Xhdata D-808 Schematic _best_ Jun 2026

The radio has undergone several hardware revisions, which are critical to note when reviewing its schematic or circuit design.

If you are opening up your XHDATA D-808 for repair or tracing signals with an oscilloscope, focus on these critical areas of the circuit board: Power Regulation and Charging Circuit

Some users note a faint "hiss" or "chuffing" artifact when tuning through frequencies, caused by the Si4735's aggressive internal digital muting during tuning steps. xhdata d-808 schematic

Verify supply voltage at the audio amp pin; check for DC offset at the speaker pads. I2C Pull-up Resistors

. This design allows the device to offer advanced filtering and tuning capabilities within a compact form factor. Key Schematic Features Multiband Coverage The radio has undergone several hardware revisions, which

The MCU acts as the "brain" of the radio. It manages the user interface, reads the rotary encoder and keypad matrices, drives the LCD screen, and communicates with the Si4735 via an I2C serial bus. It is responsible for pushing the SSB patch data to the DSP chip every time the radio is powered on. Audio Amplifier IC

Features a Micro-USB port and variable coils for factory alignment (Main PCB dated 2017-08-29). Newer (2023+): Transitions to a USB-C port I2C Pull-up Resistors

Post-DAC, the audio goes into an analog amplifier. In early D-808 revisions, this was a generic Class-AB amplifier. Later revisions use a smaller SMD chip (often marked "4890" or similar to the LM4890). If your speaker is crackling but headphones work, the fault is here.

The D-808 uses a telescoping antenna for FM/SW/AIR and an internal ferrite rod antenna for MW/LW 1.2.2.