BMS system for three Li-Ion cells with a voltage of 12 V. It has the function of charging with balancer, discharging and over-discharge protection. The cells can be charged with continuous current up to 60 A and discharged with current up to 80 A

Step-Down converter D36V50F12 with an output voltage of 12 V, an input voltage from 13.3 to 50 V and a maximum output current of 6.5 A. Pololu 4095

Step-Down converter D36V50F7 with an output voltage of 7.5 V, an input voltage from 8.3 to 50 V and a maximum output current of 7 A. Pololu 4093

A power supply based on a DC-DC converter with a current capacity of up to 6.1 A. The input voltage can range from 6 V to 30 V, while the output voltage is adjustable from 0 V to 36 V. XYL3606S

DC-DC Step-Up converter U3V40F5 with an output voltage of 5 V, an input voltage of 1.3 to 5 V and a maximum output current of 4 A. Pololu 4012

The protection circuit for one Li-Ion cell with a voltage of 3.7 V. It has the function of charging, discharging and over-discharge protection. The cells can be discharged with a continuous current of up to 6 A

DC-DC Step-Down converter module AP63203 with an output voltage of 3.3 V, an input voltage of 3.8 to 32 V and a maximum output current of 2 A. SparkFun COM-18356

A handy way to power 12V powered devices with a center-positive 2.1mm DC barrel jack from a USB port. Adafruit 2778

DC-DC Step-Down converter module AP63203 with an output voltage of 3.3 V, an input voltage of 3.8 to 32 V and a maximum output current of 2 A. SparkFun COM-18357

Power multiplexer based on Texas Instruments TPS2113A. It enables smooth switching between two power sources from 2.8 V to 5.5 V. Pololu 2596

Step-Down converter D36V28F12 with an output voltage of 12 V, an input voltage from 12.9 to 50 V and a maximum output current of 3.3 A. Pololu 3786

Step-Down converter D36V28F3 with an output voltage of 3.3 V, an input voltage from 4.5 to 50 V and a maximum output current of 4.5 A. Pololu 3781

Step-Up/Step-Down converter module based on the S13V30F5 system, input voltage from 2.8 to 22 V, output voltage 5 V. Current efficiency of the converter 4 A. Pololu 4082

The Step-UpU1V11F3 Buck Voltage Regulator module with output voltage 3.3V, input voltage range of 0.5-5.5V and a maximum output current of 1.2A. Pololu 2561

DC-DC Step-Up converter U3V40F6 with an output voltage of 6 V, an input voltage of 1.3 to 6 V and a maximum output current of 4 A. Pololu 4013

The compact (0.4″ × 0.5″) D24V5F12 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to 12 V while allowing for a maximum output current of 500 mA.

Power supply module with an input voltage from 6 to 12 V and a configurable output voltage of 3.3 V or 5 V. It has holes with a 2.54 mm pitch. Perfect for use with a breadboard. SparkFun PRT-13032

A small DC - DC boost module that converts a 0.9..5V power source to standard 5V, making it capable of supplying power to an Arduino microcontroller and other small electronic devices that use a 5v input. It integrates a PFM DC-DC boost control chip. FIT0471

Step-Up/Step-Down converter module based on the S13V20F5 system. It has an input voltage from 2.8 to 22 V and an output voltage of 5 V. The current efficiency of the converter is up to 2,5 A. Pololu 4085

DC voltage converter with adjustable and stabilised output voltage from 0.5 V to 32 V. It can handle loads up to 4 A and has an output of up to 50 W. It features a colour display and a handy user interface. Fnirsi DC/DC converter 50W