Arduino Power Supply v18.08

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Research

Power requirements for Arduino Mega (usually <70 mA, 200 mA max) and RepRap Discount Smart Controller (40-100 mA?). 300 mA max to power control and display circuits.

Drawing Power from Grid without Transformer for *Low Power* Applications

Precise voltage measurement with the Arduino

High Efficiency 400W AC/DC Power Supply Reference Design

Electronics Design

These designs are not guaranteed to be safe or functional. Use at your own risk.

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Bill of Materials

Cac = 10 uF

Cac discharge resistor: 1 MOhm

Bridge diodes (x4): UPL4.004

Filter capacitor: 680 uF

Output zener: UPL4.009

Voltage reference: IC VREF SHUNT 4.096V TO92-3

Voltage reference resistor: 5.6 kOhm