PI-AD20 small power amplifier

Opening the case, a clean and solid circuit board is revealed. Professional assembly line welding points are smooth and clean, 105'c non-
burned capacitors, ultra-thin dual potentiometers, and professional aluminum radiators. Whether I listen to it with headphones or a small speaker, the sound quality is pure and natural,
the frequency response is broad, and noise is almost non-existent. When connected to a homemade subwoofer, the sound immediately becomes deep and powerful;
when connected to two channels at the same time, it is also very integrated. The market price of this machine is only a few tens of yuan. It is a great value.
    The disadvantage is that the stereo headphone output uses M5216 op amp for amplification, and its power is really limited. If you can use TDA2822,
7050T, UI. Replacement of low-power amplifiers such as N3782 will achieve better results