TPA3116 + MH-M18 class D audio amplifier with Bluetooth

TPA3116 + MH-M18 class d audio amplifier with Bluetooth

The TPA3116 + MH-M18 Class D audio amplifier is a powerful and efficient audio amplifier that utilizes the TPA3116 chip. This Class D amplifier is designed to provide high output power while maintaining a compact size. With its high efficiency, it can deliver excellent audio quality while minimizing power consumption. The inclusion of Bluetooth connectivity allows for easy wireless audio streaming, adding convenience to the amplifier’s functionality. Overall, the TPA3116 + MH-M18 Class D audio amplifier is a reliable and versatile option for those looking to enhance their audio experience with powerful and high-quality sound output.

Schematic TPA3116 + MH-M18 class D audio amplifier with Bluetooth

Schematic Tpa3116 + Mh-M18 Class D Audio Amplifier With Bluetooth
Schematic

 

 

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There are some problems with the heat sink that are worth noting it down:

The heat sink on the picture is a 25×25 mm aluminum heat sink. It has good thermal performance (temperature never exceeds 50° on full power), but the size of the heat sink is a little too big. To solve this problem, I pushed two inductors in the middle a little backward to fit the heat sink in. Another alternative solution is to use a 20×25 mm heat sink, which can fit perfectly, and it works fine when the output is below 40W. 40W output can be pretty loud for indoor use, and I would recommend using the alternative solution when it comes to the choice of heat sink.

Tpa3116 + Mh-M18 Class D Audio Amplifier With Bluetooth Versions

Design specification:

  • Class D amplifier using TPA3116 IC
  • 50W output (4 Ω load) with 24V DC input power
  • Adjustable gain and oscillation frequency Gain from 0-40dB
  • 400kHz, 500kHz, 1000kHz and 1200kHz adjustable oscillation frequency
  • Small and compact design (62×55 mm)
  • Bluetooth and auxiliary (3.5 mm) input available

Gain and oscillation frequency adjustment:

Gain can be adjusted by turning the potentiometer R3, the reference table is shown below:

R3(Ω)5.6k20k39k
R5 (Ω)NC100k100k
Gain (dB)202632

The frequency adjustment is done by adjusting the connection on AM0, AM1 and AM2. Normally, there is nothing connected to these slot, which will give 400kHz of oscillation frequency. The frequency adjustment is shown on the table below (1=connected with 0 Ω resistor, 0=NC)

AM10001
AM20010
AM30100
Frequency (kHz)40050010001200

 

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BOM TPA3116D2 + MH-M18 class D audio amplifier with Bluetooth

NameDesignatorDescriptionQuantity
Resistors
0RAM0,AM1,AM2,JP4,JP706035
100KR1,R2,R5,R7,R8,R9,R10,R11,R1206039
100K (104)R3CT-94EW 100K — Trimpot1
20KR4,R606032
3.3R (3R3)R13,R14,R15,R1612064
10K (103)R1706031
4.7KR1806031
50K (503)RW1RK097 Double potentiometer1
Capacitors
0.1uC1,C2,C3,C4,C8,C11,C30,C3206038
1uC5,C6,C13,C14,C15,C16,C17,C18,C19,C20,C29060311
1nFC7,C1206032
2200uF/35VC9,C10Electrolytic capacitor2
1uC21,C22,C23,C24,C25,C26,C27,C2812068
4.7pfC3106031
Semiconductors
ORH-G36GLED1LED 0603 Green1
MMBT2222AQ140V 300mW 600mA NPN SOT-23-3 Bipolar Transistor1
MH-M18H1Bluetooth Module MH M181
TPA3116D2DADRU1*50Wx2@4 Ω D — HTSSOP-32-6.1 mm Audio Power OpAmps1
LM7805U2TO-220-3 — 5V Voltage Regulator1
Miscellaneous
10uH (100)L1,L2,L3,L410uH SMD,12×12 mm Power Inductor >= 4A4
100uH (101)L5L06031
Right SpeakerSPK11×2P 5.08 mm Screw terminal1
Left SpeakerSPK21×2P 5.08 mm Screw terminal1
3.5 mm AudioCN1PJ-3270-4A — 3.5 mm headphone jack1
DC-005A-20ADC1DC-005A-20A — Right-Angle DC Power Receptacle1
PZ254V-11-01PFALTZ, GND, SYNC2.54 mm Pin Header3
TS-1101-C-WSW1TS-1101-C-W — Brick nogging SPST SMD Tactile Switches1
SS-12D10L3SW2SS-12D10L3 — SPDT Slide Switches1
SK-3245D-02-L1SW4SK-3245D-02-L1 — SPDT Slide Switches1

*TPA3118D2 and TPA3130D2 can be used

Download files, links, and notes

Tpa3116 + Mh-M18 Class D Audio Amplifier With Bluetooth Pc B 3D

Download PCB in Gerber, PDF, PNG, SVG
Download

Mirror

Source: https://oshwlab.com/jc040226/tpa3116-amplifier

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Xtronic.org blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.
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2 thoughts on “TPA3116 + MH-M18 class D audio amplifier with Bluetooth”

  1. I am confused about the classification of A, B, AB, D amplifiers: common emitter, common base, common collector
    Where does each of them fit in?

    Reply
    • The classification of amplifiers you mentioned, A, B, AB, and D, refers to different amplifier classes based on their output characteristics. These classes are not directly related to the common emitter, common base, and common collector configurations.

      The common emitter, common base, and common collector are different transistor amplifier configurations commonly used in analog electronics. They define how the transistor is connected to the input and output circuits of the amplifier.

      On the other hand, amplifier classes (A, B, AB, and D) categorize amplifiers based on their output stage design and the conduction angle of the output devices. Here’s a brief overview:

      1. Class A amplifiers: These amplifiers operate in a mode where the output devices (usually transistors) conduct for the entire input signal cycle. They are known for their high linearity but tend to be less efficient as they dissipate power even when there is no input signal.

      2. Class B amplifiers: These amplifiers use a pair of complementary output devices (e.g., NPN and PNP transistors) that conduct during opposite halves of the input signal cycle. Class B amplifiers are more efficient than Class A, but they introduce some distortion due to a small overlap region between the conducting devices.

      3. Class AB amplifiers: Class AB amplifiers are a compromise between Class A and Class B. They have a small bias current flowing through the output devices even when there is no input signal. This biasing reduces distortion and crossover distortion present in Class B amplifiers.

      4. Class D amplifiers: Unlike the previous classes, Class D amplifiers use a different approach. They convert the input signal into a series of pulses, which are then amplified by rapidly switching output devices (typically MOSFETs) on and off. This switching action allows Class D amplifiers to achieve high efficiency while sacrificing some linearity.

      To summarize, the common emitter, common base, and common collector configurations represent different ways of connecting transistors in amplifier circuits. On the other hand, amplifier classes (A, B, AB, and D) classify amplifiers based on their output stage design and the conduction angle of the output devices.

      Reply

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