Name: 2.1mm DC Barrel Plug to Alligator Clips
Brand: Adafruit
SKU: 1329

Logical pinout · physical placement not verified

Red alligator clip
Adafruit states the red alligator clip is connected to the 2.1 mm barrel plug centre positive contact.
Type · PowerVoltage · Usable up to 24 VDC per Adafruit product page.
Black alligator clip
Adafruit states the black alligator clip is connected to the 2.1 mm barrel plug ring negative contact.
Type · GroundVoltage · Usable up to 24 VDC per Adafruit product page.
2.1 mm DC barrel plug
2.1 mm DC barrel plug brought out to centre-positive red clip and ring-negative black clip.
Type · PowerVoltage · Good for about 2 or 3 A current and up to 24 VDC per Adafruit product page.

Pin	Type	Function	Voltage
Red alligator clip	Power	Adafruit states the red alligator clip is connected to the 2.1 mm barrel plug centre positive contact.	Usable up to 24 VDC per Adafruit product page.
Black alligator clip	Ground	Adafruit states the black alligator clip is connected to the 2.1 mm barrel plug ring negative contact.	Usable up to 24 VDC per Adafruit product page.
2.1 mm DC barrel plug	Power	2.1 mm DC barrel plug brought out to centre-positive red clip and ring-negative black clip.	Good for about 2 or 3 A current and up to 24 VDC per Adafruit product page.

Logical pinout · physical placement not verified

Pin details

3 connections

Red alligator clip
Adafruit states the red alligator clip is connected to the 2.1 mm barrel plug centre positive contact.
PowerVoltage · Usable up to 24 VDC per Adafruit product page.
Black alligator clip
Adafruit states the black alligator clip is connected to the 2.1 mm barrel plug ring negative contact.
GroundVoltage · Usable up to 24 VDC per Adafruit product page.
2.1 mm DC barrel plug
2.1 mm DC barrel plug brought out to centre-positive red clip and ring-negative black clip.
PowerVoltage · Good for about 2 or 3 A current and up to 24 VDC per Adafruit product page.

Start wiring

3.3 V · 5 V

Adafruit lists its single-cell LiPo and Li-ion packs as 3.7 V nominal, with output reaching 4.2 V when fully charged.

Module pins: Red alligator clip, Black alligator clip. Schematik maps them to your board in the app.

Batteries

103 other options

9V alkaline cells, CR2032 coin cells, 3.7V LiPo packs (1000–1200mAh), 7.4V 2S LiPo, 18650 Li-ion holders (1–6 cells), AA/AAA holders in every configuration, and snap leads with barrel adapters.

View all 103

Related groups

4 groups

Charging

Single-cell LiPo chargers (TP4056, MicroUSB/Type-C modules), charger/booster combos (PowerBoost 500/1000, Lipo Rider Plus 5V/2.4A), I2C fuel gauges (MAX17048, LC709203F) and Qi wireless charging coils.

Power · Chargers & fuel gauges · 47 parts

Power supplies

Wall adapters (5V–24V), adjustable and fixed buck/boost/buck-boost converters (MT3608, LM2596-class), USB-C PD triggers (HUSB238), breadboard supplies, DIN-rail units and passive barrel-jack adapters.

Power · Supplies & regulators · 147 parts

Solar

Solar panels from 1.5V 250mA flexible film to 18V 10W polysilicon, MPPT solar power managers (DFRobot 5V and 9V/12V/18V, Waveshare 6V–24V), bq25185 charger boards and LTC3588 energy-harvesting breakouts.

Power · Solar power · 28 parts

3D printing

DFRobot 1.75 mm PLA in 1 kg spools makes up the bulk of the group, in over 15 colors. Specialty options include PVA in both diameters, NinjaFlex flexible filament, Proto-Pasta conductive PLA, and wood-fill. OverLord printer spares and OverLord printers round out the hardware side.

Tools & prototyping · 3D printing · 53 parts