ESP32 Audio Stream Selector

Selection of the pair of channels will be done with 3 DIP switches.

92 days

flux

0:54

Chat History

Project

Clarifying component references.

Clarifying project plan.

Planning DIP switch integration.

Outlining the project plan.

Got it: you want a 3-bit DIP switch to select the Ultranet channel pair in hardware.

I’ve prepared a plan to add a 3‑position DIP, tie it into the PLD with pull resistors/optional RC, define the 0–7 code-to-pair truth table, and wire through to the DSP/DAC.
Optional: mirror the DIP bits to U3 for status.

Click Start to run the plan. Any preference for pull-up vs pull-down and debounce (yes/no)?

92 days

sakchai01

EXPORT TO PDF

75 days

flux

1:09

Chat History

Project

Help

Checking PDF export instructions.

Using the knowledge tool for PDF export.

Gathering instructions for PDF export.

Using Knowledge Base Tool.

Reading docs about How do I export a Flux project to PDF? Specifically: exporting schematic pages to PDF, PCB layout to PDF, or printing to PDF. If PDF is not supported, what export options exist (Gerbers, images, BOM) and how to produce a PDF alternative?.

Reading docs about Does Flux support exporting schematics or PCB layout to PDF, or printing to PDF? If yes, where is the command and what steps? If not, what export formats are available?.

Considering export alternatives.

This is what the Flux documentation says about exporting a schematic to PDF:

“Can I export my schematic as a PDF?

No, you cannot export a PDF of your schematic from Flux right now.” Source

Which did you want to export to PDF: the schematic or the PCB layout?

75 days

Started implementing a plan

# Goal

- Integrate a 3-bit DIP switch into the Portable Audio DSP project to select the Ultranet channel pair in hardware. The DIP switch setting will feed the PLD, which decodes the 3-bit code and routes the corresponding two audio channels to the DSP and DAC.

# Implementation plan

1. **DIP Switch Integration**

1. Place a 3-bit DIP switch footprint in the schematic.

2. Connect each DIP pole to dedicated PLD input pins with appropriate pull-up or pull-down resistors to ensure stable logic levels.

3. Optionally add RC debounce circuits for noise immunity.

2. **PLD Logic Setup**

1. Define the 3-bit truth table mapping (codes 0–7) to the eight possible channel pairs.

2. Modify the PLD symbol to expose the DIP switch input pins and document the channel pair associations as part of the design notes.

3. **Routing to Audio System**

1. Connect the PLD outputs corresponding to the selected channel pair to the I2S/TDM path leading to the DSP and DAC.

2. Ensure all routing remains on the safe (non-isolated) side of the barrier.

4. **Optional ESP32 Status Monitoring**

1. Route the DIP switch signals to the ESP32 GPIOs as status inputs, verifying that the 3.3V logic levels are met.

2. Label these nets clearly for documentation and testing purposes.

# Success criteria

- A 3-bit DIP switch is integrated and correctly feeds the PLD inputs with stable logic levels (enhanced by pull-ups/pull-downs and optional RC debounce).

- The PLD implements the defined truth table mapping the DIP switch bits (0–7) to eight channel pairs and routes the selected channels to the DSP/DAC.

- Optional routing to the ESP32 for status is completed and verified for 3.3 V compatibility.

- All changes are documented in the design notes, including DIP switch mapping and PLD interface details.

58 days

Stopped due to a problem. Please try again.

recommend a replacement for IC5.

corliss89762

@copilot recommend a replacement for IC5.

Someone is typing...

are all my components in this project RoHS compliant?

jharwinflux

@copilot are all my components in this project RoHS compliant?

copilot

While I don't have access to comprehensive component databases to confirm RoHS compliance for each part directly, I can point out the major manufacturers of the components used in your project. Many modern components from well-known manufacturers are generally RoHS compliant, but it's best to check the specific datasheets or the supplier’s information for RoHS certification:

Resistors and Capacitors: Small passive components like resistors and capacitors from reputable manufacturers (e.g., Yageo, Murata, AVX) are often RoHS compliant. You should confirm the compliance of each part type and manufacturer.
Integrated Circuits (ICs): The major ICs in the project from Texas Instruments, Analog Devices, and other established brands typically adhere to RoHS standards. For instance:
- U1 - ADAU1452 (Analog Devices)
- U2 - PCM1795 (Texas Instruments)
- U3 - ESP32-WROOM-32 (Espressif Systems)
- U7/U8/U9/U10 - OPA1612 (Texas Instruments)
- U11 - TCA6424 (Texas Instruments)
- IC1 - CS5361 (Cirrus Logic)
- IC3 - TLE2426 (Texas Instruments)
Discrete Semiconductors:
- Q1 - STD2805T4 (STMicroelectronics)
- Q2/Q3 - BSS138 (ON Semiconductor)
- D1/D4 - BAT60JFILM (STMicroelectronics)
- D5 - PDS760-13 (Diodes Incorporated)
LEDs: The LEDs (e.g., ams-OSRAM LTRBR37G-4R4S) are also from reputable firms that generally comply with RoHS guidelines.
Other Notable Components:
- J4 - TYPE-C-31-M-12 (Korean Hroparts Elec)
- J7 - PJ-063AH (CUI Devices)
- SW1 - PTS815 SJM 250 (C&K)

Make sure to review the exact part numbers and manufacturers' datasheets or directly contact your component suppliers for confirmation of RoHS compliance status. Additionally, distributors like Digi-Key, Mouser, and others often list RoHS compliance information on their product pages.

Someone is typing...

please explain what U4 does.

caplzc

@copilot please explain what U4 does.

copilot

The component

U4

is an ADM812SARTZ-REEL, which is a microprocessor supervisory circuit. Its primary function is to monitor the power supply voltage to a microprocessor and ensure that the system operates correctly under all conditions. Here are the key functions:

Reset Output: $U4$ asserts a reset signal to the microprocessor during power-up, power-down, and brownout conditions. This ensures the processor starts in a known state. The reset output is connected to the microcontroller reset pin.
Manual Reset Input: It includes a manual reset function. If $U4$ detects a ground signal at the manual reset pin, it will force a reset output.
Voltage Monitoring: It monitors the supply voltage and will generate a reset pulse if the voltage drops below a predetermined threshold, ensuring that the microprocessor does not operate below a safe voltage.

In your schematic,

U4

is connected to power and ground through its VCC and GND pins. It uses the reset pin (~RESET) for outputting the reset signal. The ~MR pin allows for a manual reset input. This setup protects your microprocessor from unexpected behavior or data corruption during voltage fluctuations or power interruptions.

Someone is typing...

recommend a replacement for C24.

psychobabble

@copilot recommend a replacement for C24.

copilot

To recommend a replacement for the capacitor

C24

, let's consider its specifications:

Capacitance: 330 µF

When choosing a replacement capacitor, you should ensure that the capacitance value matches. If possible, it's also recommended to match the voltage rating and consider tolerance, ESR, and package size depending on your circuit's requirements.

For a typical use case, the following capacitor series might be suitable replacements:

Panasonic EEU-FC Series: Known for their low ESR and high reliability, ideal for general-purpose applications.
Nichicon PW Series: Offer good performance for a variety of applications with low impedance characteristics.
KEMET ALS30 Series: These are good for high ripple current applications, durable for demanding environments.

Ensure the selected replacement capacitor fits your application in terms of voltage rating and physical dimensions. Let me know if your application has specific requirements, and I can make more targeted suggestions!

lebaduelic

This is a very general suggestion. Which part from Panasonic EEU-FC series do you suggest specifically?

10mo

copilot

To suggest a specific replacement for C24 from the Panasonic EEU-FC series, we need to consider the following specifications:

Capacitance: 330 µF
Voltage Rating: Match the original or as per your circuit requirements
Mounting Type: Typically radial

Here is a specific recommendation from the Panasonic EEU-FC series:

Part Number: EEU-FC1J331
- Capacitance: 330 µF
- Voltage Rating: 63V
- Package Type: Radial
- Temperature Range: -40°C to 105°C

This is a general-purpose capacitor with a higher voltage rating, providing extra headroom for voltage spikes. Make sure that the physical size of the capacitor fits your PCB design. If your circuit's operating voltage is lower, you may choose a variant with a lower voltage rating to better match your requirements.

10mo

Someone is typing...

verify that all passive components have an appropriate voltage ratings.

jharwinflux

@copilot verify that all passive components have an appropriate voltage ratings.

copilot

To verify the appropriate voltage ratings for all passive components in the project, we'll need to check the operating voltages present in the circuit and then compare these to the voltage ratings of each passive component. Here are the steps we'll follow:

Identify Operating Voltages: We have different power net labels like +3V3, +5VA, +12V, AVDD, and PVDD. We'll assume typical values for these as follows:
- +3V3: 3.3V
- +5VA: 5V
- +12V: 12V
- AVDD: 3.3V (usually analog supply similar to I/O voltage)
- PVDD: 3.3V (typically, power supply voltage)
Check Capacitors: We'll ensure that the voltage rating for capacitors is at least 1.5 times the highest operating voltage they may encounter. Typical voltage ratings for capacitors can be 16V, 25V, or higher.
Check Resistors: Resistors generally have much higher voltage ratings for their standard applications, but we'll still verify to ensure no specific low-voltage applications.

Assuming the projections of typical use here, I'll list the capacitors and resistors along with their required voltage ratings:

Capacitors:

C1 to C99 (all capacitors): Typically, capacitors should have voltage ratings at least 1.5 times the maximum voltage they may encounter. Given the highest voltage is +12V:
- Ensure voltage rating >= 18V (for safety, prefer 25V or higher)

Resistors:

R1 to R76 (all resistors): Resistors typically have voltage ratings far higher than typical operating voltages (somewhere well above 50V for standard resistors).

Verification:

Let's list all passive components and provide a general note confirming the voltage ratings, assuming we opt for conservative and safe ratings in actual design, which is common practice.

I'll summarize this in a planned format:

Voltage Ratings:

Capacitors: Ensure all capacitors (C1 to C99) have voltage ratings of at least 25V.

For thorough checks:

Cross-check voltage ratings with design if available, or opt for common ratings:
- 16V, 25V, 50V (prefer 25V or 50V).
Resistors: Ensure all resistors (R1 to R76) can handle the standard operating conditions, but it's generally safe to assume they will if sourced from common 1/8 W, 1/4 W ratings which far exceed 12V in typical design.

Detailed Check:

For further validation, if values are available, verify specific rating details against component datasheets.

In summary, proper component selection should inherently ensure ratings safely exceed operating voltages. If specific capacitor voltage details or any suspicion exists of constraints, sourcing capacitors with conservative ratings (25V or preferred safe margins) validates their reliability.

If you have specific value ratings or a datasheet of passives, it would help to ensure exact verifications. But this conservative general guidance should suffice typically.

Would you like to proceed with further detailed values, or cross-check any particular items or values from your list?

Someone is typing...

check all my ICs for any missing decoupling capacitors. Flag any warnings and ma...

jharwinflux

@copilot check all my ICs for any missing decoupling capacitors. Flag any warnings and make suggestions.

copilot

For ICs, decoupling capacitors are typically placed close to power pins to filter out noise and stabilize the voltage supply. Let's go through each IC and check if there are any missing or inappropriate decoupling capacitors.

ICs to Check

ADAU1452 (U1):
- Pins: 2 $(IOVDD)$ , 3 $(VDRIVE)$ , 7 $(AVDD)$ , 15 $(PVDD)$ , 20 $(DVDD)$ , 35 $(DVDD)$ , 38 $(IOVDD)$ , 53 $(DVDD)$ , 56 $(IOVDD)$ , 71 $(DVDD)$ , 15 $(PVDD)$
- Needs decoupling caps on each power pin $(VDD, PVDD, AVDD, IOVDD, VDRIVE)$ .
OPA1612AID (U7, U8, U9, U10):
- Pins: 8 $(V+)$ , 4 $(V-)$
- Needs decoupling caps $(typically 0.1μF ceramic)$ on each power pin.
CH340C (IC5):
- Pins: 4 $(V3)$ , 16 $(VCC)$
- Needs decoupling caps on each power pin.
TLE2426CD (IC3):
- Pins: 1 $(OUT)$ , 3 $(IN)$
- Needs decoupling caps on the input.
LM1117MPX-3.3/NOPB (U5, U6):
- Pins: 3 $(VI)$ , 2 $(VO)$
- Needs decoupling caps on input and output.
ADM812SARTZ-REEL (U4):
- Pins: 4 $(VCC)$
- Needs a decoupling cap on the $(VCC)$ pin.
PCM1795DBR (U2):
- Pins: 9 $(VDD)$ , 15 $(VCC2R)$ , 21 $(VCC1)$ , 28 $(VCC2L)$
- Needs decoupling caps on each power pin.
ESP32-WROOM-32 (U3):
- Pins: 2 $(VDD)$
- Needs a decoupling cap on the $(VDD)$ pin.
CS5361 (IC1):
- Pins: 6 $(VD)$ , 8 $(VL)$ , 19 $(VA)$
- Needs decoupling caps on each power pin.
TCA6424ARGJR (U11):
- Pins: 27 $(V\_CCP)$ , 31 $(V\_CCI)$
- Needs decoupling caps on each power pin.

Current Capacitor Placement

Using the project schematic information, we will look for any decoupling capacitors connected to these power pins.

Verifications and Recommendations

ADAU1452 (U1):
- Existing:
  - VDD: Not mentioned
  - PVDD: Connected to C6
  - AVDD: Connected to C3
  - IOVDD: Multiple connections, likely sufficing other decoupling locations.
  - VDRIVE: R7 => Q1 => U1:VDRIVE $(suggest adding a capacitor here)$ .
- Recommendation: Ensure 0.1μF and 10μF capacitors close to each $(VDD, PVDD, AVDD, IOVDD, VDRIVE)$ .
OPA1612AID (U7, U8, U9, U10):
- Existing:
  - U7: V+ to +5VA via Net
  - U8: V+ to +5VA via Net
  - U9: V+ to +5VA via Net
  - U10: V+ to +5VA via Net
- Recommendation: Add 0.1μF ceramic capacitors close to V+ and V- pins of each OPA1612.
CH340C (IC5):
- Existing:
  - V3: Net 67 $(Connection needed to capacitor)$ .
  - VCC: Net 67 $(Ensure capacitor exists)$ .
- Recommendation: Add a 0.1μF ceramic capacitor close to each power pin.
TLE2426CD (IC3):
- Existing:
  - Noted input connections, but ensure decoupling capacitors.
- Recommendation: Add 10μF capacitor on IN pin.
LM1117MPX-3.3/NOPB (U5, U6):
- Existing:
  - All instances of the IC are connected but ensure capacitor placements.
- Recommendation: Add 10μF on input and 10μF on output close to the IC.
ADM812SARTZ-REEL (U4):
- Existing:
  - VCC connection observed.
- Recommendation: Add a 0.1μF capacitor close to the $(VCC)$ pin.
PCM1795DBR (U2):
- Existing:
  - Multiple capacitors noted, ensure each corresponds to power pins specifically.
- Recommendation: Add capacitors $(0.1μF and 10μF)$ close to $(VDD, VCC1, VCC2L, VCC2R)$ .
ESP32-WROOM-32 (U3):
- Existing:
  - VDD has connections to Net 67.
- Recommendation: Ensure 10μF and 0.1μF capacitors at $(VDD)$ pin.
CS5361 (IC1):
- Existing:
  - Multiple capacitors noted $(Net 9)$ .
- Recommendation: Ensure each $(VD, VL, VA)$ power pin has 0.1μF and 10μF capacitors.
TCA6424ARGJR (U11):
- Existing:
  - V_CCP connection observed.
- Recommendation: Add 0.1μF and 1μF capacitors close to $(V\_CCP and V\_CCI)$ power pins.

Summary of Recommendations

Confirm 0.1μF and 10μF capacitors are placed close to each IC power pin, especially for:
- U1 $(ADAU1452)$
- U2 $(PCM1795DBR)$
- U3 $(ESP32-WROOM-32)$
- U5, U6 $(LM1117MPX-3.3/NOPB)$
- U7, U8, U9, U10 $(OPA1612AID)$
- IC1 $(CS5361)$
- IC3 $(TLE2426CD)$
- IC5 $(CH340C)$
- U4 $(ADM812SARTZ-REEL)$
- U11 $(TCA6424ARGJR)$

Let me know if you need further specifics or confirmation details on other components/parts in the design!

Someone is typing...

SCL

ESP_EN

ESP_RX

SDA

ESP_IO0

ESP_TX

Reviews

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Project Name

Portable Audio DSP

Description

Portable Audio DSP project utilizing multiple ICs, capacitors, resistors, and LEDs for advanced audio processing and control. Designed for embedded audio applications with ESP32, ADC, DAC, and interface components. #audioDevices #DSP #ADC #audio #DAC

Properties

License

Pricing & Availability

Distributor	Qty 1
Arrow	$27.43–$34.61
Digi-Key	$20.38–$60.88
LCSC	$110.19–$110.81
Mouser	$65.83
TME	$34.50
Verical	$24.04–$30.84

Assets

Portable Audio DSP.png

Portable Audio DSPThumbnail

Controls

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vasy_skral / Portable Audio DSP

Schematic