> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# DC Power Adapter Barrel Jack

**Type:** Product page · **SKU:** POLOLU-1139 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/dc-power-adapter-barrel-jack.html ([markdown](https://core-electronics.com.au/dc-power-adapter-barrel-jack.html.md))

This is a standard PCB-mountable barrel-type jack for DC power adapters with 2.1 mm center holes.

## Pricing

- **Price:** $2.20 (inc GST) — $2.00 AUD, exc GST
- **Quantity discounts:** 10+ $1.92 (exc GST) · 25+ $1.86 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 6 today, and up to 200 more in 4–7 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-1139:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-1139:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

This is a standard PCB-mountable barrel jack for DC power adapters with 2.1 mm center holes. This jack is compatible with Pololu's wall-adapter power supplies:

| ![](https://core-electronics.com.au/media/remote_images/0J2208.372_P7XAhH.png%3F3072213fb533812ac0216abbcc77b5c9) |
|---|
| Dimensions (in mm) for the DC power adapter barrel jack. |

The jack has three pins: pin 1 comes out of the back of the jack and is connected to the center pole, pin 2 comes out of the bottom of the jack and is connected to the side wall, and pin 3 comes out the side of the jack and is automatically switched based on whether there is anything plugged into the jack. With nothing plugged into the jack, pins 2 and 3 are shorted together; with an adapter plugged into the jack, pin 3 is disconnected. This feature makes it easy to create a system that is powered by a wall adapter when one is plugged into the jack and by a battery the remainder of the time.

For a DC jack that connects directly to a terminal block for easy connection of wires, see Pololu's [DC barrel jack to 2-pin terminal block adapter](https://core-electronics.com.au/dc-barrel-jack-to-2-pin-terminal-block-adapter.html).

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/d/c/dc_power_adapter_barrel_jack__pololu_1139__00.jpg)