Xhdata D-808 Schematic May 2026

Unlike the other bands, the Air Band (118–137 MHz) often uses an analog front-end—typically a CD7358 IC for down-conversion to 10.7 MHz—which is then fed into the DSP.

The DSP architecture allows for selectable AM bandwidths (1.0, 1.8, 2.0, 2.5, 3.0, 4.0, and 6.0 kHz), which are crucial for rejecting interference on crowded bands. Detailed Circuit Breakdown

Because the D-808 is based on the well-documented Si4735, it is a favorite for hobbyists: xhdata d-808 schematic

The schematic for the RF section reveals how the radio handles incoming signals before they reach the DSP:

Through specific firmware patches, the Si4735 enables Single Sideband (SSB) reception, a feature usually reserved for much larger desktop receivers. Unlike the other bands, the Air Band (118–137

When examining a schematic, it is vital to know which version you own. Around 2023, XHDATA released a "New Version" (often identified by a USB-C port) with significant internal changes:

The radio is powered by a single 18650 lithium-ion battery . The charging circuit typically utilizes a dedicated chip near the USB-C or Micro-USB port to manage current and prevent overcharging. When examining a schematic, it is vital to

It supports FM (with RDS), LW, MW, and SW.

XHDATA D-808 Go to product viewer dialog for this item. has become a staple for radio enthusiasts due to its high performance and compact design. Understanding the and its internal architecture is key for anyone looking to repair, modify, or simply appreciate the engineering behind this versatile receiver. Core Architecture: The Silicon Labs Si4735

The "original" version of the D-808 included extensive shortwave front-end filters and adjustable trimmer caps to prevent FM breakthrough. 2. Power and Control