Xhdata D-808 Schematic ⚡ Popular

Through specific firmware patches, the Si4735 enables Single Sideband (SSB) reception, a feature usually reserved for much larger desktop receivers.

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

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 internal design is typically split between two main circuit boards connected by a ribbon cable. 1. The RF Front-End

For the speaker output, an LM4863S or similar audio amplifier IC is used to drive the built-in 3-inch speaker. Version Differences: Original vs. New

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

The new version has fewer manual adjustment points (coils and trimmers), relying more on fixed-value components to save manufacturing time.

Newer units may feature a different audio amplifier with slightly different power characteristics compared to the original high-quality model. Common Modifications

Some users have noted the removal of certain front-end filters in newer units, which can lead to increased FM breakthrough on the shortwave bands.

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