# Touchscreen Airband Scanner

## Description

Portable receive\-only 118–136\.975 MHz AM airband scanner with a 3\.5\-inch touchscreen, speaker, headphones, Bluetooth audio, USB\-C, and replaceable battery\.

## Project Details

- **Owner:** colinlongworth
- **Created:** 10/2/2026
- **Last Updated:** 10/2/2026
- **Visibility:** Public

## Key Components

### J1 — [USB4105\-GF\-A](https://flux.ai/adrian95/usb4105-gf-a~im9.md)

- Part Type: USB C
- Role: Protection
- License: https://creativecommons\.org/licenses/by/4\.0/
- Symbol Style: parametric\-v1
- Functional Group: IO J1 USB\-C
- Manufacturer Name: GCT
- Manufacturer Name: GCT
- Role Details: USB2 full speed receptacle only5V sink; no PD high voltage
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/c2c7fba82d64960d510c5688ccda39e92973a3ef64f0758ccd8dce8a07cbda76\.pdf
- Manufacturer Part Number: USB4105\-GF\-A

**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]

### Q1 — [MMBT3904LT1G](https://flux.ai/openpartlist/mmbt3904lt1g~s5.md)

- Manufacturer Part Number: MMBT3904LT1G
- Role Details: Cross\-coupled ESP auto\-download transistor
- Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/mmbt3904lt1\-d\.pdf
- Manufacturer Name: onsemi
- Part Type: Transistor
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: IO U2 USB Service
- Role: Switching

**Pins:**
- B [pin 1]
- C [pin 3]
- E [pin 2]

### Q2 — [MMBT3904LT1G](https://flux.ai/openpartlist/mmbt3904lt1g~s5.md)

- Role Details: Cross\-coupled ESP auto\-download transistor
- Role: Switching
- Manufacturer Part Number: MMBT3904LT1G
- Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/mmbt3904lt1\-d\.pdf
- Manufacturer Name: onsemi
- Part Type: Transistor
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: IO U2 USB Service

**Pins:**
- B [pin 1]
- C [pin 3]
- E [pin 2]

### U1 — [ESP32\-WROOM\-32E\-N4](https://flux.ai/lcsc/esp32-wroom-32e-n4~cokv.md)

- Product Info Url: https://lcsc\.com/product\-detail/WIFI\-Modules\_Espressif\-Systems\-ESP32\-WROOM\-32E\-4MB\_C701341\.html
- Operating Temperature: –40 \~ 85 °C
- Functional Group: MCU U1 Scanner Controller
- Package or Case Code: WIFI\-SMD\_ESP32\-WROOM\-32E
- Operating Voltage: 3\.0 \~ 3\.6 V
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410301607\_Espressif\-Systems\-ESP32\-WROOM\-32E\-N4\_C701341\.pdf
- Manufacturer Name: ESPRESSIF\(乐鑫\)
- Role Details: Classic Bluetooth A2DP source; touch UI; receiver scan control; internal flash memories
- Frequency: 2412 \~ 2484 MHz
- Role: Controller
- Manufacturer Part Number: ESP32\-WROOM\-32E\-N4
- LCSC Part Number: C701341
- JLCPCB Part Class: Extended Part
- Part Type: WiFi Modules

**Pins:**
- 3V3 [pin 2]
- EN [pin 3]
- GND [pin 38]
- GND [pin 15]
- GND [pin 39]
- GND [pin 1]
- IO0 [pin 25]
- IO12 [pin 14]
- IO13 [pin 16]
- IO14 [pin 13]
- IO15 [pin 23]
- IO16 [pin 27]
- IO17 [pin 28]
- IO18 [pin 30]
- IO19 [pin 31]
- IO2 [pin 24]
- IO21 [pin 33]
- IO22 [pin 36]
- IO23 [pin 37]
- IO25 [pin 10]
- IO26 [pin 11]
- IO27 [pin 12]
- IO32 [pin 8]
- IO33 [pin 9]
- IO34 [pin 6]
- IO35 [pin 7]
- IO4 [pin 26]
- IO5 [pin 29]
- NC [pin 17]
- NC [pin 32]
- NC [pin 19]
- NC [pin 21]
- NC [pin 20]
- NC [pin 22]
- NC [pin 18]
- RXD0 [pin 34]
- SENSOR\_VN [pin 5]
- SENSOR\_VP [pin 4]
- TXD0 [pin 35]

### U2 — [CP2102N\-A02\-GQFN24](https://flux.ai/lcsc/cp2102n-a02-gqfn24~cpln.md)

- Package or Case Code: QFN\-24\_L4\.0\-W4\.0\-P0\.50\-TL\-EP2\.5
- Part Type: Interface \- Controllers
- Functional Group: IO U2 USB Service
- LCSC Part Number: C1550551
- Symbol Style: parametric\-v1
- Manufacturer Name: SILICON LABS
- Manufacturer Part Number: CP2102N\-A02\-GQFN24
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.lcsc\.com/datasheet/C1550551\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VeUlZXRFZcVTsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Role: USB UART
- JLCPCB Part Class: Extended Part
- Role Details: USB firmware diagnostics and automatic download control

**Pins:**
- CTS [pin 18]
- D\- [pin 4]
- D\+ [pin 3]
- DCD [pin 24]
- DSR [pin 22]
- DTR [pin 23]
- EP [pin 25]
- GND [pin 2]
- GPIO\.0/TXT [pin 14]
- GPIO\.1/RXT [pin 13]
- GPIO\.2/RS485 [pin 12]
- GPIO\.3/WAKEUP [pin 11]
- NC [pin 16]
- NC [pin 10]
- RI/CLK [pin 1]
- RSTb [pin 9]
- RTS [pin 19]
- RXD [pin 20]
- SUSPEND [pin 17]
- SUSPENDb [pin 15]
- TXD [pin 21]
- VBUS [pin 8]
- VDD [pin 6]
- VIO [pin 5]
- VREGIN [pin 7]

### U3 — BK4819

- Role Details: Provisional RX\-only AM; no PA output path; AM selectivity and traceable sourcing unverified
- Functional Group: RF U3 Airband Receiver
- Package or Case Code: QFN\-32\-EP\-4x4mm\-P0\.4
- Manufacturer Part Number: BK4819
- Part Type: Integrated Circuits
- Manufacturer Name: Beken
- Datasheet URL: https://viva\-telecom\.org/SHOP/FILES/TYT/bk4819\.pdf
- Role: Modulation / Demodulation

**Pins:**
- EARO [pin 8]
- GND [pin 33]
- GPIO0 [pin 28]
- GPIO1 [pin 29]
- GPIO2 [pin 30]
- GPIO3 [pin 31]
- GPIO4 [pin 32]
- GPIO5 [pin 1]
- GPIO6 [pin 2]
- LNAIN [pin 15]
- MICN [pin 13]
- MICP [pin 14]
- NC10 [pin 10]
- NC12 [pin 12]
- NC16 [pin 16]
- NC19 [pin 19]
- NC20 [pin 20]
- NC21 [pin 21]
- NC22 [pin 22]
- NC23 [pin 23]
- NC24 [pin 24]
- NC6 [pin 6]
- NC7 [pin 7]
- NC9 [pin 9]
- PAOUT [pin 17]
- SCK [pin 25]
- SCN [pin 26]
- SDATA [pin 27]
- VCC\_A [pin 11]
- VCC\_D [pin 3]
- VRAMP [pin 18]
- XI [pin 5]
- XO [pin 4]

### U4 — [ES8388](https://flux.ai/lcsc/es8388~z8bu.md)

- Functional Group: ANALOG U4 Audio Codec
- Role Details: Receiver analog ADC to ESP32; DAC to headphone and speaker
- Manufacturer Part Number: ES8388
- Symbol Style: parametric\-v1
- Manufacturer Name: Everest\-semi\(顺芯\)
- Product Info Url: https://lcsc\.com/product\-detail/Codec\-ICs\_Everest\-Semiconductor\-ES8388\_C365736\.html
- Part Type: Codec ICs
- Package or Case Code: QFN\-28\_L4\.0\-W4\.0\-P0\.45\-BL\-EP
- LCSC Part Number: C365736
- Role: Signal Mixing / Detection
- JLCPCB Part Class: Extended Part
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1912111437\_Everest\-semi\-Everest\-Semiconductor\-ES8388\_C365736\.pdf

**Pins:**
- ADCVREF [pin 19]
- AGND [pin 18]
- ASDOUT [pin 8]
- AVDD [pin 17]
- CCLK [pin 28]
- CDATA [pin 27]
- CE [pin 26]
- DGND [pin 4]
- DSDIN [pin 6]
- DVDD [pin 2]
- EP [pin 29]
- HPGND [pin 13]
- HPVDD [pin 16]
- LIN1 [pin 24]
- LIN2 [pin 22]
- LOUT1 [pin 12]
- LOUT2 [pin 15]
- LRCK [pin 7]
- MCLK [pin 1]
- NC [pin 9]
- NC [pin 25]
- PVDD [pin 3]
- RIN1 [pin 23]
- RIN2 [pin 21]
- ROUT1 [pin 11]
- ROUT2 [pin 14]
- SCLK [pin 5]
- VMID [pin 20]
- VREF [pin 10]

### U5 — [TPS63070RNMR](https://flux.ai/jecstronic/tps63070rnmr~5z7.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Integrated Circuit
- Manufacturer Part Number: TPS63070RNMR
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/tps63070\.pdf
- Functional Group: POWER U5 3V3 Buckboost
- Role: Power Conversion
- Role Details: 3V3 budget 348mA typical 830mA peak; source peak1\.78A at2\.85V including speaker
- Manufacturer Name: Texas Instruments Inc\.

**Pins:**
- EN [pin 14]
- FB [pin 5]
- FB2 [pin 6]
- GND [pin 4]
- L1 [pin 11]
- L2 [pin 9]
- PG [pin 2]
- PGND [pin 10]
- PS/S [pin 1]
- VAUX [pin 3]
- VIN\_1 [pin 12]
- VIN\_2 [pin 13]
- VOUT\_1 [pin 7]
- VOUT\_2 [pin 8]
- VSEL [pin 15]

### U6 — [BQ24074RGTT](https://flux.ai/lcsc/bq24074rgtt~fpyl.md)

- Functional Group: POWER U6 Battery Charger
- Role: Power Conversion
- Role Details: Powerpath charger; source peak1\.78A battery; USB current selection must be source qualified
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/bq24074\.pdf
- Part Type: Battery Management ICs
- JLCPCB Part Class: Extended Part
- Package: VQFN\-16 RGT \(3 mm × 3 mm\) with exposed thermal pad
- Implementation Details: Standalone single\-cell Li\-Ion/Li\-Polymer linear charger and power\-path management IC; 4\.2 V battery regulation, 4\.4 V OUT regulation, 10\.5 V OVP, 1\.5 A programmable fast charge/input current limit\.
- LCSC Part Number: C2861252
- Operating Voltage: IN operating range 4\.35–10\.2 V for BQ24074; IN withstand/recommended range up to 26 V, abs max 28 V
- License: https://creativecommons\.org/licenses/by/4\.0/
- Symbol Style: parametric\-v1
- Operating Temperature: \-40 to 85°C
- Manufacturer Part Number: BQ24074RGTT
- Package or Case Code: VQFN\-16\_L3\.0\-W3\.0\-P0\.50\-TL\-EP1\.7
- Manufacturer Name: Texas Instruments

**Pins:**
- \~\{CE\} [pin 4]
- \~\{CHG\} [pin 9]
- \~\{PGOOD\} [pin 7]
- BAT [pin 2]
- BAT [pin 3]
- EN1 [pin 6]
- EN2 [pin 5]
- EP [pin 17]
- ILIM [pin 12]
- IN [pin 13]
- ISET [pin 16]
- ITERM [pin 15]
- OUT [pin 11]
- OUT [pin 10]
- TMR [pin 14]
- TS [pin 1]
- VSS [pin 8]

### U7 — [PAM8302AASCR](https://flux.ai/lcsc/pam8302aascr~ikb.md)

- Functional Group: ANALOG U7 Speaker Driver
- JLCPCB Part Class: Extended Part
- Role Details: Mono BTL speaker amplifier 8ohm; software controlled shutdown
- Manufacturer Part Number: PAM8302AASCR
- Product Info Url: https://lcsc\.com/product\-detail/Audio\-OpAmps\_DIODES\_PAM8302AASCR\_PAM8302AASCR\_C113367\.html
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/1809192050\_Diodes\-Incorporated\-PAM8302AASCR\_C113367\.pdf
- LCSC Part Number: C113367
- Package or Case Code: MSOP\-8\_L3\.0\-W3\.0\-P0\.65\-LS5\.0\-BL
- Role: Amplification
- Manufacturer Name: DIODES\(美台\)
- Part Type: Audio Power OpAmps

**Pins:**
- \~\{SD\} [pin 1]
- GND [pin 7]
- IN\- [pin 2]
- IN\+ [pin 3]
- NC [pin 8]
- VDD [pin 6]
- VO\- [pin 8]
- VO\+ [pin 5]

### U8 — [TPD2EUSB30](https://flux.ai/kicad-part-library/tpd2eusb30~px7.md)

- Datasheet URL: http://www\.ti\.com/lit/ds/symlink/tpd2eusb30a\.pdf
- Role Details: USB D\+/D\- ESD clamp
- Functional Group: IO J1 USB\-C
- Role: Protection
- Manufacturer Name: Texas Instruments Inc\.
- Package or Case Code: Texas\_DRT\-3
- Manufacturer Part Number: TPD2EUSB30

**Pins:**
- D\- [pin 2]
- D\+ [pin 1]
- GND [pin 3]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/colinlongworth/touchscreen\-airband\-scanner\~86](https://flux.ai/colinlongworth/touchscreen-airband-scanner~86).*

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*Generated from [https://flux\.ai/colinlongworth/touchscreen\-airband\-scanner\~86](https://flux.ai/colinlongworth/touchscreen-airband-scanner~86)*