Popular Electronics Classics: Ultrasonic Sniffer

Popular Electronics Classics: Ultrasonic Sniffer

About this March, 1963 feature, Popular Electronics asks, “How would you build this circuit today?” Share your ideas in the discussion section. Note also that we’ve retained the old conventions used in the original, e.g., kc versus MHz, μμf versus pf, r.f. versus RF, etc. *** Here’s an old circuit with a...

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