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1. 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.
2. 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)
3. Discrete Semiconductors:
   • Q1 - STD2805T4 (STMicroelectronics)
   • Q2/Q3 - BSS138 (ON Semiconductor)
   • D1/D4 - BAT60JFILM (STMicroelectronics)
   • D5 - PDS760-13 (Diodes Incorporated)
4. LEDs: The LEDs (e.g., ams-OSRAM LTRBR37G-4R4S) are also from reputable firms that generally comply with RoHS guidelines.
5. Other Notable Components:
   • J4 - TYPE-C-31-M-12 (Korean Hroparts Elec)
   • J7 - PJ-063AH (CUI Devices)
   • SW1 - PTS815 SJM 250 (C&K)

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• 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.

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• Capacitance: 330 µF

• 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.

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1. 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)
2. 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.
3. 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.

• 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)

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

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

• 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.

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

1. 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 $(VDD, PVDD, AVDD, IOVDD, VDRIVE)$.
2. 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.
3. 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.
4. TLE2426CD (IC3):
   • Existing:
     • Noted input connections, but ensure decoupling capacitors.
   • Recommendation: Add 10μF capacitor on IN pin.
5. 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.
6. ADM812SARTZ-REEL (U4):
   • Existing:
     • VCC connection observed.
   • Recommendation: Add a 0.1μF capacitor close to the $(VCC)$ pin.
7. PCM1795DBR (U2):
   • Existing:
     • Multiple capacitors noted, ensure each corresponds to power pins specifically.
   • Recommendation: Add capacitors $(0.1μF and 10μF)$ close to $(VDD, VCC1, VCC2L, VCC2R)$.
8. ESP32-WROOM-32 (U3):
   • Existing:
     • VDD has connections to Net 67.
   • Recommendation: Ensure 10μF and 0.1μF capacitors at $(VDD)$ pin.
9. CS5361 (IC1):
   • Existing:
     • Multiple capacitors noted $(Net 9)$.
   • Recommendation: Ensure each $(VD, VL, VA)$ power pin has 0.1μF and 10μF capacitors.
10. TCA6424ARGJR (U11):
    • Existing:
      • V_CCP connection observed.
    • Recommendation: Add 0.1μF and 1μF capacitors close to $(V\_CCP and V\_CCI)$ power pins.

• 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 $(TCA6424ARGJR)$