Mini DC 12-24V To 5V 3A Step Down Power Supply Module Voltage Buck Converter Adjustable 97.5% 1.8V 2.5V 3.3V 5V 9V 12V
Aliexpress UK
10PCS/LOT CH340E MSOP10 USB to TTL Serial Converter, 5V/3.3V Alternative CH340G Module TYPE-C Interface For Arduino Pro mini
Aliexpress UK
XL6019 (XL6009 Upgrade) Automatic Step-Up Step-Down Dc-Dc Adjustable Converter Power Supply Module 20W 5-32V to 1.3-35V
Aliexpress UK
PC817 2 4 8 Channel Optocoupler Isolation Board Voltage Converter Adapter Module 3.6-30V Driver Photoelectric Isolated Module
Aliexpress UK
CH340G CH340 3.3V 5V Switch USB to TTL Converter UART Module
Aliexpress UK
3Pcs DC-DC 48V 60V 100V to 1.25V-48V Step Down Module Board Voltage Buck Adjustable Power Supply Converter 2.5V 3.3V 5V 9V 12V
Aliexpress UK
DC-DC 5V to 3.5V / 12V USB Step UP / Down Power Supply Module Adjustable Boost Buck Converter Out DC 1.2V-24V
Aliexpress UK
mini Type-C 5V 2A Charge discharge module Charging Protection Board Boost Converter POWER 1S 4.2V 3.7V 18650 lithium battery
Aliexpress UK