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DC to DC Adapters, also called Car Adapters, provide a similar function as AC to DC adapters, only they operate off of vehicle 12-volt DC power, rather than 120-volt AC power, and use a cigarette lighter plug for connection. Otherwise, selection of a car adapter is the same as for an AC adapter.
Selectiing an Inverter
When selecting a DC adapter, you need to know the input voltage. current consumption, tip-size and tip polarity for your electronic device. This information is often on a label on the back or bottom of the device, and is usually in the format described at the links below:
The tip size may or may not be provided; however, if it is not listed on the device or in the manual, you can easily determine the correct tip by taking the device into your local RadioShack, where a full range of our Adaptaplug tips is available. There are "test tips" corded and attached to the display area for power converters in order to allow customers to determine which plug fits their device(s). If you need assistance, a store employee can help you.
When selecting your AD adapter, you need to match the voltage, tip polarity and tip size exactly; however, the adapter only needs to match the current consumption as a minimum. Because a device will only pull as much current as it needs, and because adapters are rated at the maximum current that they can provide, there is no problem using an adapter which is rated at a higher current than is required by your device.
If you have a number of devices that need car adapters, we have a worksheet that will make the selection process easier. Print out the worksheet, fill it in as much as the information is available, then take the worksheet to your local RadioShack store, along with any devices for which you do not have a plug size.
Cautions
- Do not use a power converter of any type for critical equipment such as medical devices unless so advised by the equipment manufacturer.
- Do not use a power converter of any type if you are not sure of your equipment's power ratings; contact the manufacturer for this information.
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