- $12.99BlueStars Pack of 2 DC Motor Pump Speed Controller 6V-90V 15A Speed Scale 0~100% 16KHZ PWM Speed Controller Regulator Module Board with Adjustable Potentiometer KnobAmazon
- $5.95Ferwooh MT3608 DC-DC Step Up Boost Power Converter Adjustable 2A Module Step Up Voltage Regulator Board Input 2-24V to Output 5V-28V (Pack of 5)Amazon