• Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
  • Ground
    A common return path for electric current. Commonly known as ground.
  • Net Portal
    A net identifier used to create connectivity to other Net Portal with the same designator. #portal
  • Power Net Portal
    Power net portal is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design. Power nets of the same designator automatically connect throughout your design #portal #power
  • Generic Resistor
    A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
  • Generic Capacitor
    A generic fixed capacitor for rapid developing circuit topology. 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 10,000uF 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 20pF 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
  • Generic Inductor
    A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
  • 875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
  • CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
  • 1070TR
    Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
RV3
Resistance
10k Ω
RV2
Resistance
10k Ω
PowerNet1
GND
PowerNet1
GND
Capacitance
100 nF
RV4
Resistance
10k Ω
GND
Capacitance
100 nF
PowerNet1
Capacitance
100 nF
GND
PowerNet1
GND
PowerNet1
RV1
Resistance
10k Ω
Capacitance
100 nF

Audio Electronics | Copilot Preset ofts

Audio Electronics | Copilot Preset ofts
Description

Created
October 16th 2024
Last updated by adarsh
a month ago
1 Contributor(s)
adarsh

Controls

Properties

Domain Application
Audio
Compliance
RoHS, FCC, CE
Operating Voltage
Operating Temperature
-40 ºC to 85ºC
Human Interface
Connectivity
Amplifier Type
Class D
Input Source
Line-level from standard audio source
Output Power
Number of Channels
2 (stereo)
Distortion
THD of less than 0.1% at full power
Frequency Response
20Hz to 20kHz

Availability & Pricing

DistributorQty 1
Arrow$2.58–$2.58
Digi-Key$7.15–$7.52
LCSC$0.01
Mouser$7.24
Verical$4.43–$4.75

Assets

    Thumbnail
  • thumbnail
    Aerospace Template Thumbnail (3).png

    id=Aerospace Template Thumbnail (3)

Simulation

µs

Simulation Speed

i just did some research.. i wil use the arduino pro micro, then 4 sliders non m...
@copilot i just did some research.. i wil use the arduino pro micro, then 4 sliders non motorized! thats all !
1mo
Great choice! The Arduino Pro Micro is a compact and versatile board that should work well for your audio project, especially if you're working with sliders to control parameters like volume or tone.
Let's discuss how you might connect these components:

  1. Sliders (Potentiometers):

    • Since you have 4 sliders, you'll be using the analog pins on the Arduino.
    • Typically, each slider will have three pins: VCC, GND, and a middle terminal that you connect to an analog input on the microcontroller.
    • You can power the sliders with 5V from the Pro Micro and connect the GND to common ground.
    • Connect the middle terminal of each slider to one of the analog pins on the Arduino Pro Micro.
Here's a suggestion for connecting one slider to the Arduino Pro Micro:

  • Slider 1:

    • Connect VCC to Arduino:5V
    • Connect GND to Arduino:GND
    • Connect the middle pin to Arduino:A0
You can follow the same pattern for the other sliders, using the next available analog pins (A1, A2, A3).

  1. Connecting to the Audio System:

    • Depending on what functionality you want from these sliders (e.g., modifying volume, bass, etc.), you'll need to integrate the Arduino outputs into the rest of your audio system.
    • If each slider controls something different, ensure your program on the Arduino addresses how these inputs change your audio outputs.
Let me know if you need more specific details or further assistance on integrating these components!
1mo
okay can you check the schematic? is it correct?
27d
Since I can't view schematics directly, please provide a textual description of your connections, and I'll be happy to review them for you. Just let me know how you've connected the Arduino Pro Micro and the four sliders.
27d
okay i will not get into complex stuff i will start somehwere small practical an...
@copilot okay i will not get into complex stuff i will start somehwere small practical and usable! i want to build a control surface midi controller. i will use this to modulate my volume, pitch and so on using CC automation from computer software plugins! i want 4 vertical volume slider parts. i want the board to be connected to my laptop using usbA. suggest parts for this
1mo
Great choice! A MIDI controller is a practical and rewarding project. Let's break down what you'll need for your MIDI controller and suggest some parts:
Key Components:

  1. Microcontroller with USB Support:

    • You can use a microcontroller like the ATmega32U4, which supports USB communication directly on the chip and is commonly used in MIDI controller projects.
  2. Sliders:
  3. MIDI Interface:

    • The MIDI interface will be handled through the USB connection, so you will need the necessary firmware on the microcontroller to send MIDI messages over USB.
  4. USB Connector:

    • A USB-A connector or a USB micro-B for connecting to your laptop can be used. Choose a part like USB Micro-B Receptacle.
  5. Additional Components:

    • Resistors and Capacitors: For any necessary pull-up or debouncing circuits.
    • LEDs: Optional, for status indicators or feedback.
    • Knobs: For the sliders, if they don't come included.
  6. Power Supply:

    • The microcontroller and USB connection can often handle power supply through the USB connection itself.
Suggested Connections:

  • Connect each slider to an analog input on the microcontroller.
  • Connect the USB pins to the respective USB on-the-go (OTG) or USB host pins on the microcontroller.
  • Ensure the microcontroller firmware is programmed to interpret analog values from the sliders into MIDI Control Change (CC)(CC) messages.
Steps Forward:

  • Design the Schematic: Draw a schematic of your circuit in Flux, placing each component and making the necessary connections.
  • Firmware Development: You'll need to write or use existing firmware for sending MIDI messages. Look into existing library solutions for MIDI over USB like the Arduino MIDI library.
  • PCB Layout: Once the schematic is done, you can proceed to design the PCB layout on Flux.
Would you like more detailed instructions on any particular step?
1mo
yes give me detailed instructions and steps
1mo
Certainly! Here’s a more detailed breakdown to guide you through designing and building your MIDI controller.
Step 1: Design the Schematic

  1. Create the Flux Project:

    • Open Flux and start a new project. You can use the "Audio Electronics" template as a starting point.
  2. Place the Microcontroller:

    • Search for and place the ATmega32U4 in your schematic.
  3. Add Sliders:

    • Place four 10k Ohm linear potentiometers on the schematic.
    • Connect the center pin (wiper) of each slider to an analog input pin on the ATmega32U4.
  4. USB Connector:

    • Place a USB Micro-B Receptacle.
    • Connect the USB D+ and D- lines to the respective USB pins on the ATmega32U4.
    • Connect VBUS to the microcontroller’s power input, ensuring there’s a proper power regulation circuit if needed.
  5. Add Resistors and Capacitors:

    • Include pull-up resistors for the microcontroller’s reset pin if necessary.
    • Any necessary bypass capacitors or decoupling capacitors for stable operation.
  6. Add LEDs (Optional):

    • You can add simple status LEDs driven by one of the microcontroller's GPIO pins.
  7. Finalize Connections:

    • Ensure every component is correctly grounded and powered.
Step 2: Develop Firmware

  1. Choose a Platform:

    • You can use the Arduino IDE, as it supports the ATmega32U4. Install the necessary board support package for the ATmega32U4.
  2. Set Up MIDI Library:

    • Install MIDIUSB library (or similar) for sending MIDI messages over USB.
  3. Code Structure:

    • First, set up MIDI over USB in your setup code.
    • In the loop, read the analog values from the potentiometers.
    • Convert these analog values into MIDI Control Change CCCC messages and send them over USB.
  4. Test the Firmware:

    • Connect your board to a computer and test if it’s recognized as a MIDI device.
    • Use MIDI monitoring software to ensure it's sending messages correctly.
Step 3: PCB Layout Design

  1. PCB Layout in Flux:

    • Transfer your schematic design to the PCB layout in Flux.
    • Place all components carefully, considering routing for analog signals from the potentiometers.
    • Route the traces, ensuring the power and ground planes are solid.
  2. Design Rules Check:

    • Perform a design rule check (DRC) to ensure the PCB meets manufacturing requirements.
  3. Export and Manufacture:

    • Once satisfied, export the Gerber files for manufacturing.
    • Choose a fabrication service to produce your PCB.
Step 4: Assembly and Testing

  1. Component Soldering:

    • Once you receive the PCB, assemble the board by soldering all components.
  2. Installation and Testing:

    • Load the firmware onto the microcontroller.
    • Test each slider and ensure it's sending the correct MIDI CCCC messages by connecting it to your computer and using a DAW (Digital Audio Workstation).
  3. Calibration and Tuning:

    • If the sliders don’t respond as expected, consider adjusting the firmware to fine-tune the sensitivity and response.
Feel free to ask if you need any more detailed explanations on a specific part of this process!
1mo
okay lets build a new project shall we. my ultimate goal is to build a 8 step se...
@copilot okay lets build a new project shall we. my ultimate goal is to build a 8 step sequencer for my music production. here is the gist. i want a system where i turn the knob i can get the oscillator to work and the oscillator sound has to go to the step sequencer. i want speed control and individual pitch control for each step. i have enclosures made so you can add necessary knobs and jacks. tell me all the parts i will need to make this work
1mo
Creating an 8-step sequencer for music production can be an exciting project! Let's break down the main components you might need to achieve your goal:
Main Components

  1. Microcontroller: To handle the sequencing logic, you'll need a microcontroller with enough GPIO (General Purpose Input Output) pins.
  2. Oscillator: For generating sound, you'll want a voltage-controlled oscillator (VCO).

    • Recommended: A simple analog VCO module or integrated VCO IC like the NE555 Timer for basic sound generation.
  3. Digital-to-Analog Converter (DAC): This will convert digital signals from the microcontroller into analog voltages to control the oscillator.

    • Recommended: A basic 8-bit or 12-bit DAC like the MCP4725.
  4. Control Knobs and Switches:

    • Potentiometers for pitch control for each step (8 potentiometers, one for each step).
    • Speed Control: One potentiometer for controlling the speed of the sequence.
    • Step Activation: Toggle switches could allow you to enable/disable steps.
  5. Audio Jack: For outputting the sequencer audio to an amplifier or mixer.

    • Recommended: 3.5mm audio jacks.
  6. Enclosure and Panel: Since you have enclosures made, you'll need panels for mounting the knobs, switches, and jacks.
  7. Power Supply: Ensure all components are powered correctly. A 9V or 12V DC supply might be suitable, depending on your components.
Optional Components

  • LEDs: For step indication to visually show which step is active.
  • Button/Switch for Start/Stop: To control the operation of the sequencer.
Summary of Connections

  1. Microcontroller: Connect potentiometers, switches, and output to the microcontroller's GPIOs.
  2. DAC to VCO: Connect the output of the DAC to the control voltage input of the oscillator.
  3. Oscillator Output to Audio Jack: Connect the audio output of the VCO to the audio jack.
  4. Power Supply Connections: Ensure all components are properly powered.
Does this outline fit your project, or is there any additional functionality you have in mind?
1mo
i dont want to use a microcontroller. suggest alternatives
1mo
If you prefer not to use a microcontroller, you can create an 8-step sequencer using purely analog components. Here's an alternative approach using counter ICs, logic gates, and other analog components:
Main Components

  1. Clock Oscillator: Generate a clock signal to drive the sequence. You can use a 555 Timer IC configured in astable mode to create the clock pulse.
  2. Counter IC: Use a digital counter to cycle through your steps.

    • Recommended: CD4017 Decade Counter, which can count up to 10 steps. You'll just use the first 8 outputs for your sequencer.
  3. Analog Multiplexer/Demultiplexer: To handle pitch control voltages for each step.
  4. Voltage-Controlled Oscillator (VCO): For generating sound based on the sequencer's control voltage.

    • Recommended: Any basic VCO circuit or module that accepts control voltages.
  5. Potentiometers: For individual pitch control of each step (8 potentiometers total).
  6. Speed Control: An additional potentiometer to adjust the clock oscillator speed.
  7. Step Activation Switches: SPST toggle switches to enable or disable each step.
  8. Audio Jack: For outputting the VCO audio.
Optional Components

  • LEDs: To indicate the currently active step. Connect these to the outputs of the CD4017 counter through current-limiting resistors.
  • Start/Stop Toggle Switch: To control the sequencer operation by enabling/disabling the clock signal.
Summary of Connections

  1. 555 Timer: Connect the output to the clock input of the CD4017 counter.
  2. CD4017 Counter: Connect the 8 outputs to the 8-channel multiplexer and to LEDs (optional for step indication).
  3. CD4051 Multiplexer: Connect each input to a corresponding potentiometer, and the output to the control voltage input of the VCO.
  4. VCO Output: Connect the audio output to the audio jack.
  5. Power Supply: Ensure all components receive the correct voltage, typically 9-12V for analog ICs.
This setup will give you an 8-step sequencer without the need for a microcontroller, using only analog components. Let me know if you need more details or specific circuit connections!
1mo
yes can you build a setup for me
1mo
Absolutely! I'll walk you through a basic setup for an 8-step sequencer using the components mentioned. This design will be based on the CD4017 counter and a CD4051 multiplexer.
Basic Circuit Setup 1. Clock Oscillator with 555 Timer

  • Purpose: To generate clock pulses for the sequence steps.
  • Configuration: Connect the 555 Timer in astable mode.

    • Components:

      • 555 Timer IC
      • Resistors: $R_1$ and $R_2$
      • Capacitor: $C_1$
      • Speed control potentiometer for variable resistance
  • Connections:

    • Connect 555:Pin 4 (Reset) to VCC.
    • Connect 555:Pin 8 (VCC) to your power supply.
    • Connect 555:Pin 1 (Ground) to ground.
    • Connect 555:Pin 2 (Trigger) to 555:Pin 6 (Threshold).
    • Connect 555:Pin 2 to 555:Pin 7 (Discharge) through $R_1$ and $R_2$.
    • Connect a capacitor ($C_1$) between 555:Pin 2 and ground.
    • Attach the speed control potentiometer between VCC and 555:Pin 7.
    • The clock output will be from 555:Pin 3.
2. CD4017 Decade Counter

  • Purpose: To provide 8 sequential logic outputs.
  • Connections:

    • Connect CD4017:CLK to 555:Pin 3 for the clock input.
    • Connect CD4017:Pin 16 (VCC) to power supply.
    • Connect CD4017:Pin 8 (Ground) to ground.
    • Use CD4017:Q0 to Q7 as your step output connections.
3. CD4051 8-Channel Multiplexer

  • Purpose: To route one of the 8 potentiometer settings to the VCO based on the current step.
  • Connections:

    • Connect CD4051:Pin 16 (VCC) to power supply.
    • Connect CD4051:Pin 8 (Ground) to ground.
    • Connect each multiplexer input (S0-S7) to a corresponding potentiometer output.
    • Connect each CD4051:Select pin to CD4017:Q0-Q7 respectively to enable selection.
    • Connect multiplexer output to the control voltage input of the VCO.
4. Voltage-Controlled Oscillator (VCO)

  • Connections:

    • Connect the multiplexer output to the frequency control input of your VCO.
5. Output to Audio Jack

  • Connections:

    • Connect the audio output of the VCO to the audio jack for external connections.
Additional Features

  • LED Indicators:

    • Connect LEDs through resistors connecting to each CD4017:Q0-Q7 output for visual representation of step activation.
  • Step Activation Switches:

    • Place an inline toggle switch between each CD4017:Q output and the corresponding CD4051 selector line to enable or disable steps.
Power Supply

  • Ensure all components are powered properly, typically 9-12V DC.
Diagram Concept
To give you a clearer understanding, you can visualize the block diagram of this setup. I'll summarize it in text format:
555 Timer (Clock) --> CD4017 (Counter) --> CD4051 (Multiplexer) --> VCO
                                                |              |
                                            Potentiometers   LEDs
This setup should give you a functional 8-step analog sequencer. If you have specific preferences or additional requirements, feel free to let me know!
1mo
Hi! I’m Copilot, I’m here to help you design your hardware projects. Ask me anyt...
Hi! I’m Copilot, I’m here to help you design your hardware projects. Ask me anything:
@copilot explain this project.
@copilot are there any issues in this project?
@copilot how can I build a schematic with Flux?
To learn more, check out Getting Started with Copilot.
1mo
I want to build the best high quality Bluetooth speakers. I want usb c. I want an almost accurate flat frequency response. I want also three controller knows to control bass mid and treble. Please help
1mo
That sounds like a great project! Let's break down what you need and how we can go about designing this:
Requirements

  1. Bluetooth Connectivity: You'll need a Bluetooth module that supports high-quality audio streaming, like Bluetooth 5.0.
  2. USB-C Port: For power or data transfer.
  3. Flat Frequency Response: This suggests we'll need high-quality components in both the amplifier and the speaker drivers to achieve this.
  4. Tone Control (Bass, Mid, Treble): Implementing a tone control circuit with three knobs.
  5. Amplifier: A high-quality Class D amplifier is a good choice due to its efficiency, especially for portable devices.
  6. Speaker Drivers: Choose drivers with a good frequency response that complement the amplifier.
Next Steps

  1. Select Components for Each Requirement:

    • Bluetooth Module: Look for one with aptX or AAC support for better audio quality.
    • USB-C: Consider if the port will only be for power or if it will also be for data.
    • Tone Control Circuit: I can help you design this using potentiometers.
    • Class D Amplifier: Look for one with low Total Harmonic Distortion (THD) to maintain audio quality.
    • Speaker Drivers: Choose based on desired power output and frequency response.
  2. Design the Circuit:

    • I'll guide you on how to lay out the circuit and make connections between components.
  3. PCB Design:

    • Once the schematic is ready, we can move to the PCB layout in Flux.
Let’s Start With the Amplifier

  • Class D Amplifier: You could consider something like a TPA3116D2, which is popular for DIY speaker projects and provides good sound quality with low THD.
Connections
Do you have any specific components in mind, or shall we go through suggestions for each one? Let me know how you'd like to proceed!
1mo
Okay I Want usb c only for charging. This speaker I'm planning to sell so I want great quality with loud sound in a compact design. I want to able to easily hold it in my hand. Let's keep the speaker wattage to be 50 to 100W. You can choose the best one based on the design criteria.
1mo
Great! Let's focus on designing a compact yet powerful Bluetooth speaker with USB-C charging. Here’s a breakdown of the design we can work on:
Design Overview

  1. Form Factor: Portable, hand-held design.
  2. Power Rating: 50-100W.
  3. High-Quality Audio Components: Achieve a nearly flat frequency response.
  4. Tone Control: Three knobs for Bass, Mid, Treble.
  5. Charging via USB-C.
Suggested Components

  1. Class D Amplifier: A TPA3116D2 can output about 50W per channel with high efficiency and low THD. It's compact yet powerful, fitting well within your design constraints.
  2. Bluetooth Module: Something like a CSR8675 or an equivalent module, supporting Bluetooth 5.0 with aptX for high-quality audio streaming.
  3. USB-C Charging Circuit: Use a USB-C charging IC like the BQ25601 to manage power delivery safely.
  4. Tone Control Circuit: Utilize a standard tone control IC or design with discrete components and three potentiometers for user control over Bass, Mid, and Treble.
  5. Speaker Drivers: Choose full-range drivers with a good frequency response that match the power output but physically fit within the portable enclosure.
Circuit Design Approach

  • Power Supply: Design a power management circuit to regulate voltage and current from the USB-C input to the amplifier and Bluetooth module.
  • Amplifier and Bluetooth: Ensure the amplifier is paired correctly with the Bluetooth module for seamless audio streaming.
  • Tone Control: Implement a multi-band equalizer circuit which can be connected to the amplifier input.
  • Connection Layout:

    • Connect TPA3116D2:IN+\text{TPA3116D2:IN+} to CSR8675:AUDIO_OUT_L\text{CSR8675:AUDIO\_OUT\_L} and TPA3116D2:IN-\text{TPA3116D2:IN-} to CSR8675:AUDIO_OUT_R\text{CSR8675:AUDIO\_OUT\_R}.
    • Connect Tone Control:Output to TPA3116D2:IN+\text{TPA3116D2:IN+} and IN-\text{IN-} as needed for each channel.
Next Steps

  1. Schematic Design: I’ll guide you in setting up the schematic on Flux based on component selection.
  2. PCB Layout: After the schematic, design an efficient PCB layout for compactness and thermal management.
Would you like to start with a particular part of the schematic, or do you have more questions about the components or design? Let me know how you'd like to proceed!
1mo
Start with the full schematic design
1mo
Great! Let's outline the major blocks in your schematic design for the Bluetooth speaker, then we can proceed with more detailed connections.
Schematic Design Blocks

  1. Power Management: Handles power from the USB-C port and delivers it to the other circuits.
  2. Bluetooth Module: Receives audio signals wirelessly.
  3. Tone Control Circuit: Allows adjustment of bass, mid, and treble frequencies.
  4. Amplifier: Amplifies the audio signals for the speaker output.
  5. Speaker Outputs: Drives the speakers with the amplified signal.
Detailed Schematic Connections 1. Power Management Circuit

  • USB-C Port connected via a BQ25601 charger IC.

    • Connect USB-C:VBUS to BQ25601:VBUS.
    • Connect BQ25601:OUT to the power rail of your circuit, powering both Bluetooth and amplifier.
2. Bluetooth Module

  • CSR8675 for receiving and converting Bluetooth audio.

    • Connect CSR8675:VDD to power rail.
    • Connect CSR8675:GND to ground.
    • Connect CSR8675:AUDIO_OUT_L and AUDIO_OUT_R to the tone control circuit.
3. Tone Control Circuit

  • Using potentiometers and passive components for Bass, Mid, and Treble.

    • Connect CSR8675:AUDIO_OUT_L to Tone Control:Input L.
    • Connect CSR8675:AUDIO_OUT_R to Tone Control:Input R.
    • Output of Tone Control to Amplifier Input.
4. Amplifier

  • TPA3116D2 for amplification.

    • Connect TPA3116D2:IN+ to Tone Control:Output L.
    • Connect TPA3116D2:IN- to Tone Control:Output R.
    • Connect TPA3116D2:VCC and GND to power rail.
5. Speaker Outputs

  • Connect TPA3116D2:OUT+ and OUT- to Speaker Left and Speaker Right respectively.
Design Assumptions

  • Speakers match the amplifier's power rating and impedance specifications.
  • Ensure that all components are RoHS, FCC, and CE compliant.
Feedback and Next Steps

  • Would you like inputs on specific parts of the circuit, such as component values for the tone control?
  • When you're ready, I can also help with the PCB design phase in Flux.
Let me know how you’d like to proceed, or if there’s any specific block you’d like more detail on!
1mo
Wait, there has to be changes. Since this is a Bluetooth speaker it needs to have a battery as well. Let's just say I'm aiming for 8hrs continously playback with battery. So suggest battery and battery management system as well. Then for the tone control please use active components so we can achieve a better sound quality.
1mo
Got it! Let's add a battery and a battery management system to support continuous playback, and we'll utilize active components for improved tone control.
Updated Components

  1. Battery and Management:

    • A Lithium-Ion battery with an appropriate capacity for 8 hours of playback.
    • A battery management system (BMS) for safe charging and discharging.
  2. Tone Control:

    • An active tone control circuit using operational amplifiers for better control over the audio signal.
Battery and Battery Management Battery Selection

  • For a power output of around 50-100W, assuming approximately 80% efficiency, you need about 125W from the battery.
  • For 8 hours, that's 125W×8h=1000Wh125\text{W} \times 8\text{h} = 1000\text{Wh}.
  • A typical single-cell Li-Ion battery has around 3.7V and if you need 12V output for the system, use a boost converter.
  • Capacity in mAh = (1000Wh12V)×1000=83,333mAh\left(\frac{1000\text{Wh}}{12\text{V}}\right) \times 1000 = 83,333\text{mAh}.
  • Suggestion: Use smaller batteries in parallel for ease of design, e.g., multiple 2500mAh cells.
Battery Management System (BMS)

  • BMS IC: Use something like the BQ4050 for battery management.
  • Connect BMS:VBAT to battery terminals and BMS:VOUT to the power rail of your circuit.
Active Tone Control Tone Control Circuit

  • Use operational amplifiers, e.g., a TL072, for active bass, mid, and treble control.

    • Connect op-amp’s VCC and GND to the power rail.
    • Use potentiometers for tuning Bass, Mid, and Treble with op-amps setting active filter gains.
Revised Schematic Connections

  1. Battery and BMS:

    • Connect Battery + to BMS:VBAT+ and Battery - to BMS:VBAT-.
    • BMS:VOUT supplies power alongside USB-C power.
  2. Power Management:

    • Integrate BMS with USB-C charging using BQ25601.
  3. Tone Control:

    • Connect CSR8675:AUDIO_OUT_L and AUDIO_OUT_R to active tone control circuit inputs.
    • Outputs from tone control op-amps to TPA3116D2 amplifier.
Next Steps

  • Finalize battery specifications based on size, number of cells in parallel, and layout.
  • Design the tone control circuit with detailed component values.
  • Prepare the full schematic in Flux with these components.
Would you like help with specific calculations for the tone control circuit, or proceed to layout suggestions in Flux? Let me know if there's anything else you'd like to adjust or explore!
1mo
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