connecting the two main boards, which must be handled carefully during disassembly. (like the ferrite rod upgrade) or component-level photos from community teardowns? XHDATA D-808 Radio
The D-808 has a brick-wall filter at 6 kHz. On the schematic, locate the audio output path between Si4735 pin 23 (OUT) and the headphone jack. There is a series capacitor (C49) and a resistor to ground (R56). Changing C49 from 0.1uF to 0.47uF opens up the treble, making shortwave sound less "muffled." xhdata d-808 schematic
Component-level notes:
The radio uses a CS4863 (equivalent to the LM4863 ) IC for audio output. Some technical analyses suggest that because the Si4735's output is low (~80mVrms), the CS4863 may produce audible background noise if not properly pre-amplified. connecting the two main boards, which must be
Characterised by a Micro-USB port and often a blue or orange screen. On the schematic, locate the audio output path