Science Technology

It’s the McLVDT, a linear variable differential transfomer, made from McDonald’s straws. The creator writes:

I made a primary coil on a normal sized straw, and made two secondary coils on the outside of the larger McDonald’s straw. Since the McStraw is large-bore (perfect for those thick high calorie shakes), the smaller straw with the primary winding fits nicely inside. The position of the inner straw can be determined by examining the amplitude and phase of the combined signals of the secondary coils, which is shown in raw form on the oscilloscope.

“Mc”LVDT

10 thoughts on “Make an LVDT with soda straws

  1. If you live in a town big enough to have a place to buy Bubble Tea, buy yourself a tasty beverage. And save the straw. If you think the McDonalds milkshake straws are large-bore, you’ve never enjoyed Bubble Tea.

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Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.

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