Speaker 3W

Pinout — Speaker 3W

Wiring notes

A passive speaker MUST be driven by an audio amplifier (e.g. PAM8403, MAX98357A, LM386). NEVER connect directly to a DAC line-out or microcontroller pin — the signal is too weak and may damage the source. Connect amplifier output (+/-) to speaker (+/-).

Example wiring diagram — Speaker 3W

Example Arduino code — Speaker 3W

This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.

// NOTE: A passive 3W speaker must be driven by an audio amplifier.
// This minimal sketch is included for documentation purposes, but do NOT connect
// a passive speaker directly to an Arduino pin in real hardware.

const int speakerPin = 9;

void setup() {
  pinMode(speakerPin, OUTPUT);
}

void loop() {
  tone(speakerPin, 440);
  delay(500);
  noTone(speakerPin);
  delay(500);
}

Related components

4-Channel Optoisolator Board

AD9850 DDS Signal Generator Module

Adjustable Step-down Module 3-40VDC 1.5-35VDC LM2596

Breadboard 400 pin