I build a data logger with Arduino MEGA, SD, Ethernet, RTC, GSM, display module, and thermal printer. I am facing problem with unregulated power supplies. I have tried many power adapters, phone chargers, led strip power supplies and noone is 5±0.2V regulated. All power supplies are over 5V and are drifting overtime. I tried led power supply with buck converter 5V and the output was 5.4V. The only good power supply was ATX PSU but it is waste of money.

I need a 5V 2.5-3A regulated power supply, how can I find or build one?

Note: The device is going to work continuously over 5 years

  • \$\begingroup\$ On the commercial market you can find plenty of proper power supplies. Since you want to work over 5 years you not only need a power supply but also power backup and an alarm system. \$\endgroup\$ – Decapod Apr 25 '17 at 9:30
  • \$\begingroup\$ What is the total current requirement? \$\endgroup\$ – Dwayne Reid Apr 25 '17 at 9:30
  • \$\begingroup\$ @Decapod I have already build backup system with alarm notification with sound and call on phone. \$\endgroup\$ – Jim Apr 25 '17 at 9:33
  • \$\begingroup\$ A High-quality Phone Charger power-supply such as those made by Apple or Samsung MIGHT last many years. Or maybe not. Inexpensive (no-name Asian) supplies probably will NOT. \$\endgroup\$ – Dwayne Reid Apr 25 '17 at 9:33
  • 2
    \$\begingroup\$ Actual supply voltage is usually not critical. Most stuff designed for 5V operation will happily run from a supply voltage of 4.5 - 5.5 Vdc. Check the specs of ALL of the equipment and devices running from that supply. \$\endgroup\$ – Dwayne Reid Apr 25 '17 at 9:35

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