We love Jeri Ellsworth’s electronics videos and have missed them of late (as she’s made the move from Oregon to Washington to work at Valve Software). She’s baaaaack! And with a cool, simple circuit for building a 1-bit analog-to-digital converter (ADC) using a single flipflop IC (such as a 74LS*) to do the sampling. If you’re still with me, you shouldn’t have any trouble understanding this tricky little circuit and why it’s cool.

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Gareth Branwyn

Gareth Branwyn

Gareth Branwyn is a freelancer 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 for Boing Boing and WINK Books. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.


  • Ken Corkum

    Where is the video ??????

  • http://rafaelgcpp.blogspot.com Rafael Pinto

    This is not PWM. It is Delta-Sigma Modulation (http://en.wikipedia.org/wiki/Delta-sigma_modulation).

    Classical reference: Gabor Temes and James Candy “Oversampling Delta-Sigma Data Converters: Theory, Design, And Simulation”, ISBN 0879422858