MIDI-IN-OUT

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MIDI-IN-OUT REV1 FRONT 3D.png

Features

  • Module for Prototyping Synthesizer components
  • MIDI In/Out Jacks
  • Opto-isolated MIDI Input
  • 5V MIDI interface
  • 3.3V or 5V Serial connections
  • MIDI In is opto-isolated
  • (2) 4-40 Mounting holes

Connectors

J1 - MIDI In

MIDI IN SCHEMATIC.PNG

  • Opto-isolated input

J2 - MIDI Out

MIDI OUT SCHEMATIC.PNG

J3 - Serial/Power

  • Pinout
  1. V1 (3.3V or 5V
  2. 5V
  3. Receive data (out of card)
  4. Transmit (in to card)
  5. GND

J4 - Short V1 to 5V

  • Short J3-1 to J3-2
  • Used when Host Serial interface is 5V
  • Open when Host Serial interface is 3.3V

Drive Circuit

  • Two options
    • 4N25
    • CNY17-4

4N25 Optocoupler

4N28-DC-TransferRatio.PNG

4N28-CurrentTransferRatio-curve.PNG

  • LED Current vs voltage

4N28-LED-IvsV.PNG

  • Output transistor capacitance

4N28-OutputCapacitance.PNG

  • Switching Time

4N28-SwitchingTime.PNG

Param Val Unit
Vcc (MIDI) 5 V
Vf LED 1.2 V
Res ser 660 Ohms
If LED 5.76 mA
CTR (min) 0.2 A/A
Iout (min) 1.15 mA
Vout 3.3 V
R(min) 2.86 Kohms
Vout 5 V
R(min) 1.75 Kohms

CNY17-4 Optocoupler

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