Project Echo Schematic Design

flux

0:05

Work done
  • Created a high-level modular schematic for Project Echo with the main blocks: U1, U2, U3, U4, U5, U6, U7, U8, U9, U10, J1, and J2
  • Captured the top-level architecture in the project metadata and added project-level documentation for power requirements, connectivity, implementation scope, and naming conventions
  • Wired and labeled the core requirement nets: 12V, 5V, 3V3, GND, SPI_SCK, SPI_MOSI, SPI_MISO, RFID_RST, RFID1_SS, RFID2_SS, RFID3_SS, RFID4_SS, AUDIO_MODE_SEL, BT_L, BT_R, CHAR_L, CHAR_R, AMP_IN_L, and AMP_IN_R
  • Documented the Teensy control-pin assignment on U1, the Audio Shield placeholder assumptions on U2, the Bluetooth source assumptions on U7, the source-selection behavior on U8, the amplifier I/O boundary on U9, and the power-block scope on U10
  • Submitted a library coverage request for the Teensy Audio Shield Rev D because the current library entry is not usable as a schematic-level module
Success criteria review
  • ✅ All core system elements and interfaces are defined and documented in a requirements checklist
  • ✅ The schematic is partitioned into modular blocks with clearly labeled power rails and interconnections
  • ✅ Documentation now supports hand-off into detailed schematic design, including assumptions and deferred implementation details
Next steps The next step is to convert this architecture schematic into a detailed implementation: real Teensy Audio Shield interface wiring, regulator support parts, amplifier support circuitry, protection, and decoupling. If you want, I can do that next.
Create requirements checklist
Define inter-block nets
Set modular blocks
Add key assumptions
Include acceptance checklist
21 days
Sign up to send
Bluetooth Module
U7 GND - U9 GND
U10 PADGND - U1 G_1
U10 PADGND - U1 G_1
U10 PADGND - U1 G_1
U10 PADGND - U1 G_1
U10 PADGND - U1 G_1
U10 PADGND - U1 G_1
U7 GND - U9 GND
U10 PADGND - U1 G_1
U10 SW - U1 5V
U2 LINEOUT_R - U8 4
U2 VDDD - U3 VCC
U1 6_ - U3 RST
U1 3V3 - U2 VDDIO
U8 5 - U9 LINP
U7 LINE_BN - U8 2
U1 11_ - U3 MOSI
U1 9_ - U4 SS/SDA/Rx
U8 7 - U9 RINP
U2 LINEOUT_L - U8 3
U1 11_ - U3 MOSI
U1 10_ - U3 SS/SDA/Rx
U2 VDDD - U3 VCC
U1 13_ - U3 SCK
U1 7_ - U6 SS/SDA/Rx
U1 12_ - U3 MISO/SCL/Tx
U1 13_ - U3 SCK
U9 PVCC - U9 AVCC
U2 LINEOUT_R - U8 4
U7 LINE/MIC_AP - U8 1
U1 13_ - U3 SCK
U8 7 - U9 RINP
U1 8_ - U5 SS/SDA/Rx
U1 6_ - U3 RST
U1 12_ - U3 MISO/SCL/Tx
U1 6_ - U3 RST
U1 32_ - U8 6
U1 3V3 - U2 VDDIO
U1 12_ - U3 MISO/SCL/Tx
U1 10_ - U3 SS/SDA/Rx
U1 11_ - U3 MOSI
U8 5 - U9 LINP
U2 LINEOUT_L - U8 3
U1 9_ - U4 SS/SDA/Rx
U2 VDDD - U3 VCC
U1 32_ - U8 6
RFID Reader
Stereo Source Selector
Stereo Amplifier
Audio Shield
RFID Reader
Main Controller
  • 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

Project Echo

Project Echo thumbnail
High-level modular schematic requirements for a Teensy 4.1 based RFID-triggered audio system with Bluetooth input, analog source selection, stereo amplification, and 12V to 5V power partitioning.

Properties

12V input rail feeds stereo amplifier directly and buck regulator input. Buck regulator creates 5V rail for controller-side power. Teensy 3V3 rail is distributed to RFID readers and SGTL5000 functional audio block. Common GND used across digital, analog, Bluetooth, and power blocks with star-ground intent.

Shared SPI bus from Teensy to four RFID readers using SPI_SCK, SPI_MOSI, SPI_MISO, and shared RFID_RST, with unique RFID1_SS through RFID4_SS chip selects. Audio sources BT_L/BT_R and CHAR_L/CHAR_R feed stereo switch controlled by AUDIO_MODE_SEL, then route as AMP_IN_L and AMP_IN_R to the amplifier.

Naming convention uses explicit rail and interface nets: 12V, 5V, 3V3, GND, SPI_SCK, SPI_MOSI, SPI_MISO, RFID_RST, RFID1_SS, RFID2_SS, RFID3_SS, RFID4_SS, AUDIO_MODE_SEL, BT_L, BT_R, CHAR_L, CHAR_R, AMP_IN_L, AMP_IN_R. TS3A5018 throw assignment and Bluetooth module supply rail remain flexible as long as source identity and rail partitioning remain explicit.

High-level requirements-capture schematic only. Uses module-level or functional placeholder blocks to define power partitioning, shared SPI RFID architecture, analog audio source routing, and amplifier interfaces. Detailed passives, protection, decoupling, exact Audio Shield implementation, and final Bluetooth module supply selection are intentionally deferred.

Diagram



  
    
  
  
    
  



""Power""


""Controller""


""RFID Subsystem""


""Audio Sources and Selection""


""Amplifier and Output""
























I2S and control

SPI SCK MOSI MISO RFID_RST RFID1_SS RFID2_SS RFID3_SS RFID4_SS

Shared SPI

Shared SPI

Shared SPI

BT_L BT_R

CHAR_L CHAR_R

AUDIO_MODE_SEL

AMP_IN_L AMP_IN_R
















12V Input
12V to node_5V Buck
12V Rail
5V Rail
3V3 Rail from Teensy
Teensy 4.1
Teensy Audio Shield
RFID Reader 1
RFID Reader 2
RFID Reader 3
RFID Reader 4
Bluetooth Stereo Receiver
TS3A5018 Stereo Switch
TPA3116D2 Stereo Amplifier
Left Speaker
Right Speaker

Pricing & Availability

Distributor

Qty 1

Controls