STK3048A+STK6153 power amplifier circuit

Motorcycle mainly focuses on the following aspects:
    (1) Add a first-stage common source and common base amplifier to the input of ST K30 48A. The idea is to use the input stage of Corus's SAM module
to obtain high transconductance and low noise motherboard
    (2). Use the post-stage Darlington tube in ST K615 3 as a voltage stabilizing filter to ensure that the front stage is not affected by large dynamics. Affected by the subsequent stage,
    the final stage (3) adopts ultra-large current MOS field effect transistor 2SK851. Judging from the technical indicators, it has large current, small on-resistance,
fast switching speed, low distortion rate, and can drive low-impedance loads. The price is about 23 yuan each, which is equivalent to A13 01/C 3 2 80.
    (4) The power supply adopts the switching power supply DNC from Wuhan Tianlong Electronics Research Institute. 3 5 0
    (5) adopts current negative feedback and midpoint DC potential servo technology, which not only improves the sense of hearing, but also prevents zero point drift. The actual
measurement is only 5mV per channel 6
    (6) Use the fan used in the computer switching power supply to force the heat dissipation of the white circuit