Audio Input: You'll need a 3.5mm Audio Jack for line input and a Bluetooth 5.0 module for wireless audio input.
Power Supply: You need a power supply unit. Since your operating voltage is 12V, you can use a DC power supply that provides the required voltage and current.
Volume Control: A potentiometer can be used to control the volume.
Output: To send the amplified signal to speakers, you'll need screw terminals. Additionally, we suggest using a protection circuit for the speakers.
Indicator: You specified the use of an LED in your design. This can be used to indicate power on/off status, or Bluetooth pairing status.
Filter: It would be good to have an audio filter to eliminate unwanted frequencies and noise.

Please note that the specific components you select will have to maintain a THD (Total Harmonic Distortion) of less than 0.1% at full power, have a frequency response between 20Hz to 20kHz, and operate between -40 ºC to 85ºC as these are your project requirements.

Please make sure to select the components which are RoHS, FCC, and CE compliant.

You also need to ensure that the selected Class D amplifier can deliver the required output power for your project, which is not specified in the project description.

nico

@copilot can you recommend an audio amplifier for my project?

copilot

Your project criteria suggest you are looking for a Class D audio amplifier with a frequency response from 20Hz to 20kHz and a total harmonic distortion (THD) of less than 0.1% at full power. The TPA3116D2 by Texas Instruments would be a suitable fit for your project. It has a bandwidth of 20Hz to 20kHz, and it provides a class D operation with high efficiency and low distortion.

Moreover, it has an excellent thermal performance, operating from -40 ºC to 85ºC, which matches your project requirement. The TPA3116D2 can deliver up to 100W into a 2Ω load and 50W into a 4Ω load from a 12V supply, which should be more than sufficient for a stereo setup, considering that your project requires two channels.

Don't forget to consider other components that you might require, such as Bluetooth modules for connectivity, 3.5mm Jack for audio input, LED for user interface, and power supply components considering your operating voltage is 12V.

Please remember the above recommendation is based on the project description provided, for detailed design and connection of components, a design schematic will be needed.

nico

U1 GND - U2 AGND

Resistance

500 Ω

Resistance

500 Ω

Resistance

500 Ω

U1 GND - U2 AGND

Resistance

500 Ω

U1 GND - U2 AGND

Resistance

500 Ω

U1 GND - U2 AGND

Resistance

500 Ω

Resistance

500 Ω

U1 GND - U2 AGND

SW2

SW3

SW1

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Project Name

Audio Electronics | Copilot Preset

Description

Servo Control Module with Battery Protection and UI for 100×60×50 mm Enclosure

Properties

Servo Ser…Resistor

Domain A…lication

Audio

High-curr… 5V path

U2:VOUT → J1:5V

Servo Ou…nnector

UI placement

OLED at top center, buttons "+" and "−" positioned 15 mm below the OLED

Enclosur…ensions

100 × 60 × 50 mm

Enclosur…ensions

10×6×5 cm

Placement Zones

Left 40 mm reserved for power subsystem; right 40 mm reserved for signal and UI; ensure tube channel 100×20 mm on rightmost edge

Decouplin… Entries

C3 (U3 VIN bulk)=10μF near U3 VIN (bulk), C4 (U3 OUT)=1μF at U3 OUT, C5 (U4 VDD)=100nF close to U4 VDD, C6 (U4 VDDA)=100nF close to U4 VDDA, all X7R 0402. Role: Decoupling, placement: as close as possible to respective IC pins

Time Increment

5 min up to 300 min

System Architecture

Diagram

Electrical Checklist

Brown-Out Detector settings; VBAT voltage-divider design for ADC measurement; I2C pull-up resistor configurations; Decoupling capacitor placement and values

Servo Signal Path

U4:PA9 → R8 → J1

Servo PW…tput Pin

U4:PA9

BOD Settings

Threshold 2.7V, Recovery 2.9V, 10 ms debounce; STM32 BOD + software filtered

ERC Results

No ERC issues detected for decoupling_caps, pull_up_pull_down, resistor_power_rating, and capacitor_voltage_rating.

Board size

100 × 60 mm

Role Det…nal Path

PWM output from MCU (U4:PA9) passes through series resistor (R8) before reaching the servo connector (J1) for signal integrity and protection.

Open Dur…n Range

1–10 min (default 2 min)

USB-C Ch…t Range

0.5–1 A

VBAT→AD…Divider

R3=100kΩ, R4=33kΩ, Ratio 0.248, Voltage Range 0–4.2V Li-ion mapped to 0–1V ADC, Pin=U4:PA1

I2C Pull-…urations

R1 (SCL)=4.7kΩ, R2 (SDA)=4.7kΩ, 0402 package, Nets: SCL=U4:PA9 & OLED SCL; SDA=U4:PA7 & OLED SDA

Tube Cha…ervation

100×20 mm zone at the right lateral edge of the PCB

Compliance

RoHS, FCC, CE

Operating Voltage

12V

Operatin…perature

-40 ºC to 85ºC

Human Interface

LED, Potentiometer

Connectivity

Bluetooth 5.0, 3.5mm Jack, Screw Terminals

Amplifier Type

Class D

Input Source

Line-level from standard audio source

Output Power

Number …hannels

2 (stereo)

Distortion

THD of less than 0.1% at full power

Frequen…esponse

20Hz to 20kHz

Pricing & Availability

Distributor	Qty 1
Arrow	$4.89–$7.90
Digi-Key	$6.87–$11.00
LCSC	$12.11–$12.18
Mouser	$15.31
TME	$11.71
Verical	$1.88–$5.35

Controls

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nico / Audio Electronics | Copilot Preset

Schematic