How to Make a Mini Speaker - Super Easy
A small rechargeable speaker build using a PAM8403 amplifier, salvaged speaker, phone battery, and simple enclosure.
This mini speaker is a compact audio project for a phone, laptop, or small desk setup. The PAM8403 amplifier keeps the circuit simple while a phone battery and TP4056 charger make it portable and rechargeable.
Supplies
- PAM8403 audio amplifier module
- Small speaker driver
- Single-cell phone battery
- TP4056 charging module
- 3.5 mm audio jack, switch, LED, wires, and a small container
Step 1: Plan the audio path
The audio jack brings left, right, and ground into the amplifier board. Decide whether you want one speaker channel only or a small visual LED on the unused channel.
Step 2: Solder the amplifier
Connect the audio input to the PAM8403 board, then solder the speaker leads to the amplifier output. Keep the speaker polarity consistent so the cone moves cleanly.
Step 3: Add the rechargeable power source
Solder the battery to the TP4056 charging board, then feed the amplifier through a switch. This keeps the battery rechargeable without needing to open the enclosure every time.
Step 4: Build the enclosure
Mark the speaker opening, cut the container carefully, and secure the speaker, switch, charger board, and wiring with hot glue. Close the enclosure after one final sound test.
Battery note: use a healthy lithium cell, avoid short circuits, and do not charge damaged or swollen batteries.
Original project reference: DiYmon on Instructables.