5V Relay Module
Power
Single-channel relay board that lets a low-voltage logic signal (5V) switch a high-power AC or DC load.
LM2596
Power
Adjustable step-down (buck) converter module.
MT3608
Power
Adjustable step-up (boost) converter module — the opposite of the LM2596.
TP4056
Power
Single-cell Li-ion/Li-Po battery charger module.