MyoWare 2.0 Power Shield - power module for the muscle tension sensor

Pololu 2834

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

Efficient step-down converter that reduces the input voltage from up to 45 V to a regulated output voltage range from 1.4 to 7 V, offering high efficiency and a maximum continuous current of 3.8 A. It has built-in protection against reverse polarity, overload and short circuit, and the spread spectrum function reduces EMI interference. The module is equipped with an additional potentiometer for adjusting the cut-off voltage. Pololu 4852

Step-Down converter D36V50F3 with an output voltage of 3.3 V, an input voltage from 4.5 to 50 V and a maximum output current of 9.5 A. Pololu 4090

Step-Down converter D36V50F9 with an output voltage of 9 V, an input voltage from 9.9 to 50 V and a maximum output current of 7 A. Pololu 4094

This compact (0.4″ × 0.5″) switching step-down (or buck) voltage regulator takes input voltages up to 50 V and efficiently reduces them to 9 V while allowing for a maximum output current of 600 mA. It has a very low dropout, so it can be used with input voltages that are within a few hundred millivolts of its output.

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 12 A

The compact (0.4″ × 0.5″) D24V5F1 synchronous buck voltage regulator takes input voltages between 3 V and 36 V and efficiently reduces them to 1.8 V while allowing for a maximum output current of 500 mA. This regulator offers typical efficiencies between 75% and 90%. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

Step-Down converter module converts input voltage (5-23V) to adjustable output voltage (0-16.5V) with maximum current 3A, featuring high precision (1%) and efficiency (up to 95%). Compact size and display make it ideal for various applications, e.g. DIY projects

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-up DC-DC converter module based on the LM2587 circuit, input voltage 3.5..30V, regulated output voltage 4..30V. The module is equipped with ARK connectors

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.

Step-Down DC-DC converter module based on the D36V6F3 system. Input voltage 4 ... 50V, output voltage 3.3V (max. 600mA). Polol 3791

The Step-Up/Step-DownS10V4F5 Buck Voltage Regulator module with output voltage 5V, input voltage range of 2.5-18V and a maximum output current of 400mA. Pololu 2121

DC-DC Step-Up/Step-Down Converter Module. It has an input voltage of 1.4 to 16 V, an output voltage of 5 V and a maximum output current of 1 A to 1.5 A. Pololu 4965

The Step-Up converter module converts the voltage in the range of 10-60V to 12-90V with an efficiency of 97% and operates in the temperature range of -20°C to 65°C. The maximum current is 40A at the input and 22A at the output, with a weight of 400g.