: Some production runs of the D-808 feature an aggressive "chugging" or muting sound when scrolling through frequencies quickly. Modifiers trace the soft-mute pin trace on the Si4735 layout and bridge it with a small capacitor or resistor to smooth out the audio transition while tuning.
If you are looking for specific board layouts, first identify which version you have: Original Version
The whip antenna lead connects to the FM-SW circuitry, while MW/LW signals are primarily handled by the internal 3 7/8” ferrite rod antenna DSP Processing:
Are you looking to a specific issue (like no sound or no power)? xhdata d-808 schematic
The XhData D-808 is a portable, digital shortwave radio receiver that covers a wide range of frequencies, making it capable of receiving broadcasts from around the world. It features a digital signal processing (DSP) system, which enhances audio quality and allows for noise reduction and other advanced signal processing capabilities. The device is compact, powered by batteries or an external power source, and often praised for its sensitivity and selectivity.
What is your with surface-mount device (SMD) components?
Do you need help identifying a on the board? Share public link : Some production runs of the D-808 feature
: Contains the Si4735 DSP chip and front-end filtering. Notably, newer versions (released around late 2022) feature a major revision of this board with fewer filtering components and a USB-C port instead of the original micro-USB. Charging Circuit : Managed by a charging IC (U2) and protected by a (IC2) paired with an 82015A MOSFET (IC1) to prevent overcharging the 18650 Li-ion battery. MCU Backup
Communities on sites like Radioscanner.ru and various DXing forums have actively traced out partial schematics for the D-808 power, audio, and antenna stages. Searching for translated threads on these platforms yields hand-drawn schematics of high accuracy.
A custom-programmed microcontroller coordinates the user interface. It scans the keypad, tracks the rotary tuning encoder, and refreshes the LCD backlight and display digits. The XhData D-808 is a portable, digital shortwave
| Modification Name | What It Does | Key Component / Location | Source Reference | | :--- | :--- | :--- | :--- | | | Adds a 3.5mm jack for an external MW/LW antenna by cutting into the internal ferrite antenna connection. | A 5-pin female jack is added to the ferrite antenna pads; proper GND/hot identification is critical. | | | 27 pF Capacitor Mod | Adds an external antenna capability by placing a 27 pF capacitor on C10's backside. | 27 pF capacitor soldered onto the back of the PCB at C10, connecting to the ferrite antenna. | | | Loopstick Transplant ("Supercharging") | Replaces the internal MW ferrite antenna with a high-performance 7.5" loopstick for enhanced DXing. | A 7.5" loopstick (ferrite rod and Litz wire) replaces the small internal ferrite antenna. | |
The rotary tuning encoder relies on two phase-shifted pulse streams fed directly to interrupt pins on the MCU. The keyboard layout operates on a standard scanning matrix, minimizing the number of dedicated MCU pins required to register button presses. 4. Common Repair Inquiries and Diagnostic Points
Trace the signal backward from the DSP chip's RF input pins to the antenna. Look for protective ESD diodes (Electrostatic Discharge diodes) wired in parallel to the antenna input.
Because the factory schematic is restricted, the "deep guide" for most enthusiasts consists of popular hardware mods: XHDATA D-808 Radio