Chat

Welcome to Flux

Treat Flux like your intern. Tell it what you'd like to build and it'll get to work. You can also ask it questions, brainstorm ideas, and teach it your preferences. Learn More

Explain project
Write a project description
Find schematic issues
Create a test plan
Simulate a circuit
Prepare for Manufacturing
Component Selection Workflow
New Subsystem Wizard
Sign up to send
https://www.youtube.com/watch?v=qO\_KH8jIUO0
nico

nico

@copilot what other components am I missing in my project?
2y

copilot

The following components are needed for your audio amplifier project:
  1. Audio Input: You'll need a 3.5mm Audio Jack for line input and a Bluetooth 5.0 module for wireless audio input.
  2. 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.
  3. Volume Control: A potentiometer can be used to control the volume.
  4. Output: To send the amplified signal to speakers, you'll need screw terminals. Additionally, we suggest using a protection circuit for the speakers.
  5. 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.
  6. 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.
2y
nico

nico

@copilot can you recommend an audio amplifier for my project?
2y

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.
2y
2y
2
U1 GND - U2 AGND
U1 GND - U2 AGND
U1 GND - U2 AGND
U1 GND - U2 AGND
U1 GND - U2 AGND
U1 GND - U2 AGND
U1 GND - U2 AGND
R6
Resistance
500 Ω
SW2
R4
Resistance
500 Ω
R2
Resistance
500 Ω
R3
Resistance
500 Ω
R7
Resistance
500 Ω
SW3
SW1
R5
Resistance
500 Ω
R1
Resistance
500 Ω
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

Audio Electronics | Copilot Preset

Audio Electronics | Copilot Preset thumbnail
Servo Control Module with Battery Protection and UI for 100×60×50 mm Enclosure

Properties

R8

Audio

U2:VOUT → J1:5V

J1

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

100 × 60 × 50 mm

10×6×5 cm

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

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

5 min up to 300 min

Diagram



  
    
  
  
    
  


















I2C

PWM

ADC

GPIO

GPIO

GPIO












Li-ion node_1S Battery
USB-C Charger IC
Voltage Divider & Brown-out Detect
Boost Converter node_5V
LDO 3.3V Regulator
Microservo
Microcontroller
OLED I2C Display
Button +
Button −
Button Info
TVS & Fuses

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

U4:PA9 → R8 → J1

U4:PA9

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

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

100 × 60 mm

mm

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

1–10 min (default 2 min)

0.5–1 A

A

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

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

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

RoHS, FCC, CE

12V

-40 ºC to 85ºC

LED, Potentiometer

Bluetooth 5.0, 3.5mm Jack, Screw Terminals

Class D

Line-level from standard audio source

2 (stereo)

THD of less than 0.1% at full power

20Hz to 20kHz

Hz

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