How to Build a Tiny Low-Power Voice Recorder with Common Parts


Building your own low-power voice recorder from common electronic parts is a fun and educational project. With just a few inexpensive components, you can assemble a device that will let you capture audio in a compact package.

In this guide, I will walk you through step-by-step instructions on how to build a simple yet functional voice recorder using commonly available parts. We will cover:

What You Will Need

How It Works


Let's get started!

Step 1: Gather the Required Electronic Components

To build the voice recorder, you will need the following main components:

For the best experience, I recommend getting a beginner electronics component kit that includes all the above items. That way you will have all the necessary parts in one purchase.

Step 2: Prepare the Enclosure

The enclosure I chose for this build is an Altoids small mint tin. This provides a compact, rugged and low cost housing for the voice recorder circuit.

To prepare the enclosure, follow these steps:

The enclosure is now ready to install the electronics in.

Step 3: Connect the Microcontroller and Micro SD Card Module

The first components to wire up are the Arduino Nano and the Micro SD card module.

Follow these steps:

The essential digital voice recording components are now connected!

Step 4: Add the Microphone and Amplifier

Now we need to add the analog audio input circuit using a microphone and amplifier module:

At this point your device should be able to record voices clearly!

Step 5: Power it with a Battery Pack

To make the voice recorder fully portable, we need to power it with batteries instead of USB:

Now your voice recorder can run untethered!

Step 6: Final Assembly and Usage

We're in the home stretch! Follow these final steps to complete the build:

To use your new voice recorder:

And that's it! You now have a tiny, battery-powered voice recorder you can build for under $30. Enjoy putting it to use for memos, lectures, music and more!


In this guide, I covered the full process of assembling a miniature voice recorder using simple electronic components:

Building your own electronics like this voice recorder is tremendously fun and educational. I hope you're able to use this guide to create your own compact audio recording device. Happy building!