Difference between revisions of "MIDI-IN-OUT"

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== Drive Circuit ==
 
== Drive Circuit ==
 +
 +
* Two options
 +
** 4N25
 +
** CNY17-4
 +
 +
=== 4N25 Optocoupler ===
  
 
* [https://www.mouser.com/ProductDetail/Lite-On/4N25?qs=gnaPJ2cis70RM9udB%2FP83w%3D%3D 4N25 Optocoupler]
 
* [https://www.mouser.com/ProductDetail/Lite-On/4N25?qs=gnaPJ2cis70RM9udB%2FP83w%3D%3D 4N25 Optocoupler]
Line 60: Line 66:
 
[[File:4N28-SwitchingTime.PNG]]
 
[[File:4N28-SwitchingTime.PNG]]
  
−
* Vf(LED) = 1.2V
+
{| class="wikitable"
−
* R(total) = 220 * 3 = 660 Ohms
+
! Param
−
* V(drive) = 5V
+
! Val
−
* I(LED) = 5.7 mA
+
! Unit
−
* CTR = 50%
+
|-
 +
| 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 ===
 +
 
 +
* [https://www.mouser.com/datasheet/2/427/cny17-1767437.pdf CNY17-Xxx]
 +
 
 +
[[FILE:CNY17-4_CTR.PNG]]
 +
 
 +
[[FILE:CNY17-4_FWD_VOLTS_CURRENT.PNG]]
 +
 
 +
[[FILE:CNY17-4_SWITCHING_CHARACTERISTICS.PNG]]
 +
 
 +
{| class="wikitable"
 +
! Param
 +
! Val
 +
! Unit
 +
|-
 +
| Vcc (MIDI)
 +
| 5
 +
| V
 +
|-
 +
| Vf LED
 +
| 1.39
 +
| V
 +
|-
 +
| Res ser
 +
| 660
 +
| Ohms
 +
|-
 +
| If LED
 +
| 5.46969696969697
 +
| mA
 +
|-
 +
| CTR (min)
 +
| 0.56
 +
| A/A
 +
|-
 +
| Iout (min)
 +
| 3.0630303030303
 +
| mA
 +
|-
 +
| Vout
 +
| 3.3
 +
| V
 +
|-
 +
| R(min)
 +
| 1.07736446379106
 +
| Kohms
 +
|-
 +
| Vout
 +
| 5
 +
| V
 +
|-
 +
| R(min)
 +
| 1.63237039968342
 +
| Kohms
 +
|-
 +
|}
 +
 
 +
* Use 2.2K pullup on Opto output
 +
 
 +
== Assembly Sheet ==
 +
 
 +
[[MIDI-IN-OUT Rev 1 Assembly Sheet]]

Latest revision as of 16:07, 29 September 2022

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

CNY17-4 CTR.PNG

CNY17-4 FWD VOLTS CURRENT.PNG

CNY17-4 SWITCHING CHARACTERISTICS.PNG

Param Val Unit
Vcc (MIDI) 5 V
Vf LED 1.39 V
Res ser 660 Ohms
If LED 5.46969696969697 mA
CTR (min) 0.56 A/A
Iout (min) 3.0630303030303 mA
Vout 3.3 V
R(min) 1.07736446379106 Kohms
Vout 5 V
R(min) 1.63237039968342 Kohms
  • Use 2.2K pullup on Opto output

Assembly Sheet

MIDI-IN-OUT Rev 1 Assembly Sheet

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