Lac503p: Schematic

: If a specific part is failing, the schematic will provide the correct values or part numbers needed for a replacement. Warning for DIY Repairs

The schematic begins at pins 2 and 3 (IN_A, IN_B). The internal multiplexer is controlled by the logic states of SEL_0 and SEL_1 (Pins 7 & 8). This allows the chip to sample multiple sensor inputs or audio lines. The selected signal is routed to the internal amplifier. lac503p schematic

Vcc (12V) ──┬── 100uF ── GND │ └── pin1 (Vcc) │ pin4 (Ref) ── 10k ── GND (sets 2.5V) │ pin2 (Osc) ── 47k ── GND ── 1nF ── GND (sets ~50kHz) │ pin3 (FB) ── 10k ── to output voltage divider │ pin7 (Enable) ── 10k pull-up to Vcc │ pin15 (CL) ── from current sense resistor (0.1Ω) via RC filter │ pin9 (Out) ── 1k gate resistor ── to MOSFET gate (e.g., IRF540) │ pin13 (Fault) ── LED + 330R ── Vcc : If a specific part is failing, the