A20112 Power Supply Schematic Access

If you are laying out a new PCB based on the A20112 schematic, design layout choices heavily impact long-term reliability.

Specifically looking for:

for 1980s-era components.

[AC Input] ──> [Protection/EMI] ──> [Transformer] ──> [Rectifier Bridge] ──> [Filter Caps] ──> [Regulators] ──> [DC Output] Stage 1: Input and Protection Section a20112 power supply schematic

Usually configured for 110V/220V AC (50/60 Hz) or a high-voltage DC pre-regulator rail. If you are laying out a new PCB