Amateur Radio: FTDI USB to TTL Serial Adapter - 3.3V and 5V
New Module 3.3V 5V 12V Dual Output DC DC Step Down Buck Converter Board 10W 2 Channels Multiple Switch Power Supply|Voltage Regulators/Stabilizers| - AliExpress
Amazon.com: VM1898 Universal AC to DC Adapter Converter for Worldwide Use with 100V, 110V or 220V/240 Volts. Ouput 3V, 3.3V, 5V, 6V, 6.5V, 7V & 8.4V Eliminates Use of Expensive Batteries :