TPA6120 desktop headphone amplifier

(Please support the original author, for DIY use only, please do not use it for commercial use)
Introduction
This is a desktop Hi-Fi amp modified based on the open source TPA6120 amp of the UP host "Hack Lab" of Bilibili. It is based on the original work. The basic modifications are as follows:
replace the more expensive DC-DC power module (MORNSUN URA2412YMD, Creation No.: C970776) with the low-cost XL6007 ±SEPIC+ linear regulator solution,
and cut off the RCA Lotus input that I personally think is of little use. , only the 3.5mm line input is retained.
The power switch uses a combination of PMOS + small toggle switch to extend the service life of the toggle switch.
The power input adds TVS to provide surge protection, and is equipped with a self-restoring fuse relay
to power the L78M05, which is replaced with a larger size. The main improvement of the small 78L05
amp over the original work is the power supply. The generation of positive and negative power relies on the SEPIC circuit to provide a relatively symmetrical ±15V voltage. The schematic diagram is as follows.
The SEPIC output adds a first-level linear voltage regulator, MC7812+ MC7912 is used to provide stable and symmetrical positive and negative 12V voltage to the headphone amplifier chip and preamplifier. In terms of
actual effect measurement & physical display
, in terms of noise floor, there is no audible noise, whether it is 0% volume to 100% volume, or when there is no audio source input;
in terms of thrust, the thrust is sufficient, and there is no pressure when pushing the K92 with 32ohm impedance, the maximum Supports 600ohm impedance headphones;
in terms of effect, it has rich details and distinct layers, and has a good effect when listening to pop, symphony, rock and other music;
in terms of power supply, you can use a DC9V router power supply, the input voltage range is 9VDC-19VDC, you can find it by just browsing around Suitable adapter;
in terms of heat, it is mainly the amp chip that generates heat. The surface of the 6120 will be slightly hot when used for a long time, and DC-DC and LDOs will generate less heat.
The actual picture is as follows:
Measured video (to be supplemented)
 
Material list.
Most of the materials for this headphone amplifier can be purchased at Lichuang Mall. A few components require attention to specifications (potentiometer, headphone socket, aluminum electrolytic capacitor, toggle switch)