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

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 Pinout
Function / Model M18 (this item) M28 M38
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 version Bluetooth V4.2
Support Bluetooth protocol HFPV1.7, A2DPV1.2, AVRCPV1.5, AVCTPV1.2, AVDTPV1.2
Format support Support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo two-channel output
Operating Voltage 5V/3.7V-4.2V
Broadcast status not connected 5.5MA
Connection working status 20MA
Deep sleeping 3µA
Transmission distance 20 meters (empty or low interference environment)
Operating temperature  -40 °C to +85 °C
Sensitivity  -87dbm


You might like:

Bom TDA7297 + MH-M18 Bluetooth 4.2 power amplifier circuit

Name Designator Description Quantity
47K (473) R1 0805 1
1k (102) R2 0603 1
10k (103) R3 0805 1
51K (513) R4 0805 1
33K (333) R5 0805 1
9.1K (912) R6 0805 1
1k5 (152) R10,R11 0805 2
9013 Q12 SOT-23-3 – NPN transistor 1
78L05 U6 SOT-89-3 – 5V voltage regulator 1
BT-M18 U7 MH-M18 – Bluetooth module 1
LED-TH-3mm_G LED Led 3 mm Green 1
TDA7297 TDA7297 TDA7297 1
Reverse polarity protection D4 DO-214 – M4 1
1u C11,C18 Film capacitor 2
1u C7 Ceramic capacitor 1
100n C3 0805 1
10u C4 0805 1
10u C9 0805 1
4700u C13,C17 Electrolytic capacitor 2
DG127-5.08-02P-14-02A(H) LOUT,ROUT Connector 2 pin 2
470uh L2 Inductor 1
Play KEY1 Tactile Switch – K2-1107ST-A4DW-06 1
Next/V+ KEY2 Tactile Switch – K2-1107ST-A4DW-06 1
Prev/V- KEY3 Tactile Switch – K2-1107ST-A4DW-06 1
RK097 RP1 Potentiometer 50k 1
3F07 CN1 PJ3F07-5P – 3.5 mm audio connector 1
DC-005A-20A DC Power supply connector 1

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

Download PCB in Gerber, PDF, PNG and SVG




How useful was this post?

Click on a star to rate it!

Average rating 5 / 5. Vote count: 2

No votes so far! Be the first to rate this post.

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

Leave a Comment

Exit mobile version