A20112 Power Supply Schematic -

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Key Parameters

• Primary: high-voltage winding
• Secondary: low-voltage output winding (12V)
• Auxiliary winding: powers the PWM controller after startup

Fixing noisy eico hf-12 amplifier with tube issues? - Facebook a20112 power supply schematic

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Section 7: Safety Precautions When Working with the A20112 Schematic

• Bulk capacitors (C1) retain 300V+ even after unplugging. Discharge with a 10kΩ 5W resistor.
• Use an isolation transformer when probing the primary side with an oscilloscope.
• Never open the feedback loop without a dummy load – output voltage can skyrocket.
• Assume the entire primary side is live relative to earth ground.

• AC Live → F1 → L1 pin1
• L1 pin3 → CX1 → DB1 pin1
• AC Neutral → L1 pin2
• L1 pin4 → DB1 pin3
• DB1 pin2 (+) → C1 (+) → T1 primary pin1
• DB1 pin4 (-) → GND Primary

Downsizing Benefits: Circuits using this IC can use smaller filters and capacitors, significantly lowering the total cost of the power unit. 2. Core Sections of an A20112 Schematic Fixing noisy eico hf-12 amplifier with tube issues