Adafruit
Female DC Power adapter - 2.1mm jack to screw terminal block
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A simple adapter that converts a 2.1 mm DC barrel jack to screw terminals, making it easy to connect a DC power supply to boards or projects that lack a DC j...
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A simple adapter that converts a 2.1 mm DC barrel jack to screw terminals, making it easy to connect a DC power supply to boards or projects that lack a DC jack. The terminals are labelled with positive and negative polarity, assuming a centre-positive configuration (the most common type).
Key Features
- 2.1 mm DC Jack – Standard barrel connector input
- Screw Terminal Output – Secure, solderless wire connection
- Polarity Labelled – Positive/negative markings for centre-positive supplies
Package Contents
- 1× Female DC power adapter (2.1 mm jack to screw terminal)
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- DC barrel jack
- A round power connector commonly used for low-voltage DC power supplies, often described by its outer and inner diameters such as 5.5 x 2.1 mm. Matching the barrel size and polarity is important so the plug physically fits and powers the device correctly.
- screw terminal
- A connector that clamps bare wire using a small screw, making it easier to attach and remove wires without soldering. Screw terminals are useful for power wiring or thicker wires that are not suited to small plug-in connectors.
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