🔌 Barrel Power Connector (Terminator)
 
(DC Plug Adapter • 5.5 mm x 2.1 mm or 5.5 mm x 2.5 mm • Pigtail or Screw Terminal • DC Power Integration)

This connector terminates a standard DC barrel plug into either bare wire leads or a screw terminal block, allowing easy integration into custom power setups, prototyping rigs, and DIY electronics.
 
🔧 Connector Form
Format: Male or Female barrel plug
Common sizes:
5.5 mm outer × 2.1 mm inner (most common)
5.5 mm outer × 2.5 mm inner (less common)
Termination types:
Pigtail — short leads for soldering or crimping
Screw terminal — block with two screws for quick wire insertion
Polarity: Center‑positive (typical), but must be confirmed per device
 
🖥️ Compatible Devices
🟦 Power Supply Integration
LED strips and controllers
Security cameras and DVRs
Arduino and Raspberry Pi projects
Portable routers and modems
🟦 DIY & Lab Builds
Breadboard power injection
Custom enclosures and breakout boxes
Battery pack adapters
DC fan and motor setups
✅ Works with any device using standard barrel DC input, especially 5.5 mm × 2.1 mm plugs.
 
✅ Common Uses
🔌 Terminating DC barrel plugs into wire leads or screw terminals
🧩 Adapting power supplies to non‑standard devices
🧪 Supporting prototyping, testing, and field repairs
🧵 Essential entry in the DC power accessory ecosystem
 
🧠 Signal Format
⚡ Input: DC voltage (typically 5V, 9V, 12V, or 24V)
🔋 Output: Pass‑through DC via wire or screw terminal
🔌 Connector: Barrel plug (male or female) → pigtail or screw block
🔁 Not interchangeable with USB, JST, or coaxial power formats
 
⚠️ Things to Watch Out For
📉 Must match barrel size — 2.1 mm vs 2.5 mm inner diameter is critical
🔌 Confirm polarity — center‑positive vs center‑negative before connecting
🧯 Always check voltage and current ratings of the source and device
📏 Screw terminals may loosen over time — retighten periodically
 
🛠️ Quick Tips for Beginners
🧭 Look for “DC IN” label and barrel size on your device
🔌 Confirm connector: 5.5 mm × 2.1 mm or 2.5 mm, male or female
🧪 If device won’t power, check polarity and terminal contact
🧯 Label clearly to avoid mix‑ups in multi‑voltage setups