MIDI Thru Box Variant 7 Kit with Arduino Uno
MIDI Thru Box Kit with Arduino Uno: Expand Your Synth Rig Without Signal Loss
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Eliminate MIDI daisy-chain hassles with a self-built active splitter that reads one MIDI input and duplicates it cleanly across three outputs. The 6N138 optocoupler-based design provides galvanic isolation, preventing ground loops and ghost notes when you connect multiple hardware synthesizers, drum machines, or sequencers. Assembled on an Arduino Uno, this kit turns a few components into a professional-grade studio tool.
What You'll Build
A compact, low-latency MIDI Thru Box that accepts a standard 5-pin DIN MIDI signal and fans it out to three identical, buffered outputs. Your master keyboard or sequencer can now drive three rack synths or live rigs simultaneously — no signal corruption or timing drift. The enclosure-ready PCB layout and durable DIN sockets mean you can use it on stage night after night.
What You'll Learn
- MIDI protocol fundamentals and how 6N138 optocouplers isolate and pass serial data
- Precision soldering of DIN sockets, resistors, capacitors, and header pins on protoboard
- Reading and forwarding MIDI byte streams using Arduino Uno’s UART
- Designing a reliable 1‑to‑3 signal splitter suitable for demanding audio‑MIDI setups
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| 6N138 MIDI Optocoupler | 3 |
| MIDI DIN Socket | 6 |
| 220Ω Resistors | 10 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 5 |
| PCB Prototype Board | 2 |
| 9V Battery Snap | 1 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Music producers and electronics learners who need a tangible hardware solution for complex MIDI routing. CBSE Class 11–12 students can showcase it in practical exams, B.Tech ECE/EEE undergraduates can use it for signal processing workshops, and Smart India Hackathon teams often integrate MIDI control in robotics or IoT prototypes. ATL Tinkering Labs and music clubs at NIT/VIT/BITS will find it a valuable group build that teaches both coding and hardware integration.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the kit’s QR code to chat with an AI companion that knows every resistor placement. You can also send photos or questions via WhatsApp — our support engineers regularly assist first-time solderers.
Will this work with my Roland/Korg/Yamaha MIDI gear?
Yes, the kit follows the standard MIDI electrical specification. It’s been tested with all common 5-pin DIN instruments from major brands and works with any class‑compliant MIDI controller.
Can I power it with a USB cable instead of the 9V battery?
Absolutely. The Arduino Uno can be powered via its USB port. The 9V battery snap is included for portable setups, but you can omit it if you’ll always have USB power nearby.
Is soldering experience required?
Basic soldering skill is enough. The prototype boards have spacious pads, and the AI companion includes close‑up photos of every joint. If you’ve never soldered, the included soldering iron and wire let you practice while you build.
6N138 optocoupler MIDI input drives three DIN sockets splitting one MIDI input to three outputs.
What's in this kit
- Arduino Uno R3
- 6N138 MIDI Optocoupler x3
- MIDI DIN Socket x6
- 220Ω Resistors x10
- 4.7kΩ Resistors x5
- 100nF Caps x5
- PCB Prototype Board x2
- 9V Battery Snap
- Soldering Iron
- Solder Wire
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items