TPA3110 Mini D class power amplifier TPA3110D2 diy

TPA3110 Mini D power amplifier TPA3110D2 15w

Mini D class power amplifier (TPA3110D2), Based on the TPA3110 digital audio power amplifier with preamplifier, it supports a power output of 30W.  Some adjustments were made in the schematic design and the actual test results are good.

Tpa3110 Mini D Class Power Amplifier Tpa3110D2
Tpa3110 Mini D Class Power Amplifier Tpa3110D2

Schematic TPA3110 Mini D class power amplifier TPA3110D2 with preamplifier

Schematic Tpa3110 Mini D Class Power Amplifier Tpa3110D2

About IC TPA3110 TPA3110d2

The IC TPA3110 TPA3110d2 is a highly efficient Class-D audio amplifier integrated circuit. It is designed to deliver high-quality audio performance in a compact and cost-effective package. The TPA3110d2 offers a wide operating voltage range, making it versatile and suitable for a variety of applications. Its advanced protection features, such as short-circuit and thermal protection, ensure the safety and longevity of the amplifier. With its low power consumption and minimal external components required, the IC TPA3110 TPA3110d2 is an ideal choice for powering audio systems in portable devices, home theater systems, and automotive applications.

Due desire to own a good-quality mini amplifier, and couldn’t find a suitable one after browsing on a certain online marketplace. Therefore, the author decided to design this portable mini audio amplifier module for yourself. It is based on the TPA3110D2 digital amplifier, with a driving power of 30W, which is sufficient for everyday use as a study or bedroom speaker driver.

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Tpa3110 Mini D Class Power Amplifier Tpa3110D2 30W
Mini D Class Power Amplifier

The author made some adjustments to eliminate pop noise and background current noise, and added a power on/off mute circuit to the SD pin. During the sliding process of the adjustable potentiometer, there may be some high-frequency noise generated, so added two 10nF capacitors to ground for filtering (which proved to be effective).

It is recommended to use a power supply voltage of 15V-20V, which can effectively eliminate background current noise. The audio source input uses two 1uF Wima capacitors as the left and right channel inputs, and the front stage follows the output voltage to achieve isolation between the input and output.

BOM Mini D class power amplifier with preamplifier

Value Designator Description Quantity
1uF C1,C6,C11,C20,C21,C22,C23 0805 – SMD ceramic capacitor 7
220nF C2,C9,C10,C19 C0805 – SMD ceramic capacitor 4
680nF C3,C7,C12,C14 C0805 – SMD ceramic capacitor 4
10nF C4,C8,C13,C15,C17,C18 C0805 – SMD ceramic capacitor 6
0.1uF C24,C25,C30,C31,C35,C36 C0805 – SMD ceramic capacitor 6
1nF C32,C33 C0805 – SMD ceramic capacitor 2
1uF C5,C16 Film capacitor 2
680uF C26,C27 Electrolytic capacitor 2
47uF C34 Electrolytic capacitor 1
100k (104) R1,R6,R16,R21,R23 0805 – SMD resistor 5
20k (203) R2,R15,R20 0805 – SMD resistor 3
5.1k (512) R3 0805 – SMD resistor 1
10 (10R) R4 0805 – SMD resistor 1
10k (103) R5,R10,R11,R18,R19,R22 0805 – SMD resistor 6
1k (102) R7 0805 – SMD resistor 1
3.3R (3r3) R8,R13,R14,R17 0805 – SMD resistor 4
51k (513) R9 0805 – SMD resistor 1
RK09712200MY R12 RK097 – 50K (503) Potentiometer 1
SS34 D1 SMA -40V 3A Schottky Barrier Diodes (SBD) 1
LED0 LED1 LED 3mm red 1
S8050 Q1 SOT-23-3 – SMD NPN transistor 1
TPA3110D2PWP TPA3110D2 HTSSOP-28-EP Audio Power OpAmps 1
MC4558G U1,U3 SOIC-8 – Dual operational amplifier 2
CJ78L12_C8615 U4 SOT-89-3 – Voltage regulator 12V 1
7101P1YAV2BE SW1 SPDT Straight Plugin Toggle Switches 1
DC-005-20A DC1 2 mm 6.4 mm Plugin AC/DC Power Connectors 1
CD74R-33uH L1,L2,L3,L4 SMD inductor 7.8×7.2 mm 4
PJ-327ST-SMT AUX 3.5 mm headphone jack SMD Audio Connectors 1
CONN-TH_4P-P5.08_HT508R-5.08-4P L+ Terminal block 5.08 mm 4 pin 1

Download files, links, and notes

Tpa3110 Mini D Class Power Amplifier Tpa3110D2 Pcb 3D
Pcb 3D

Download PCB in Gerber, PDF, PNG, SVG

Tpa3110 Mini D Class Power Amplifier Tpa3110D2 Pcb 2




Tpa3110 Mini D Class Power Amplifier Tpa3110D2 Pcb

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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.

1 thought on “TPA3110 Mini D class power amplifier TPA3110D2 diy”

  1. Hi Toni, thanks for this great article! I’m just learning electronics and I’m wondering about the right channel output. I look at the schematic and datasheet and found that pin 18 is positive output for R channel, but in the PCB it end up as R-, while the pin 20 is negative R channel but it end up as R+.. is it ok that the output are wired reversed like this? Any particular reason why it reversed?


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