2 layers71.1 × 103.5 mm
Ob SX Interface
VoltMusic/OB-SX-Programmer-and-Interface
This contains the Arduino code and KiCAD project file for creating a OB-SX Programmer and Interface.
43 parts
2 layers499.7 × 124.5 mm
Controller
VoltMusic/OB-SX-Programmer-and-InterfaceThis contains the Arduino code and KiCAD project file for creating a OB-SX Programmer and Interface.
- Size
- 499.7 × 124.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 157
- Nets
- 134
- Pads
- 689
- Tracks, vias
- 1,953, 240
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 2 Jan 2022
- Updated
- 1 Feb 2022
Overview
Controller is an open-source printed circuit board by VoltMusic, from the VoltMusic/OB-SX-Programmer-and-Interface repository on GitHub. It is a 2-layer board of 499.7 × 124.5 mm with 157 parts on 134 nets, routed with 1,953 tracks and 240 vias.
It is built around the ATMEGA328-AU, HT16K33 and AMS1117-3.3, with the AMS1117-5.0 and L7805 among its other parts. Its parts include 38 capacitors, 28 diodes, 28 switches, 24 resistors and 10 connectors. It belongs with the interfaces and adapters boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
5
ATMEGA328-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
HT16K33
SOP-28-300mil-40℃~+85℃ 4.5V~5.5V PWM SOP-28-300mil LED Drivers ROHSHoltek SemiconLED Drivers
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsAMS1117-5.0
SOT-223-40℃~+125℃ 1 1.3V 15V 1A 5V 60dB Fixed Positive Short Circuit Protection、Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdOB-SX-Programmer-and-Interface
This contains the Arduino code and KiCAD project file for creating a OB-SX Programmer and Interface.
The Interface plugs into the D-sub connector at the back of the OB-SX. It accesses the OB-XA's RAM and overwrites data linked to the voice board parameters. The Programmer allows the user to program each parameter of the voices by sending messages to the Interface over a IC2 bus.
The RAM layout file shows how the parameters, key and gate signals are stored in RAM memory (can't promise this is %100 correct). Thank you to Prehistoricman for helping reverse-engineer the ROM of the OB-SX to find these relevant address locations.
I may re-visit this project again but design the board around the more powerfull teensy microcontroller. I had many issues with the slowness and memory leakage of the arduino.
Problems:
- And extra diode is required on the programmer board, I will update the PCB with this correction soon
- As you can see in the interface code the MIDI part is commented out, this is because it has many issues currently.
To-do:
- Upload example SD card patch files
Disclaimer:
- By using the code and PCB design files included in this repository, you take responsibility of any damage that may occur to your OB-SX. I highly recommend using these materials as a starting point for you to add and improve upon, if you do not have a good understanding of electronics and (Arduino) programming I do not recommend this project. These designs are open-source and therefore can be used as you wish.
Thank you
- Nile (Volter, VoltMusic)
Parts
157| Qty | Value | Footprint | References |
|---|---|---|---|
| 36 | CAP | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C10, C11, C12, C13, C14, C17, C18, C19, C20, C21, C22, C23, C24, C25 +20 |
| 27 | D | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +11 |
| 27 | SW_Push_LED | Custom_Footprints:Synth_Button | SW1, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23, SW24 +11 |
| 24 | R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +8 |
| 19 | R_POT | Custom_Footprints:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1, RV2, RV4, RV5, RV6, RV10, RV11, RV12, RV13, RV14, RV15, RV16, RV17, RV18, RV19, RV20 +3 |
| 3 | 4051 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U2, U3, U4 |
| 2 | AudioJack3 | Custom_Footprints:Audio_Jack_3_Pin | J1, J2 |
| 2 | CP | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C15, C16 |
| 2 | Conn_01x06_Female | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3, J7 |
| 1 | 74126 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U5 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U6 |
| 1 | AMS1117-5.0 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U7 |
| 1 | ATmega328-AU | Package_QFP:TQFP-32_7x7mm_P0.8mm | U1 |
| 1 | AudioJack2 | Custom_Footprints:Audio_Jack_3_Pin | J4 |
| 1 | Barrel_Jack_Switch | Custom_Footprints:CUI_PJ-002A | J10 |
| 1 | Conn_01x04_Male | Custom_Footprints:PJ320D_3.5mm_Jack | J5 |
| 1 | Conn_01x07_Female | Custom_Footprints:1.3Inch_OLED_SPI | J11 |
| 1 | Crystal | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | D | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D28 |
| 1 | HT16K33 | Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm | J8 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U8 |
| 1 | Micro_SD_Card | Custom_Footprints:Conn_uSDcard | J9 |
| 1 | SW_MEC_5E | Button_Switch_THT:SW_TH_Tactile_Omron_B3F-10xx | SW2 |
| 1 | SolderJumper_3_Open | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
Questions
How big is the Controller PCB?
It measures 499.7 × 124.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Controller use?
157 parts, built around the ATMEGA328-AU, HT16K33, AMS1117-3.3 and AMS1117-5.0. 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 Controller KiCad files?
From the VoltMusic/OB-SX-Programmer-and-Interface repository on GitHub, at the commit this page was made from: the board is KiCAD Design Files/OB-SX Programmer/Controller.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Controller design in my own project?
Its repository states no licence, so its author keeps all rights: ask VoltMusic before reusing the design.
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