Arduino Power Supply v18.08

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Design

Requirements

• Up to 300 mA supply (200 mA would likely be enough)

• 7-12 V DC output

• 120 V ac input

• Stable voltage reference of less than 5V

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

Calculations

[1]

Electronics Design

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

[2]

Bill of Materials

Fuse: FUSE GLASS 1A 250VAC 5X20MM

Cac: CAP FILM 10UF 5% 400VDC RADIAL

Cac discharge resistor: UPL1.064 RES SMD 1M OHM 1% 1/4W 1206

Bridge rectifier: RECT BRIDGE 2A 40V 4SMDIP or UPL4.004 DIODE SCHOTTKY 40V 1A SOD123x4

Filter capacitor: CAP ALUM 680UF 10% 10V RADIAL

Output zener: DIODE ZENER 9.1V 5W AXIAL

Voltage reference: IC VREF SHUNT 4.096V TO92-3

Voltage reference resistor: RES 5.6K OHM 5W 5% AXIAL

Total cost of components ~$10