# Signal Tracer ## Description Modern SMD recreation of the Nuova Elettronica LX750 analog curve tracer, with analog X/Y acquisition for RP2040 processing and a 4-inch SPI TFT display interface. ## Project Details - **Owner:** jurgen - **Created:** 7/27/2026 - **Last Updated:** 7/27/2026 - **Visibility:** Public - **Connectivity:** WiFi - **Power Requirements:** USB-C - **Domain:** Consumer IoT - **Operating Voltage:** 5V - **Connectivity:** Bluetooth ## Key Components ### ADC1 — [ADS8684](https://www.flux.ai/kicad-part-library/ads8684~9ez.md) - Role: Sensing (Shunt) - Manufacturer Part Number: ADS8684 - Role Details: Digitizes LX750 X/Y outputs after attenuation/protection; muxed ADC, not simultaneous sampling. - Package or Case Code: TSSOP-38_4.4x9.7mm_P0.5mm - Datasheet URL: http://www.ti.com/lit/ds/symlink/ads8688.pdf - Manufacturer Name: Texas Instruments Inc. **Pins:** - ~{CS} [pin 38] - ~{REFSEL} [pin 4] - ~{RST/PD} [pin 2] - AGND [pin 8] - AGND [pin 28] - AGND [pin 29] - AGND [pin 31] - AGND [pin 32] - AIN_0GND [pin 17] - AIN_0P [pin 16] - AIN_1GND [pin 19] - AIN_1P [pin 18] - AIN_2GND [pin 20] - AIN_2P [pin 21] - AIN_3GND [pin 22] - AIN_3P [pin 23] - AUX_GND [pin 11] - AUX_IN [pin 10] - AVDD [pin 30] - AVDD [pin 9] - DAISY [pin 3] - DGND [pin 33] - DNC [pin 35] - DVDD [pin 34] - NC [pin 14] - NC [pin 13] - NC [pin 25] - NC [pin 26] - NC [pin 24] - NC [pin 27] - NC [pin 15] - NC [pin 12] - REFCAP [pin 7] - REFGND [pin 6] - REFIO [pin 5] - SCLK [pin 37] - SDI [pin 1] - SDO [pin 36] ### D1 — [USBLC6-2SC6](https://www.flux.ai/lcsc/usblc6-2sc6~2e9x.md) - Role: Protection - Maximum Clamping Voltage: 17V - Power: 150W - Datasheet URL: https://www.lcsc.com/datasheet/C2687116.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNRTlhdUVdURFlXXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Role Details: Low-capacitance USB2 ESD array on USB D+/D- before RP2040. - Peak Pulse Current: 5A - Part Type: ESD Protection Devices - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL - Manufacturer Part Number: USBLC6-2SC6 - Symbol Style: parametric-v1 - JLCPCB Part Class: Extended Part - LCSC Part Number: C2687116 - Breakdown Voltage: 6V - Manufacturer Name: UMW(友台半导体) - Operating Temperature: -55°C ~ 125°C (TJ) **Pins:** - GND [pin 2] - I/O1 [pin 1] - I/O1 [pin 6] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### IC2 — [TL082CDT](https://www.flux.ai/jecstronic/tl082cdt~osh.md) - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/a1/13/87/67/ab/ad/4c/f9/CD00000492.pdf/files/CD00000492.pdf/jcr:content/translations/en.CD00000492.pdf - Manufacturer Part Number: TL082CDT - Role Details: LX750 IC2 TL082 SMD migration; exact feedback wiring to be manually traced. - Part Type: Operational Amplifier (OP-AMP) - Role: Amplification - Manufacturer Name: STMicroelectronics **Pins:** - -IN 1 [pin 2] - -IN 2 [pin 6] - +IN 1 [pin 3] - +IN 2 [pin 5] - OUTPUT 1 [pin 1] - OUTPUT 2 [pin 7] - V- [pin 4] - V+ [pin 8] ### IC3 — [CD4093BPWR](https://www.flux.ai/jecstronic/cd4093bpwr~pwd.md) - Part Type: Integrated Circuit - Role Details: LX750 IC3 CD4093 SMD migration for oscillator/control gates. - Role: Signal Generation - Manufacturer Name: Texas Instruments Inc. - Datasheet URL: https://www.ti.com/lit/ds/symlink/cd4093b.pdf - Manufacturer Part Number: CD4093BPWR - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 1] - B [pin 2] - C [pin 5] - D [pin 6] - E [pin 8] - F [pin 9] - G [pin 12] - H [pin 13] - J [pin 3] - K [pin 4] - L [pin 10] - M [pin 11] - VDD [pin 14] - VSS [pin 7] ### IC4 — [CD4040BM96](https://www.flux.ai/lcsc/cd4040bm96~8h7y.md) - Role: Signal Generation - LCSC Part Number: C353974 - Manufacturer Part Number: CD4040BM96 - Manufacturer Name: TI(德州仪器) - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Others_Texas-Instruments-TI-CD4040BM96_C353974.html - Package or Case Code: SOIC-16_L9.9-W3.9-P1.27-LS6.0-BL - Part Type: Counters / Dividers - Role Details: LX750 IC4 CD4040 SMD migration for stepped current/ramp DAC sequencing. - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1912111437_Texas-Instruments-CD4040BM96_C353974.pdf **Pins:** - ~{} [pin 10] - Q1 [pin 9] - Q10 [pin 14] - Q11 [pin 15] - Q12 [pin 1] - Q2 [pin 7] - Q3 [pin 6] - Q4 [pin 5] - Q5 [pin 3] - Q6 [pin 2] - Q7 [pin 4] - Q8 [pin 13] - Q9 [pin 12] - R [pin 11] - VDD [pin 16] - VSS [pin 8] ### IC6 — [LM311DR2G](https://www.flux.ai/lcsc/lm311dr2g~ldh8.md) - Role: Signal Generation - Manufacturer Part Number: LM311DR2G - Role Details: LX750 IC6 LM311 SMD migration; open-collector pull-up rail to be verified. - Package or Case Code: SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2210210200_onsemi-LM311DR2G_C231850.pdf - LCSC Part Number: C231850 - Product Info Url: https://lcsc.com/product-detail/Analog-Comparators_ON-Semicon_LM311DR2G_ON-Semicon-ON-LM311DR2G_C231850.html - JLCPCB Part Class: Extended Part - Part Type: Comparators - Manufacturer Name: onsemi(安森美) **Pins:** - 2 [pin 2] - 3 [pin 3] - 7 [pin 7] - BALANCE [pin 5] - BALANCE/STROBE [pin 6] - GND [pin 1] - VCC [pin 8] - VEE [pin 4] ### IC7 — [TL082CDT](https://www.flux.ai/jecstronic/tl082cdt~osh.md) - Part Type: Operational Amplifier (OP-AMP) - Role Details: LX750 IC7 TL082 SMD migration for X/Y conditioning; exact feedback wiring to be manually traced. - Manufacturer Part Number: TL082CDT - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/a1/13/87/67/ab/ad/4c/f9/CD00000492.pdf/files/CD00000492.pdf/jcr:content/translations/en.CD00000492.pdf - Role: Amplification - Manufacturer Name: STMicroelectronics **Pins:** - -IN 1 [pin 2] - -IN 2 [pin 6] - +IN 1 [pin 3] - +IN 2 [pin 5] - OUTPUT 1 [pin 1] - OUTPUT 2 [pin 7] - V- [pin 4] - V+ [pin 8] ### IC8 — [TL082CDT](https://www.flux.ai/jecstronic/tl082cdt~osh.md) - Role: Amplification - Manufacturer Name: STMicroelectronics - Manufacturer Part Number: TL082CDT - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/a1/13/87/67/ab/ad/4c/f9/CD00000492.pdf/files/CD00000492.pdf/jcr:content/translations/en.CD00000492.pdf - Role Details: LX750 IC8 TL082 SMD migration; exact feedback wiring to be manually traced. - Part Type: Operational Amplifier (OP-AMP) **Pins:** - -IN 1 [pin 2] - -IN 2 [pin 6] - +IN 1 [pin 3] - +IN 2 [pin 5] - OUTPUT 1 [pin 1] - OUTPUT 2 [pin 7] - V- [pin 4] - V+ [pin 8] ### J1 — [PJ-051AH](https://www.flux.ai/vasy_skral/pj-051ah~yy8.md) - Role Details: External isolated DC adapter input; avoids bulky mains transformer on board. - Part Type: Connector - Datasheet URL: https://www.cuidevices.com/product/resource/digikeypdf/pj-051ah.pdf - Manufacturer Part Number: PJ-051AH - Role: Power Conversion - Manufacturer Name: CUI Devices **Pins:** - Center Pin [pin 1] - MountPin [pin MP1] - MountPin [pin MP2] - Switch [pin 3] - Terminal [pin 2] ### J2 — [TSW-110-07-T-S](https://www.flux.ai/cherepanyadima/tsw-110-07-t-s~e2.md) - Role Details: Provisional 10-pin connector for 4-inch SPI TFT; final connector depends on display module pinout. - Manufacturer Name: Samtec - Role: Signal Generation - Datasheet URL: https://suddendocs.samtec.com/catalog_english/tsw_th.pdf - Manufacturer Part Number: TSW-110-07-T-S - Part Type: Connector **Pins:** - 01 [pin 01] - 02 [pin 02] - 03 [pin 03] - 04 [pin 04] - 05 [pin 05] - 06 [pin 06] - 07 [pin 07] - 08 [pin 08] - 09 [pin 09] - 10 [pin 10] ### J3 — [TSW-110-07-T-S](https://www.flux.ai/cherepanyadima/tsw-110-07-t-s~e2.md) - Manufacturer Name: Samtec - Role: Sensing (Shunt) - Role Details: Provisional connector for B/C/E and G/D/S DUT terminals; final switch matrix to be traced from LX750 schematic. - Part Type: Connector - Manufacturer Part Number: TSW-110-07-T-S - Datasheet URL: https://suddendocs.samtec.com/catalog_english/tsw_th.pdf **Pins:** - 01 [pin 01] - 02 [pin 02] - 03 [pin 03] - 04 [pin 04] - 05 [pin 05] - 06 [pin 06] - 07 [pin 07] - 08 [pin 08] - 09 [pin 09] - 10 [pin 10] ### J4 — [FTSH-103-01-L-DV](https://www.flux.ai/cherepanyadima/ftsh-103-01-l-dv~u9.md) - Role Details: SWD programming/debug header: SWDIO, SWCLK, GND, 3V3 plus spare pins. - Datasheet URL: https://suddendocs.samtec.com/catalog_english/ftsh_smt.pdf - Manufacturer Name: Samtec - Manufacturer Part Number: FTSH-103-01-L-DV - Role: Signal Generation - Part Type: Connector **Pins:** - 01 [pin 01] - 02 [pin 02] - 03 [pin 03] - 04 [pin 04] - 05 [pin 05] - 06 [pin 06] ### J5 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Role Details: USB-C USB2 device connector for RP2040 programming; self-powered data/bootloader port. - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: USB C - Symbol Style: parametric-v1 - Manufacturer Name: GCT - Manufacturer Part Number: USB4105-GF-A - Manufacturer Name: GCT - Role: Signal Generation **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1_B12] - GND__1 [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin SH1] - SHELL_GND__1 [pin SH2] - SHELL_GND__2 [pin SH3] - SHELL_GND__3 [pin SH4] - VBUS [pin A4_B9] - VBUS__1 [pin B4_A9] ### PS1 — [DPBW06F-15](https://www.flux.ai/adrian95/dpbw06f-15~pnm.md) - Part Type: Power Supply - Manufacturer Name: MEAN WELL USA Inc. - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/2289/SPBW06%2CDPBW06_Ds.pdf - Role: Power Conversion - Role Details: 9-36 V input to ±15 V, 200 mA/rail baseline for op-amp analog core; driver current still to be verified. - Manufacturer Part Number: DPBW06F-15 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - -VIN [pin 1] - -VOUT [pin 8] - +VIN [pin 2] - +VOUT [pin 6] - COMMON [pin 7] - NC [pin 5] - RC [pin 3] ### S1 — [FSM1LP](https://www.flux.ai/adrian95/fsm1lp.md) - Role Details: Momentary reset switch: RUN to GND. - Manufacturer Part Number: FSM1LP - Part Type: Electromechanical Components - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Catalog+Section%7F1308111-1_SWITCHES_CORE_PROGRAM_CATALOG%7F0308%7Fpdf%7FEnglish%7FENG_CS_1308111-1_SWITCHES_CORE_PROGRAM_CATALOG_0308.pdf%7F1-1437565-6 - Manufacturer Name: TE Connectivity - License: https://creativecommons.org/licenses/by/4.0/ - Role: Switching **Pins:** - COM_1 [pin 1] - COM_2 [pin 2] - GND [pin 5] - NO_1 [pin 3] - NO_2 [pin 4] ### S2 — [FSM1LP](https://www.flux.ai/adrian95/fsm1lp.md) - Role: Switching - Manufacturer Part Number: FSM1LP - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Catalog+Section%7F1308111-1_SWITCHES_CORE_PROGRAM_CATALOG%7F0308%7Fpdf%7FEnglish%7FENG_CS_1308111-1_SWITCHES_CORE_PROGRAM_CATALOG_0308.pdf%7F1-1437565-6 - Role Details: BOOTSEL switch pulls QSPI_CSN low while resetting to enter RP2040 USB bootloader. - Part Type: Electromechanical Components - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: TE Connectivity **Pins:** - COM_1 [pin 1] - COM_2 [pin 2] - GND [pin 5] - NO_1 [pin 3] - NO_2 [pin 4] ### U1 — [RP2040](https://www.flux.ai/vasy_skral/rp2040~kqt.md) - Part Type: Microcontroller - Role Details: Controls SPI ADC acquisition and 4-inch SPI TFT display rendering. - Symbol Style: Parametric - Datasheet URL: https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf - Manufacturer Part Number: RP2040 - Role: Signal Generation - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Raspberry Pi **Pins:** - ADC_AVDD [pin 43] - DVDD [pin 50] - DVDD [pin 23] - GND [pin 57] - GPIO0 [pin 2] - GPIO1 [pin 3] - GPIO10 [pin 13] - GPIO11 [pin 14] - GPIO12 [pin 15] - GPIO13 [pin 16] - GPIO14 [pin 17] - GPIO15 [pin 18] - GPIO16 [pin 27] - GPIO17 [pin 28] - GPIO18 [pin 29] - GPIO19 [pin 30] - GPIO2 [pin 4] - GPIO20 [pin 31] - GPIO21 [pin 32] - GPIO22 [pin 34] - GPIO23 [pin 35] - GPIO24 [pin 36] - GPIO25 [pin 37] - GPIO26/ADC0 [pin 38] - GPIO27/ADC1 [pin 39] - GPIO28/ADC2 [pin 40] - GPIO29/ADC3 [pin 41] - GPIO3 [pin 5] - GPIO4 [pin 6] - GPIO5 [pin 7] - GPIO6 [pin 8] - GPIO7 [pin 9] - GPIO8 [pin 11] - GPIO9 [pin 12] - IOVDD [pin 10] - IOVDD [pin 49] - IOVDD [pin 33] - IOVDD [pin 1] - IOVDD [pin 22] - IOVDD [pin 42] - QSPI_CSN [pin 56] - QSPI_SCLK [pin 52] - QSPI_SD0 [pin 53] - QSPI_SD1 [pin 55] - QSPI_SD2 [pin 54] - QSPI_SD3 [pin 51] - RUN [pin 26] - SWCLK [pin 24] - SWD [pin 25] - TESTEN [pin 19] - USB_DM [pin 46] - USB_DP [pin 47] - USB_VDD [pin 48] - VREG_VIN [pin 44] - VREG_VOUT [pin 45] - XIN [pin 20] - XOUT [pin 21] ### U2 — [W25Q16JWSNIQ TR](https://www.flux.ai/lcsc/w25q16jwsniq-tr~ea8o.md) - Manufacturer Part Number: W25Q16JWSNIQ TR - Role: Memory - Manufacturer Name: WINBOND(华邦) - LCSC Part Number: C2595079 - Role Details: 16 Mbit QSPI boot flash for RP2040 QSPI interface. - Package or Case Code: SOIC-8_L5.0-W4.0-P1.27-LS6.1-BL - JLCPCB Part Class: Extended Part **Pins:** - ~{CS} [pin 1] - CLK [pin 6] - DI(IO0) [pin 5] - DO(IO1) [pin 2] - GND [pin 4] - HOLD#orRESET#(IO3) [pin 7] - VCC [pin 8] - WP#(IO2) [pin 3] ### Y1 — [12MHz Crystal Oscillator](https://www.flux.ai/collinsemasi/12mhz-crystal-oscillator~wc.md) - Manufacturer Name: YXC - Manufacturer Part Number: X322512MSB4SI - Part Type: Resonator - Role: Timing - Datasheet URL: https://datasheet.lcsc.com/lcsc/2304140030_YXC-X322512MSB4SI_C9002.pdf - Role Details: 12 MHz RP2040 XOSC crystal; library part is 20 pF CL, load caps adjusted provisionally. **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/jurgen/signal-tracer~m5](https://www.flux.ai/jurgen/signal-tracer~m5).* --- *Generated from [https://www.flux.ai/jurgen/signal-tracer~m5](https://www.flux.ai/jurgen/signal-tracer~m5)*