Variable Bench Power Supply Kit with Arduino Uno + LED
Build Your Own Digitally-Controlled Bench Power Supply with Arduino
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Power your entire workbench with a custom, digitally-controlled bench supply you build yourself. This kit merges an Arduino Uno, an LM2596 buck converter, and an LM358 op-amp feedback loop to deliver a rock-steady adjustable output from 1.5V to 15V. The INA219 monitors voltage and current in real time, turning a handful of components into a reliable, professional-grade tool that eliminates the guesswork from powering your prototypes.
What You'll Build
A fully functional bench power supply with a crisp OLED display, housed in a sturdy enclosure. Turn the rotary encoder to set your desired voltage with 0.01V precision, watch live voltage and current readings, and safely drive Arduino projects, sensor modules, and experiment boards. The feedback loop keeps output stable even when the load changes, making this a dependable addition to any maker’s lab.
What You'll Learn
- Design an analog feedback loop using an LM358 op-amp to regulate and stabilise buck converter output
- Drive a 12-bit MCP4725 DAC from Arduino to generate precise reference voltages for digital control
- Read real-time voltage and current data from the INA219 sensor over I2C and display it on a 0.96-inch OLED
- Solder through-hole components onto prototyping boards and build a neat front-panel interface with encoder and display
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| LM2596 Buck Converter | 1 |
| LM358 Op-Amp | 1 |
| INA219 | 1 |
| MCP4725 DAC | 1 |
| 0.96in OLED | 1 |
| Rotary Encoder | 1 |
| 100nF Capacitors | 10 |
| PCB Prototype Board | 3 |
| 24V 2A PSU | 1 |
| Enclosure Box | 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
This intermediate kit is a natural fit for CBSE Class 11–12 students building serious electronics practicals, B.Tech ECE and EEE undergraduates who need a compact bench supply for lab sessions, and teams competing in the Smart India Hackathon or setting up ATL Tinkering Labs. University makers at IITs, NITs, VIT, and BITS will also appreciate having a self-built, calibrated instrument they can rely on throughout their coursework.
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?
The AI companion provides interactive troubleshooting for every step. If you still need help, our team is available on WhatsApp to get you unstuck quickly.
Do I need prior soldering experience?
Yes, basic soldering skill is expected since you’ll assemble the feedback circuit on prototyping boards. The included soldering iron and clear diagrams make it manageable even if you’ve soldered only a few joints before.
Can I modify the output range beyond 15V?
The design is optimised for 1.5–15V with a 24V input to keep the LM2596 within safe limits. Pushing beyond 15V risks instability and component stress, so we recommend sticking to the tested range for reliable operation.
Is the enclosure pre-drilled for the display and encoder?
No, you’ll drill openings as part of the build — a template is included in the guide. This adds to the hands-on learning and gives a custom finish to your power supply.
LM2596 + op-amp feedback loop gives adjustable 1.5V to 15V output. INA219 shows voltage and current.
What's in this kit
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