2 layers180 × 110 mm
ISD1700 sampler main board
hiro-akihabara/OpnBeat
OpnBeat is open source Lo-fi sampler project
180 parts67GPL-3.0
2 layers100 × 50 mm
Rc2014-ym2151
electrified/rc2014-ym21519Yamaha's DX21, DX27 and DX100 synthesisers used a derivative IC which is very similar.
- Size
- 100 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 69
- Pads
- 192
- Tracks, vias
- 371, 13
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Oct 2021
- Updated
- 17 Aug 2026
Overview
Rc2014-ym2151 is an open-source printed circuit board by electrified, from the electrified/rc2014-ym2151 repository on GitHub. It is a 2-layer board of 100 × 50 mm with 33 parts on 69 nets, routed with 371 tracks and 13 vias.
It is built around the NJM4556AM, 74HCT688D and SJ1-3523N. Its parts include 12 capacitors, 5 ICs, 3 connectors, 1 resistor and 1 crystal. It belongs with the retro computing and games boards of this library.
Main components
3NJM4556AM
DMP-8-40℃~+85℃ 2 2V~18V 3V/us 500nA 5nA 6mV 70mA 8MHz 90dB DMP-8 Operational Amplifier ROHSNisshinbo Micro Devices Inc.Operational Amplifier
74HCT688D
SOIC-20-300milSOIC-20-300mil Specialty Logic ROHSPhilips SemiconsSpecialty Logic
SJ1-3523N
插件,12x11mm-25℃~+85℃ 12V 12mm 14.3mm 1A 3.5mm Headphone Jack 5mm Black Brass、Stainless steel Right-Angle Silver TRS Plugin,12x11mm Audio Connectors ROHSCUIAudio Connectors
README
README.mdOPM Tone Generator (AKA YM2151 Sound card) for RC2014/RC40 bus computers
The board
RC40 bus OPM FM Sound card.
Features
- FM Operator Type M (OPM)
- 4 operators
- 8 algorithms
- 8 notes
- Stereo output
History
The YM2151 tone generator and accompanying YM3012 stereo DAC have been used in several computer systems. Most notably the Sharp X68000 and Yamaha's CX5M MSX computer, along with a number of arcade boards. More recently the retro inspired Commander X16 currently has one in it's design.
Yamaha's DX21, DX27 and DX100 synthesisers used a derivative IC which is very similar.
What music files can be played back?
- YM2151 VGM files (using vgmplayer)
- Sharp X68000 MDX files (using mdxplay https://github.com/electrified/mdxplay-rc2014)
Bill Of Materials
Download the latest Documentation zip from the releases section. This contains a HTML iBOM in the BOM folder.
Gerbers
Download the latest JLCPCB zip from the releases section. This contains standard Gerbers.
Sources / attribution
Beep program modified from https://commander-cx16.fandom.com/wiki/Beep
vgmplayer modified from Marco's version at https://groups.google.com/g/rc2014-z80/c/9nHnETJzGKU/m/z1A33J_GBAAJ, in turn modified from jblang's version at https://github.com/jblang/SN76489/blob/master/examples/vgmplayer.asm
KiCad Github actions https://github.com/INTI-CMNB/kibot https://github.com/neilenns/KiBot-CICD-Template https://github.com/neilenns/CJ4-Electrical-Panel
Background reading/ viewing
https://ayce.dev/emptyx16.html#9f41h---ym2151-register-data-w--status-r
https://ayce.dev/emptyx16.html#ym2151-fm-operator-type-m-opm
https://www.youtube.com/watch?v=BG6q53p7Z10
https://www.youtube.com/watch?v=GnbT23wGcIA
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 0.1uF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2, C3, C4, C6, C12 |
| 2 | 1500pF / 3300pF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C8, C9 |
| 2 | 4.7uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C10, C11 |
| 2 | NJM4556 | Package_DIP:DIP-8_W7.62mm_Socket | U4, U5 |
| 1 | 100 / 270 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | 10K | Resistor_THT:R_Array_SIP8 | RN1 |
| 1 | 10uF / Omit? | Capacitor_THT:C_Radial_D4.0mm_H7.0mm_P1.50mm | C7 |
| 1 | 3.579545MHz | Package_DIP:DIP-8_W7.62mm_Socket | X1 |
| 1 | 4.7uF | Capacitor_THT:CP_Radial_D7.5mm_P2.50mm | C5 |
| 1 | 74HCT688 | Package_DIP:DIP-20_W7.62mm_Socket | U1 |
| 1 | BASE ADDRESS | Connector_PinHeader_2.54mm:PinHeader_2x07_P2.54mm_Vertical | JP1 |
| 1 | Debug connector | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | LOGO | local:tone_generator | G*** |
| 1 | LOGO | local:fmsynth | G*** |
| 1 | LOGO | local:envelope_text | G*** |
| 1 | LOGO | local:opm | G1 |
| 1 | LOGO | LOGO | G*** |
| 1 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1 |
| 1 | OSHW-Logo_11.4x12mm_SilkScreen | Symbol:OSHW-Logo_11.4x12mm_SilkScreen | G3 |
| 1 | Opamp + to 5V | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP3 |
| 1 | Opamp - to GND | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP2 |
| 1 | RC2014 BUS | electrified:PinHeader_1x39_P2.54mm_Vertical | P1 |
| 1 | SJ1-3523N | electrified:Headphone_Jack_3.5mm_5_pin | CON1 |
| 1 | YM2151 | Package_DIP:DIP-24_W15.24mm | U2 |
| 1 | YM3012 | Package_DIP:DIP-16_W7.62mm | U3 |
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Questions
How big is the Rc2014-ym2151 PCB?
It measures 100 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Rc2014-ym2151 use?
33 parts, built around the NJM4556AM, 74HCT688D and SJ1-3523N. 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 Rc2014-ym2151 KiCad files?
From the electrified/rc2014-ym2151 repository on GitHub, at the commit this page was made from: the board is rc2014-ym2151.kicad_pcb and its schematic rc2014-ym2151.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Rc2014-ym2151 design in my own project?
Its repository states no licence, so its author keeps all rights: ask electrified before reusing the design.