Difference between revisions of "MIDI-IN-OUT"
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| − | * Use 3.3K | + | * Use 3.3K pull-up on Opto output |
Revision as of 13:59, 29 September 2022
Contents
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
- Opto-isolated input
J2 - MIDI Out
J3 - Serial/Power
- Pinout
- V1 (3.3V or 5V
- 5V
- Receive data (out of card)
- Transmit (in to card)
- 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
- 4N25 Optocoupler
- DC Current Transfer Ratio
- LED Current vs voltage
- Output transistor capacitance
- Switching Time
| Vcc | 5.00 | V |
|---|---|---|
| Vf LED | 1.20 | V |
| Res ser | 660.00 | Ohms |
| If LED | 5.76 | mA |
| CTR (min) | 0.20 | A/A |
| Iout | 1.15 | mA |
| Vout | 3.30 | V |
| R(min) | 2.86 | Kohms |
| Vout | 5.00 | V |
| R(min) | 1.75 | Kohms |
- Use 3.3K pull-up on Opto output
