> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Bluetooth 4.2 Audio Receiver Board-with an Amplifier (2x5W)

**Type:** Product page · **SKU:** DFR0720 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/bluetooth-4-2-audio-receiver-board-with-an-amplifier-2x5w.html ([markdown](https://core-electronics.com.au/bluetooth-4-2-audio-receiver-board-with-an-amplifier-2x5w.html.md))

A small size and cost-effective Bluetooth 4.2 Audio Receiver with dual 5W power amplifier circuits. It can auto-reconnect and can be powered via USB or LiPO…

## Pricing

- **Price:** $6.40 (inc GST) — $5.82 AUD, exc GST
- **Quantity discounts:** 6+ $5.53 (exc GST) · 12+ $5.29 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 81 today, and up to 500 more in 8–12 days.

## How to buy

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## Description

This is a small size and cost-effective Bluetooth 4.2 Audio Receiver module with dual 5W power amplifier circuits. It supports auto-reconnect and can be powered by micro USB or 3.7V lithium battery. The module can be turned into a stereo Bluetooth speaker when connected with two speakers. Also, you can connect the board to a computer via USB to use it as a sound card.

![DFR0720 - Diagram](https://core-electronics.com.au/media/wysiwyg/product_info/dfr0720-diagram.jpg)

### Operating Instruction

After the power is turned on, the blue indicator flashes quickly, and then the module enters the Bluetooth mode; After playing the “Beep”, it goes into the pairing mode, waiting for pairing; Turn on the Bluetooth of a phone, “MH-M38”(module Bluetooth name) will be searched and displayed, click “MH-M38” to connect to the board. It connects successfully with a Beep. When the indicator is always on, you can play your music on the phone, and the indicator keeps slowly blinking when playing music.

### Example setup

**![power up with a computer, car usb, battery bank or wall adapter](https://core-electronics.com.au/media/wysiwyg/product_images/audio-power-inputs.jpg)**

**Note**

1. Since there is no lithium battery protection circuit on the decoder board, it is recommended to use this module with a Lipo Charger board.
2. Pay attention to the electrostatic protection. Since the Bluetooth chip is very sensitive to static electricity, you must discharge the static electricity on your hand to avoid causing damage to the chip when touching it with a bare hand.
3. Bluetooth antenna signal is easy to be influenced by high-frequency or strong electromagnetic signal, so please try to keep the module away from radio transmitting devices, and this board should not be placed close to any metal objects.
 
The module already has dual 5W power amplifier circuits, so please do not connect the external power amplifier with this board. The negative poles of two power amplifier circuits should not be connected together, otherwise, it will destroy the power amplifier chip.

### Specification

- Power Supply: 3.7V-5V ([recommended power supply here](https://core-electronics.com.au/usb-c-power-delivery-battery-bank-10000mah.html))
- Bluetooth Version: 4.2
- Transmission Distance: 15m(Visible)
- Audio Decoding: WAV, APE, FLAC, MP3
- Match Speaker: 2-8Ω, 3-5W (4Ω5W speaker is recommended )
- Dimension: 20\*45mm/0.79\*1.77”
 
### Shipping List

- Bluetooth 4.2 Audio Receiver Board-with an Amplifier (2x5W) x1

## Guides for this product

- [DIY 10W Bluetooth Speaker - No Code Needed – How to use a Bluetooth 4.2 Audio Receiver Board with Onboard Amplifier (MH-M38)](https://core-electronics.com.au/guides/wireless/mh-m38-bluetooth-10w-speaker/)

## Videos for this product

- [DIY USB Boombox with a 4.2 Bluetooth Audio Receiver (MH-M38) - Zero Code!](https://core-electronics.com.au/videos/diy-usb-boombox-with-a-42-bluetooth-audio-receiver-mh-m38-zero-code)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/d/f/dfr0720-1.jpg)