Difference between revisions of "MIDI-IN-OUT"
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== Drive Circuit == | == Drive Circuit == | ||
| + | |||
| + | * [https://www.mouser.com/ProductDetail/Lite-On/4N25?qs=gnaPJ2cis70RM9udB%2FP83w%3D%3D 4N25 Optocoupler] | ||
| + | * DC Current Transfer Ratio | ||
| + | |||
| + | [[File:4N28-DC-TransferRatio.PNG]] | ||
| + | |||
* Vf(LED) = 1.2V | * Vf(LED) = 1.2V | ||
| − | * R(total) = 220 | + | * R(total) = 220 * 3 = 660 Ohms |
| + | * V(drive) = 5V | ||
| + | * I(LED) = 5.7 mA | ||
| + | * CTR = 50% | ||
Revision as of 11:22, 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
- Vf(LED) = 1.2V
- R(total) = 220 * 3 = 660 Ohms
- V(drive) = 5V
- I(LED) = 5.7 mA
- CTR = 50%
