# Stereo DSP Amplifier ## Description 150 mm × 150 mm four-layer stereo DSP amplifier with balanced TRS inputs, INA1650 receiver, PCM1863 ADC, ESP32-S3 real-time I²S DSP, TAS5825M Class-D output, 18 V input power, protection, and test points. ## Project Details - **Owner:** auralisp - **Created:** 7/25/2026 - **Last Updated:** 7/25/2026 - **Visibility:** Public - **Copies:** 1 ## Key Components ### D1 — [SMBJ24A](https://www.flux.ai/cherepanyadima/smbj24a~2b.md) - Datasheet URL: https://services.taiwansemi.com/storage/resources/datasheet/SMBJ%20SERIES_R2104.pdf - Role: TVS Protection - Role Details: 24V standoff TVS on protected 18V input rail - Part Type: TVS - Manufacturer Part Number: SMBJ24A-TR - Manufacturer Name: Taiwan Semiconductor Corporation **Pins:** - A [pin 2] - K [pin 1] ### D2 — [PESD15VS2UT,215](https://www.flux.ai/lcsc/pesd15vs2utc215~r71i.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Nexperia-PESD15VS2UT-215_C282556.pdf - Part Type: ESD Protection Devices - Role Details: 15V two-line ESD protection for TRS hot/cold audio lines - Role: ESD Protection - JLCPCB Part Class: Extended Part - Package or Case Code: SOT-23_L2.9-W1.3-P1.90-LS2.4-BR - Manufacturer Name: Nexperia(安世) - Manufacturer Part Number: PESD15VS2UT,215 - Product Info Url: https://lcsc.com/product-detail/Others_Nexperia_PESD15VS2UT-215_Nexperia-PESD15VS2UT-215_C282556.html - LCSC Part Number: C282556 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### D3 — [PESD15VS2UT,215](https://www.flux.ai/lcsc/pesd15vs2utc215~r71i.md) - Package or Case Code: SOT-23_L2.9-W1.3-P1.90-LS2.4-BR - Role Details: 15V two-line ESD protection for TRS hot/cold audio lines - Manufacturer Name: Nexperia(安世) - Role: ESD Protection - Manufacturer Part Number: PESD15VS2UT,215 - Product Info Url: https://lcsc.com/product-detail/Others_Nexperia_PESD15VS2UT-215_Nexperia-PESD15VS2UT-215_C282556.html - LCSC Part Number: C282556 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Nexperia-PESD15VS2UT-215_C282556.pdf - Part Type: ESD Protection Devices - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### F1 — [2920L500/30GR](https://www.flux.ai/adrian95/2920l50030gr~cpa.md) - Role: Protection - LCSC Part Number: C19078763 - Part Type: Fuse - Manufacturer Part Number: 2920L500/30GR - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/C19078763.pdf - Manufacturer Name: LUTE - Role Details: 30V 5A hold resettable PTC for future 18V 5A adapter path **Pins:** - P1 [pin 1] - P2 [pin 2] ### FB1 — [Generic Inductor](https://www.flux.ai/jharwinbarrozo/generic-inductor~wlv.md) - Current Rating: 500mA - Role Details: Isolates PCM1863 AVDD from noisy 3.3V digital/ESP32 rail - Package: SMD_0603_1608Metric - Part Type: Inductor - Role: Power Filtering - Inductance: Ferrite bead 600Ω@100MHzH **Pins:** - P1 [pin 1] - P2 [pin 2] ### J1 — [NRJ6HF-1-AU](https://www.flux.ai/adrian95/nrj6hf-1-au~cu7.md) - Role Details: Left input: Tip=Hot+, Ring=Cold-, Sleeve=chassis/shield - Manufacturer Name: Neutrik - Part Type: Connector - Role: Balanced TRS Input - Package or Case Code: NRJ6HF1AU - Datasheet URL: https://www.neutrik.com/en/product/nrj6hf-1-au.pdf - Manufacturer Part Number: NRJ6HF-1-AU - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - G1 [pin G1] - MH1 [pin MH1] - R1 [pin R1] - RN1 [pin RN1] - S1 [pin S1] - T1 [pin T1] - TN1 [pin TN1] ### J10 — [Pin Header 01x04 2.54mm](https://www.flux.ai/vasyl/pin-header-01x04-254mm~de3.md) - Role: Impedance Matching - Part Type: Connector - Role Details: 4-pin jumper selector: common to INA input, selectable 0dB / -10dB / -18dB pad path; use one shunt position only **Pins:** - Pin_1 - Pin_2 - Pin_3 - Pin_4 ### J2 — [NRJ6HF-1-AU](https://www.flux.ai/adrian95/nrj6hf-1-au~cu7.md) - Manufacturer Part Number: NRJ6HF-1-AU - Datasheet URL: https://www.neutrik.com/en/product/nrj6hf-1-au.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Right input: Tip=Hot+, Ring=Cold-, Sleeve=chassis/shield - Package or Case Code: NRJ6HF1AU - Role: Balanced TRS Input - Part Type: Connector - Manufacturer Name: Neutrik **Pins:** - G1 [pin G1] - MH1 [pin MH1] - R1 [pin R1] - RN1 [pin RN1] - S1 [pin S1] - T1 [pin T1] - TN1 [pin TN1] ### J3 — [PJ-102AH](https://www.flux.ai/adrian95/pj-102ah~stl.md) - Part Type: Connector - Role: DC Input - Datasheet URL: https://www.cuidevices.com/product/resource/pj-102ah.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: 5.5 x 2.1/2.0 mm DC barrel input, 18V 5A rated connector - Manufacturer Part Number: PJ-102AH - Manufacturer Name: CUI Devices **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### J4 — [KF301-2P](https://www.flux.ai/adrian95/kf301-2p~rhx.md) - Part Type: Connector - Role Details: Left BTL speaker output; neither terminal is ground - Manufacturer Name: Handson Technology - Manufacturer Part Number: KF301-2P - Datasheet URL: https://www.handsontec.com/dataspecs/terminal%20block-5mm.pdf - Role: Speaker Terminal - Package or Case Code: HANDSON_KF301-2P - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] ### J5 — [KF301-2P](https://www.flux.ai/adrian95/kf301-2p~rhx.md) - Role Details: Right BTL speaker output; neither terminal is ground - Role: Speaker Terminal - Package or Case Code: HANDSON_KF301-2P - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: KF301-2P - Manufacturer Name: Handson Technology - Part Type: Connector - Datasheet URL: https://www.handsontec.com/dataspecs/terminal%20block-5mm.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### J6 — [TSW-106-07-G-S](https://www.flux.ai/adrian95/tsw-106-07-g-s~giw.md) - Part Type: Connector - Connector Type: Headers and Wire Housings - Role Details: 3V3/GND/UART0/BOOT/RESET bring-up header - Manufacturer Name: Samtec - Manufacturer Part Number: TSW-106-07-G-S - Role: Programming Header - Connector Rows: 1 - Connector Positions: 6 - Datasheet URL: https://suddendocs.samtec.com/catalog_english/tsw_th.pdf - Connector Gender: Male - License: https://creativecommons.org/licenses/by/4.0/ - Connector Pitch: 2.54mm **Pins:** - 01 [pin 01] - 02 [pin 02] - 03 [pin 03] - 04 [pin 04] - 05 [pin 05] - 06 [pin 06] ### J7 — [Pin Header 01x04 2.54mm](https://www.flux.ai/vasyl/pin-header-01x04-254mm~de3.md) - Role: Impedance Matching - Role Details: 4-pin jumper selector: common to INA input, selectable 0dB / -10dB / -18dB pad path; use one shunt position only - Part Type: Connector **Pins:** - Pin_1 - Pin_2 - Pin_3 - Pin_4 ### J8 — [Pin Header 01x04 2.54mm](https://www.flux.ai/vasyl/pin-header-01x04-254mm~de3.md) - Part Type: Connector - Role Details: 4-pin jumper selector: common to INA input, selectable 0dB / -10dB / -18dB pad path; use one shunt position only - Role: Impedance Matching **Pins:** - Pin_1 - Pin_2 - Pin_3 - Pin_4 ### J9 — [Pin Header 01x04 2.54mm](https://www.flux.ai/vasyl/pin-header-01x04-254mm~de3.md) - Role Details: 4-pin jumper selector: common to INA input, selectable 0dB / -10dB / -18dB pad path; use one shunt position only - Part Type: Connector - Role: Impedance Matching **Pins:** - Pin_1 - Pin_2 - Pin_3 - Pin_4 ### Q1 — [DMP3013SFV](https://www.flux.ai/kicad-part-library/dmp3013sfv~5bo.md) - Role: Reverse Polarity Protection - Package or Case Code: Diodes_PowerDI3333-8 - Manufacturer Part Number: DMP3013SFV - Datasheet URL: https://www.diodes.com/assets/Datasheets/DMP3013SFV.pdf - Role Details: Low RDS(on) P-channel MOSFET for 18V 5A input reverse-polarity protection **Pins:** - D [pin 5] - G [pin 4] - S [pin 1] - S [pin 3] - S [pin 2] ### SW1 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - Product Info Url: https://lcsc.com/product-detail/Tactile-Switches_XUNPU-TS-1088-AR02016_C720477.html - LCSC Part Number: C720477 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - Manufacturer Name: XUNPU(讯普) - JLCPCB Part Class: Extended Part - Role Details: Momentary pull-down on ESP32 EN/RESET net - Role: Reset Button - Package or Case Code: SW-SMD_L3.9-W3.0-P4.45 - Part Type: Tactile Switches - Manufacturer Part Number: TS-1088-AR02016 **Pins:** - 1 [pin 1] - 2 [pin 2] ### SW2 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - Part Type: Tactile Switches - Manufacturer Part Number: TS-1088-AR02016 - Package or Case Code: SW-SMD_L3.9-W3.0-P4.45 - Role: Boot Button - JLCPCB Part Class: Extended Part - Manufacturer Name: XUNPU(讯普) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - Role Details: Momentary pull-down on ESP32 GPIO0 for download mode - Product Info Url: https://lcsc.com/product-detail/Tactile-Switches_XUNPU-TS-1088-AR02016_C720477.html - LCSC Part Number: C720477 **Pins:** - 1 [pin 1] - 2 [pin 2] ### TP1 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role: Test Point - Testpoint Size: 0.5 - Part Type: Test Point - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT **Pins:** - P1 [pin 1] ### TP10 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Part Type: Test Point - Role: Test Point - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Testpoint Size: 0.5 **Pins:** - P1 [pin 1] ### TP11 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Testpoint Size: 0.5 - Role: Test Point - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Part Type: Test Point **Pins:** - P1 [pin 1] ### TP12 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role: Test Point - Testpoint Size: 0.5 - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Part Type: Test Point **Pins:** - P1 [pin 1] ### TP13 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role: Test Point - Testpoint Size: 0.5 - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Part Type: Test Point **Pins:** - P1 [pin 1] ### TP14 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Testpoint Size: 0.5 - Role: Test Point - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Part Type: Test Point **Pins:** - P1 [pin 1] ### TP2 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Testpoint Size: 0.5 - Role: Test Point - Part Type: Test Point **Pins:** - P1 [pin 1] ### TP3 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Testpoint Size: 0.5 - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Part Type: Test Point - Role: Test Point **Pins:** - P1 [pin 1] ### TP4 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Part Type: Test Point - Testpoint Size: 0.5 - Role: Test Point - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT **Pins:** - P1 [pin 1] ### TP5 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Role: Test Point - Testpoint Size: 0.5 - Part Type: Test Point **Pins:** - P1 [pin 1] ### TP6 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Part Type: Test Point - Role: Test Point - Testpoint Size: 0.5 **Pins:** - P1 [pin 1] ### TP7 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Role: Test Point - Part Type: Test Point - Testpoint Size: 0.5 **Pins:** - P1 [pin 1] ### TP8 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role: Test Point - Part Type: Test Point - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Testpoint Size: 0.5 **Pins:** - P1 [pin 1] ### TP9 — [Generic Testpoint](https://www.flux.ai/jharwinbarrozo/generic-testpoint~esx.md) - Role Details: Bring-up test point for rails, I2S, I2C, RESET, and FAULT - Role: Test Point - Testpoint Size: 0.5 - Part Type: Test Point **Pins:** - P1 [pin 1] ### U1 — [INA1650IPWR](https://www.flux.ai/lcsc/ina1650ipwr~ckji.md) - LCSC Part Number: C553130 - Product Info Url: https://lcsc.com/product-detail/Video-Audio-Interface-ICs_Texas-Instruments-Texas-Instruments-INA1650IPWR_C553130.html - Manufacturer Name: TI(德州仪器) - Role: Balanced Line Receiver - Part Type: Video-Audio Interface ICs - Allow Substitutes: No - Role Details: INA1650IPWR fixed major component; converts balanced TRS L/R to single-ended ADC inputs - Package or Case Code: TSSOP-14_L5.0-W4.4-P0.65-LS6.4-BL - Manufacturer Part Number: INA1650IPWR - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2005211036_Texas-Instruments-INA1650IPWR_C553130.pdf - JLCPCB Part Class: Extended Part **Pins:** - COMA [pin 3] - COMB [pin 6] - IN-A [pin 4] - IN-B [pin 5] - IN+A [pin 2] - IN+B [pin 7] - OUTA [pin 13] - OUTB [pin 8] - REFA [pin 12] - REFB [pin 9] - VCC [pin 1] - VEE [pin 14] - VMID(IN) [pin 11] - VMID(OUT) [pin 10] ### U2 — [PCM1863DBT](https://www.flux.ai/lcsc/pcm1863dbt~wrc8.md) - Package or Case Code: TSSOP-30_L7.8-W4.4-P0.50-LS6.4-BL - Datasheet URL: https://www.ti.com/lit/ds/symlink/pcm1863.pdf - Allow Substitutes: No - Role Details: PCM1863DBT fixed major component; 48 kHz 24-bit stereo ADC, I2S slave - LCSC Part Number: C1520794 - JLCPCB Part Class: Extended Part - Manufacturer Name: TI(德州仪器) - Manufacturer Part Number: PCM1863DBT - Role: Audio ADC **Pins:** - AGND [pin 7] - AVDD [pin 8] - BCK [pin 17] - DGND [pin 12] - DOUT [pin 18] - DVDD [pin 13] - INT [pin 19] - IOVDD [pin 14] - LDO [pin 11] - LRCK [pin 16] - MD0 [pin 26] - MD1 [pin 25] - MD2 [pin 23] - MD3 [pin 24] - MD4 [pin 22] - MD5 [pin 21] - MD6 [pin 20] - MicBias [pin 5] - SCKI [pin 15] - VINL1/VIN1P [pin 3] - VINL2/VIN1M [pin 1] - VINL3/VIN4P [pin 29] - VINL4/VIN4M [pin 27] - VINR1/VIN2P [pin 4] - VINR2/VIN2M [pin 2] - VINR3/VIN3P [pin 30] - VINR4/VIN3M [pin 28] - VREF [pin 6] - XI [pin 10] - XO [pin 9] ### U3 — [ESP32-S3-WROOM-1-N16R8](https://www.flux.ai/adrian95/esp32-s3-wroom-1-n16r8~fs1.md) - Part Type: Module - Manufacturer Part Number: ESP32-S3-WROOM-1-N16R8 - Manufacturer Name: Espressif Systems - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: parametric-v1 - Role Details: ESP32-S3-WROOM-1-N16R8 fixed major component; I2S clock master, DSP, Wi-Fi control - Role: DSP MCU Module - Allow Substitutes: No - Datasheet URL: https://www.mouser.com/datasheet/2/891/esp32_s3_wroom_1_wroom_1u_datasheet_en-2930317.pdf **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND_1 [pin 1] - GND_10 [pin 48] - GND_11 [pin 49] - GND_2 [pin 40] - GND_3 [pin 41] - GND_4 [pin 42] - GND_5 [pin 43] - GND_6 [pin 44] - GND_7 [pin 45] - GND_8 [pin 46] - GND_9 [pin 47] - IO0 [pin 27] - IO1 [pin 39] - IO10 [pin 18] - IO11 [pin 19] - IO12 [pin 20] - IO13 [pin 21] - IO14 [pin 22] - IO15 [pin 8] - IO16 [pin 9] - IO17 [pin 10] - IO18 [pin 11] - IO19 [pin 13] - IO2 [pin 38] - IO20 [pin 14] - IO21 [pin 23] - IO3 [pin 15] - IO35 [pin 28] - IO36 [pin 29] - IO37 [pin 30] - IO38 [pin 31] - IO39 [pin 32] - IO4 [pin 4] - IO40 [pin 33] - IO41 [pin 34] - IO42 [pin 35] - IO45 [pin 26] - IO46 [pin 16] - IO47 [pin 24] - IO48 [pin 25] - IO5 [pin 5] - IO6 [pin 6] - IO7 [pin 7] - IO8 [pin 12] - IO9 [pin 17] - RXD0 [pin 36] - TXD0 [pin 37] ### U4 — [TAS5825MRHBR](https://www.flux.ai/adrian95/tas5825mrhbr~s30.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Role Details: TAS5825MRHBR fixed major component; stereo BTL Class-D output, 18V PVDD - Package or Case Code: QFN50P500X500X100-33N-D - Manufacturer Part Number: TAS5825MRHBR - Manufacturer Name: Texas Instruments - Role: Class-D Amplifier - Allow Substitutes: No - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftas5825m **Pins:** - ~PDN [pin 17] - ADR [pin 8] - AGND [pin 20] - AVDD [pin 19] - BST_A- [pin 29] - BST_A+ [pin 1] - BST_B- [pin 28] - BST_B+ [pin 24] - DGND [pin 5] - DVDD [pin 6] - EPAD [pin 33] - GPIO0 [pin 9] - GPIO1 [pin 10] - GPIO2 [pin 11] - GVDD [pin 18] - LRCLK [pin 12] - OUT_A- [pin 30] - OUT_A+ [pin 2] - OUT_B- [pin 27] - OUT_B+ [pin 23] - PGND_1 [pin 25] - PGND_2 [pin 26] - PGND_3 [pin 31] - PGND_4 [pin 32] - PVDD_1 [pin 3] - PVDD_2 [pin 4] - PVDD_3 [pin 21] - PVDD_4 [pin 22] - SCL [pin 16] - SCLK [pin 13] - SDA [pin 15] - SDIN [pin 14] - VR_DIG [pin 7] ### U5 — [TPS54302DDCT](https://www.flux.ai/vasyl/tps54302ddct~cps.md) - Manufacturer Part Number: TPS54302DDCT - Role: Buck Regulator - Role Details: 3.3V digital rail sized for ESP32 Wi-Fi peaks plus audio IC digital loads; budget target >=1A peak - Part Type: Integrated Circuit - Datasheet URL: https://www.ti.com/lit/gpn/TPS54302 - Manufacturer Name: Texas Instruments **Pins:** - BOOT [pin 6] - EN [pin 5] - FB [pin 4] - GND [pin 1] - SW [pin 2] - VIN [pin 3] ### U6 — [TPS7A4901DGNR](https://www.flux.ai/adrian95/tps7a4901dgnr~0la.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Datasheet URL: http://www.ti.com/lit/ds/sbvs121b/sbvs121b.pdf - Integrated Circuit Type: Power Management - Manufacturer Part Number: TPS7A4901DGNR - Role: Analog LDO - Role Details: 12V low-noise analog rail for INA1650 headroom; support component chosen from library - Manufacturer Name: Texas Instruments **Pins:** - DNC [pin 7] - EN [pin 5] - EP [pin 9] - FB [pin 2] - GND [pin 4] - IN [pin 8] - NC [pin 3] - NR/SS [pin 6] - OUT [pin 1] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/auralisp/stereo-dsp-amplifier~x0](https://www.flux.ai/auralisp/stereo-dsp-amplifier~x0).* --- *Generated from [https://www.flux.ai/auralisp/stereo-dsp-amplifier~x0](https://www.flux.ai/auralisp/stereo-dsp-amplifier~x0)*