[AudioTOP] Dismantling Report of Feiao Linear Tail KA1
Feiao KA1 Dismantling Report
KA1 is Feiao's newly released mini non-replaceable small tail decoder. AudioTOP has already done its unpacking and evaluation a few days ago:
out of the box:http://www.audiotop.net/newsinfo/2639675.html
Evaluation:http://www.audiotop.net/newsinfo/2658356.html
KA1 is very lightweight, weighing less than 10g. Through the above set of comparison charts, everyone can have an intuitive understanding of its size.
KA1 adopts all-metal shell splash-proof design, and is tightly fitted with joints. It is impossible to disassemble without damage.
cutting, looking for breakthrough points
wanted to fight a blitzkrieg with tools of mass destruction. The direction is right, but fell into a blind temptation of unknown depth.
Separated End Cap
I thought this metal piece was just a thin sheet when I observed it from the outside, but in fact its thickness reached 2.5mm.
metal shell, cross-sectional viewing angle
continue to disassemble and extract the circuit board with pliers.
circuit board is completely separated from the housing
3.5mm earphone socket embedded in PCB
socket is inserted into the detection contact, which cooperates with the circuit to realize wake-up/standby function
Hollow-out PCB. Brand of earphone socket: Getwell, with mechanical tenon structure for assembly and positioning on the side
Family Characteristics
KA1 core component: ES9281AC pro
ES9281AC pro is a USB digital interface/DAC/ear amplifier three-in-one chip
typical application circuit diagram, complete functional configuration makes ES9281AC pro suitable for making compact small tail decoder. In addition to the earphone insertion detection, a microphone input was also provided.
as can be seen from the functional module diagram, the digital interface ES9281AC pro can receive data streams in various encoding formats including MQA. In addition, on the analog side, the output of the DAC can also bypass the built-in earpiece and send it to the external earpiece chip to achieve high power and balanced drive. For example, the architecture of Beam 3.
Backside of PCB
PCB front
AudioTOP met resistance in the process of liberating the circuit board. The tight assembly of KA1 and the thickness of the metal shell were destined to be not a pity from the beginning. Due to the single chip scheme, KA1 has a clear view of the circuit board. The selection of earphone socket and embedded installation further reduce the height size of the circuit board, reduce the thickness of a PCB, and center the opening position of the socket. The data line uses 4 strands of twisted wire to ensure long-term durability.
ES9281AC pro also has earphone impedance detection, which can automatically adjust the gain according to the size of the load, which allows users to obtain a similar loudness level without frequently adjusting the volume when replacing earphones with different impedances. At the same time, this function also avoids Android's volume adjustment distortion trap to a certain extent. In terms of integration, ease of use and user experience, ESS is ahead this time.
author:Headphones0 edited at 4-15 16:19
URL:https://weibo.com/ttarticle/p/show?id=2309404758552399970403
