Ultra-Low Noise LNA 50-4000MHz SPF5189 High Linearity RF Amplifier FM HF VHF/UHF. 13.32. Was: . 36V 10S 30A Li-ion Battery Protection Board BMS PCB for Electric Bike Ebike DIY. . This type of integrated circuit keeps a system running at a specific voltage level. Voltage regulators are used in a wide range of applications, including vehicle .