Short Circuit #2: Frequency multiplication with tank circuits

Education Technology

Here’s day two of Jeri Ellsworth’s, aka Circuit Girl, video lab journal, Short Circuit. In this one, she discusses frequency multiplication with tank circuits.

Fat Man and Circuit Girl

Jeri Ellsworth and Short Circuit #1

6 thoughts on “Short Circuit #2: Frequency multiplication with tank circuits

  1. noah anderson says:

    That’s very cool and stunningly clearly explained – thank you!

  2. japroach says:

    good stuff

  3. Jonathan Foote says:

    Sorry, That’s not frequency multiplication, that’s just filtering out harmonics from a pulse train. The tank circuit acts like a 800 kHz bandpass filter. True frequency multiplication will allow *any* output frequency, not just the LC resonant frequency, and typically requires nonlinearity.

    The right way to look at this is in the frequency domain.

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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. His free weekly-ish maker tips newsletter can be found at

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