Power Net Review and Wiring

P

pjwjanssen

Review and wire the power nets in this design. Ensure all VCC, VDD, GND, and other power pins are properly connected to the correct power rails. Identify any power pins that are currently unconnected and connect them appropriately.

flux

I’ll inspect the schematic/netlist for unconnected power pins, map each IC/module power pin to the intended rails, apply the needed wiring fixes, then run validation to catch remaining power/ERC issues.

flux

Initial inspection found the IC supply pins already assigned to the expected rails; I’m making one focused power-net cleanup pass on rail metadata and the relay coil return so the power intent is explicit.

flux

Power-net review and wiring cleanup is complete. I marked the main rails as Power/Ground, verified U1/U2/U3/U4/U5 supply pins are connected to their expected rails, and connected K1/K2 relay coil NEG return to AGND.
Open items:
  • K1/K2 relay coils are now tied from +5V_RELAY to AGND, so they will be continuously energized unless you intended to add switching control.
Suggested next steps:
  1. Add transistor/MCU relay drivers if the relays should be controllable.
  2. Review decoupling capacitor placement near each IC power pin.
  3. Proceed with layout/routing checks for the updated power nets.
Add drivers and checks
Add relay drivers
Check decoupling placement
Run layout checks
Verify power architecture
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Schematic

Layout

Preview

Schematic Bring-up Notes — First Pass
Current architecture decision
The NJW1191/NJW1194 analog tone-control branch has been replaced by the ADAU1701 DSP tone module as the primary and only tone-control path. The premium analog volume stage remains the MUSES72320.
Current intended signal path:
Input RCA → OPA2134 input buffer → ADAU1701 DSP EQ/tone/loudness/crossover → MUSES72320 analog volume control → OPA2134 output buffer → Output RCA
What was captured
  • Project renamed to Modular High-End Audio Preamp.
  • First-pass modular schematic structure added for:
    • OPA2134 input buffer
    • ADAU1701 DSP tone path
    • MUSES72320 volume controller
    • OPA2134 output buffer
    • CH32V003 MCU control placeholder
    • RCA L/R input and output connectors
    • Initial decoupling capacitors and named power rails
Deprecated hardware
  • NJW1191/NJW1194 exact usable Flux library parts were not found.
  • The relay A/B selector path is no longer part of the intended design. K1 and K2 are marked excluded from BOM/PCB because direct component removal was blocked by a schematic graph issue.
  • Any remaining NJW placeholder nets should be ignored or cleaned in a future schematic hygiene pass; they are not part of the active intended signal path.
Important implementation notes
  • ADAU1701 support circuitry is incomplete. Required next items include clock/crystal, PLL loop filter, FILTA/FILTD/CM capacitors, ADC_RES resistor, ADC input coupling/scaling, reset/selfboot strapping, and 1.8 V regulator details.
  • MUSES72320 support circuitry is incomplete. Required next items include reference capacitors, zero-cross reference wiring, address/control strapping, and confirmation of analog/digital reference handling.
  • The MCU is a practical placeholder for control IO. Final selection may change depending on display, firmware ecosystem, and whether USB/Wi-Fi/Bluetooth are wanted.
Review state
A first ERC pass has been run. Remaining warnings are expected for the incomplete DSP/MUSES support circuits and deprecated selector/placeholder remnants. These should be resolved during the next schematic refinement pass before PCB layout.

  • Current architecture decision

  • What was captured

  • Deprecated hardware

  • Important implementation notes

  • Review state