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Amiga Serial Midi Adapter V1.3
Schematic
(C)2025 Retronic Design - Open Hardware
Features
- This serial midi interface is compatible with most Amiga Midi softwares.
- It simply convert serial RS-232 RX and TX signals to MIDI TTL standard.
- MIDI IN is opto-isolated to prevent ground loops and induction noise.
- Self powered via serial port.
- Convenient thru connector to connect other instruments to MIDI IN in daisy-chain.
- Tested on Bar and Pipes professional and OCTA-MED. (Let us know yours!)
Versions
- v1.0 Initial release
- v1.1 Corrected LED polarity
- v1.2 Corrected DB-25 PCB footprint
- v1.3 Corrected Schematic and PCB (Larger traces / LED alignement / Smaller but capable 5v regulator)
PCB
Pictures
*Please note that this picture is an outdated version 1.0 of the serial Midi adapter.
You can have it build at PCBWay under my shared projects.
Part List
| Quantity | Designator | Part |
|---|---|---|
| 1 | C1 | 100pF |
| 6 | C2,C3,C4,C5,C6,C7 | 0.1uF |
| 1 | D1 | 1N4148 |
| 2 | D2,D3 | LED |
| 3 | J1,J2,J3 | DIN 5 FEMALE |
| 1 | J4 | D-SUB 25 Female |
| 5 | R1,R2,R3,R4,R5 | 220 Ohms |
| 2 | R6,R8 | 1K |
| 1 | R7 | 3.3K |
| 1 | U1 | 6N136 |
| 1 | U2 | MAX232 |
| 1 | U3 | L4931-5.0 |