USB to 2.1mm DC Booster Cable - 12V - Kamami on-line store

USB to 2.1mm Male Barrel Jack Cable 1m - PARTCO

Akyga IEC C13 CEE 7/7 250V / 50Hz angle cable with a length of 1.5 meters

Akyga angled power cable 250V / 50Hz 1.5m

Step-Down converter with adjustable or constant output voltage from 0.8 to 17 V, input voltage from 4.5 to 24 V and a maximum current of up to 3 A

DC-DC Step-Down Converter Module 0.8-17V 3A

Step-Up converter with an output voltage of 12 to 80 V, an input voltage of 8 to 60 V and a maximum current of up to 20 A

DC-DC Step-Up Converter Module 12-80V 20A

Adafruit TPL5110 Low Power Timer Breakout : ID 3435 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Power cable with PD 20Vtrigger USB type C - DC 4.8x1.7mm 1.8m (HP) - Kamami on-line store

Adafruit USB Type C Power Delivery Dummy Breakout - I2C or Fixed [HUSB238] : ID 5807 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits

STEP-UP DC/DC voltage converters - PARTCO

Cable (adapter) with a female DC 5.5x2.1mm connector and alligator clips - Kamami on-line store

STEP-UP DC/DC voltage converters - PARTCO

Step-Down converter with adjustable or constant output voltage from 0.8 to 17 V, input voltage from 4.5 to 24 V and a maximum current of up to 3 A

DC-DC Step-Down Converter Module 0.8-17V 3A

This cable is kinda fascinating - it has an integrated boost converter, so you can plug it into any USB port (from a computer, battery pack, etc) and

USB to 5.5mm / 2.1mm DC Booster Cable - 12V Output

Adafruit TPL5110 Low Power Timer Breakout : ID 3435 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits

STEP-UP DC/DC voltage converters - PARTCO

Akyga IEC C13 CEE 7/7 250V / 50Hz angle cable with a length of 1.5 meters

Akyga angled power cable 250V / 50Hz 1.5m