XC846原理图1 2 +5v P0R4102 P0C1902 P0C1901 3 P0C0A02 P0C0A01 P0R0A01 4 +12v P0C1A02 P0C1A01 P0D0A01 P0D0A02 P0V0A02 +12v P0C202 P0C201 P0Q0A02 P0R4A02 12v/60v C2 C0A 104 4007 D0A + P0D1A01 P0D1A02 47uF/25V key Dp1 P0Dp101 P0U1A08 P0Q0A03 P0R4101 302 P0Rp1A02 302 P0Rp1B02 Qp1 2N2907 P0Qp101 P0Qp102 P0Qp103 R2 R3 P0Q1A02 P0Rp902 P0Cp101 P0Cp102 P0M202 A +5V GND Rp1A Rp1B P0R301 621 P0C301 P0R302 3 P0M203 P0M201 Vin Vout M2 1 P0D201 D2 N0GL P0U1A01 GL 1 P0D202 P0U1A04 P0U1A02 P0R4202 P0Q2A03 P0Dp102 P0R201 621 P0R202 102 R5 P0R502 U1A P0U1A03 P0R501 +5v-out 3.5v/3.7v P0C602 P0C601 3 2 N0UH UH R1A P0R1A01 2K2 Q1A P0R1A02 P0Q1A01 2N5551 P0Rp1A01 P0Rp1B01 4 P0Rp901 P0C401 P0Qp303 P0C302 2 78L05 P0Q4A03 P0Qp403 P0Qp301 332 P0Rp1002 102 P0Rp……