不少仿制者直接抄 Top 层走线，却忽略了以下细节：
The transition from Schematic to Top Layer is bridged by the PCB Layout. xin zhi zhao schematic top
If you look at the PCB or schematic, here is what you will find on an XZZ Top board: xin zhi zhao schematic top
| Feature | Stock TI Reference | XZZ "Top" Implementation | | :--- | :--- | :--- | | Power Rail Caps | Standard electrolytic (1000µF) | Hybrid: High-ripple polymer + large electrolytic | | Bootstraps | 100nF X7R ceramic | 220nF-470nF C0G/NP0 (lower distortion) | | Input Filter | 1kΩ + 220pF (180kHz cutoff) | 470Ω + 1nF (120kHz cutoff, better RF rejection) | | GVDD (Gate Drive) | 1µF ceramic | 10µF tantalum + 100nF parallel (stiffer supply) | | Output Filter | 10µH + 0.68µF (for 4Ω) | 22µH + 1µF (for 8Ω) or ferrite bead only (full-range) | xin zhi zhao schematic top
Why this matters: The larger bootstrap caps prevent "pumping" at low frequencies. The stiffer GVDD reduces audible "hash" noise during quiet passages.
从流出的大多数复刻版图纸来看，辛之声的顶层逻辑如下：