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18V DC Power Adapters and Power Supplies
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18V DC Power Adapters and Power Supplies
Shop 18V DC power adapters and power supplies at Aus Electronics Direct. Our range includes compact and switchmode power adapters with different output current ratings and DC plug configurations for compatible electronic devices.
Choose from 18V power adapters with 1.33A, 1.6A, 2.8A and 3A outputs. Options include standard 2.1mm DC plugs and reversible 2.1mm or 2.5mm connectors, providing flexibility when replacing an existing power supply.
An 18V DC power adapter can be used with compatible electronic equipment, including selected modems, clocks, printers, LED lights and security cameras. Always check the manufacturer's power requirements before choosing a replacement.
When selecting an 18V power supply, confirm that your device requires 18V DC and that the adapter provides sufficient current. Check the DC plug's inner and outer diameter, polarity and other electrical specifications to ensure a suitable connection.
Whether you need a compact 18V adapter, a regulated switchmode power supply or an 18V adapter with a reversible DC plug, browse our range to find a suitable power solution for your equipment.
FAQ
18V DC Power Adapter FAQs
1. What is an 18V DC power adapter used for?
An 18V DC power adapter converts mains AC electricity into an 18-volt direct current (DC) output for compatible electronic devices. It can be used to power selected networking equipment, audio products, electronic instruments, control systems and other devices that require an 18V DC external power supply. Always check your equipment's input voltage, current requirements, connector dimensions and polarity before choosing an adapter.
2. What is the difference between an 18V 1.33A and 18V 1.6A power adapter?
Both adapters provide an 18V DC output, but they have different maximum current capacities. An 18V 1.33A adapter can supply up to 1.33 amps, while an 18V 1.6A adapter can supply up to 1.6 amps. The 1.6A model can support equipment requiring more current, provided the voltage and other electrical specifications match. Choose an adapter with a current rating that meets or exceeds your device's requirements.
3. Can I use an 18V 3A adapter instead of an 18V 1.6A adapter?
Generally, yes. An 18V 3A power adapter can replace an 18V 1.6A adapter if both provide the correct 18V DC output and have compatible connector dimensions, polarity and other required specifications. The 3A rating indicates the maximum current the adapter can supply; it does not force 3 amps into the device. Always confirm compatibility with the equipment manufacturer's requirements before connecting the replacement.
4. How do I choose the correct 18V power supply?
To choose the correct 18V power supply, check your device's specifications and confirm the following:
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Output voltage: The equipment must require 18V DC.
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Current rating: The adapter must provide at least the current required by the device.
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Connector size: Check the DC plug's inner and outer diameters.
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Polarity: Confirm whether the device requires centre-positive or centre-negative polarity.
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Power supply type: Check whether the device requires a regulated adapter or any other specific power-supply features.
Matching these specifications helps ensure the replacement adapter is suitable for your equipment.
5. What is the difference between a 2.1mm and 2.5mm DC plug?
The main difference is the internal diameter of the DC barrel connector. A 2.1mm plug has a smaller internal contact opening than a 2.5mm plug. Although the two connectors may have the same external diameter, they are not necessarily interchangeable. Using the wrong size can result in a loose connection, poor electrical contact or an unreliable power supply. Check your device's required connector dimensions before purchasing an 18V adapter.
6. What does a reversible DC plug mean?
A reversible DC plug is a connector that allows the output polarity to be changed, typically between centre-positive and centre-negative configurations. This can make one power adapter suitable for different devices with different polarity requirements, provided the voltage, current and connector dimensions also match. Always check the polarity diagram and configure the plug correctly before connecting the adapter to your equipment.
7. Can I use an 18V DC adapter with a device requiring 18V AC?
No, not unless the equipment manufacturer explicitly states that it accepts both AC and DC input. An 18V DC adapter supplies direct current, whereas an 18V AC power supply provides alternating current. Although both are rated at 18 volts, they are electrically different and are not generally interchangeable. Using the wrong power supply may prevent the device from working or cause damage.
8. What devices use an 18V DC power adapter?
Some electronic devices use 18V DC power adapters, including selected networking products, audio equipment, electronic instruments, control systems and specialised electronics. However, devices within these categories may require different voltages, current ratings and connector configurations. Always check the manufacturer's specifications to confirm that an 18V DC adapter is compatible before connecting it.
