Hint M3 - Mains-powered 12v motor

This motor is powered from the mains via a 12v adaptor, and is ideal for situations where you need maximum power, or where you want to have a K'NEX model running for long periods of time.

The 12v motor is included in some large K'NEX sets such as the 6ft (1.8m) Ferris wheel. It needs a 90983 K'NEX Gear White to operate.

You can buy the 12v motor and gear wheel in our K'NEX shop.

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If you live in the USA, the UK or mainland Europe, you can also buy a 12v mains adaptor from us to operate your 12v motor.

However, if you wish to buy your own adaptor locally, they are usually readily available from online suppliers of low voltage electrical products.

We are advised that the adaptor specification is as follows:

Input voltage: As per local requirements (eg 120v 60Hz for USA)

Output voltage: 12V DC

Output current: Between 500mA and 1A

Output plug dimensions: Minimum length 10mm (0.393 inch), Outer diameter 5.5mm (0.217 inch) approx., Inner diameter 2.1mm (0.083 inch) approx.

Output plug polarity: The manufacturers of K'NEX have supplied adaptors for the 12v motor over the years which have either a "centre positive" or a "centre negative" polarity. The polarity determines whether the motor turns clockwise or anticlockwise. This probably does not matter for a Ferris wheel, but will make a difference if the motor is driving (for instance) a chain drive on a roller coaster. See Handy Hint M17.