Compact TDA7297 + MH-M18 Bluetooth 4.2 Power Amplifier Circuit for Audio Applications

TDA7297 + mh-M18 Bluetooth 4.2 power amplifier circuit

TDA7297 with Bluetooth power amplifier circuit using Bluetooth module MH-M18, for smartphone a pc application. With power supply for the Bluetooth module using a 78l05 SMD voltage regulator and a filter with inductor and capacitor.

The TDA7297 integrated amplifier. The circuit uses two large filters, with a 78L05 voltage regulator providing 5V power to the Bluetooth module. The 5V power supply uses CLC filtering to ensure a purer power supply. The signal input does not have an equalization circuit.

Schematic TDA7297 + MH-M18 Bluetooth 4.2 power amplifier circuit

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About ic tda7297 15 W + 15 W dual bridge amplifier

The IC TDA7297 is a dual bridge amplifier integrated circuit used in audio amplification applications. It is designed to deliver high-quality audio output with a power rating of up to 15 watts per channel. The TDA7297 is known for its low distortion and high signal-to-noise ratio, making it ideal for audio systems requiring clear and powerful sound reproduction. This IC features a built-in thermal shutdown and short-circuit protection, ensuring safe operation even under demanding conditions. Its compact size and ease of use make it popular for various audio applications, including portable speakers, car audio systems, and home theater setups. Overall, the IC TDA7297 offers excellent audio performance, reliability, and versatility, making it a preferred choice among audio enthusiasts and professionals.

About Bluetooth module MH-M18

The Bluetooth module MH-M18 is a highly versatile and reliable device that allows for wireless communication between various electronic devices. This module operates on Bluetooth version 5.0, providing a stable and efficient connection with a range of up to 10 meters. With its compact size and easy-to-use interface, the MH-M18 module integrates seamlessly with a wide range of applications, from home automation systems and wireless speakers to automotive electronics and wearable devices. It supports both classic Bluetooth and BLE (Bluetooth Low Energy) modes, offering flexibility for different connectivity requirements. The MH-M18 module also features a built-in antenna, which ensures a strong and stable signal transmission, and it can be easily powered with a supply voltage between 3.3V and 5V, making it compatible with various power sources. Overall, the Bluetooth module MH-M18 is an excellent choice for anyone looking to incorporate wireless connectivity into their electronic projects.

Mh-M18 Bluetooth 4.2 Nodule
Mh-M18 Bluetooth 4.2 Nodule Mh-M18 Pinout
Function / ModelM18 (this item)M28M38
Micropower supply×
Audio headphone jack××
Built-in amplifier××√(5W+5W)
Lithium battery powered
Support USB sound card, free drive××
Volume memory/adjustment××
MUTE interface××
Button extension××
Bluetooth versionBluetooth V4.2
Support Bluetooth protocolHFPV1.7, A2DPV1.2, AVRCPV1.5, AVCTPV1.2, AVDTPV1.2
Format supportSupport WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo two-channel output
Operating Voltage5V/3.7V-4.2V
Broadcast status not connected5.5MA
Connection working status20MA
Deep sleeping3µA
Transmission distance20 meters (empty or low interference environment)
Operating temperature -40 °C to +85 °C
Sensitivity -87dbm


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Bom TDA7297 + MH-M18 Bluetooth 4.2 power amplifier circuit

47K (473)R108051
1k (102)R206031
10k (103)R308051
51K (513)R408051
33K (333)R508051
9.1K (912)R608051
1k5 (152)R10,R1108052
9013Q12SOT-23-3 – NPN transistor1
78L05U6SOT-89-3 – 5V voltage regulator1
BT-M18U7MH-M18 – Bluetooth module1
LED-TH-3mm_GLEDLed 3 mm Green1
Reverse polarity protectionD4DO-214 – M41
1uC11,C18Film capacitor2
1uC7Ceramic capacitor1
4700uC13,C17Electrolytic capacitor2
DG127-5.08-02P-14-02A(H)LOUT,ROUTConnector 2 pin2
PlayKEY1Tactile Switch – K2-1107ST-A4DW-061
Next/V+KEY2Tactile Switch – K2-1107ST-A4DW-061
Prev/V-KEY3Tactile Switch – K2-1107ST-A4DW-061
RK097RP1Potentiometer 50k1
3F07CN1PJ3F07-5P – 3.5 mm audio connector1
DC-005A-20ADCPower supply connector1

Download files, links, and notes for TDA7297 + MH-M18 Bluetooth 4.2 power amplifier circuit

Download PCB in Gerber, PDF, PNG and SVG




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About the author blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.

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