_IN1, MIDI_OUT1 |
| 1 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
| 1 | 1N914 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | 6N138 | Package_DIP:DIP-8_W7.62mm_LongPads | U6 |
| 1 | Arduino_Nano_Socket | arduino-library:Arduino_Nano_Socket | A1 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U7 |
| 1 | LOGO | LOGO | G*** |
| 1 | PWR | Connector_BarrelJack:BarrelJack_Horizontal | J1 |
Questions
How big is the Alpha.ctrl PCB?
It measures 545 × 200 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Alpha.ctrl use?
114 parts, built around the L7805. 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 Alpha.ctrl KiCad files?
From the banjomasterpete/alpha.ctrl repository on GitHub, at the commit this page was made from: the board is pcb files/AlphaCtrl.kicad_pcb and its schematic pcb files/AlphaCtrl.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Alpha.ctrl design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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