Once upon a time—my gosh, it was 30 years ago—a guy asked me if I could show him how to make a Frequency-to-Voltage converter (FVC). Well, at that time, at George A. Philbrick Researches, we knew a lot about analog computers and we figured we could convert almost any signal to any other form or mode. So I designed a charge-dispenser made of a voltage limiter, a capacitor, and diodes. I built it up, and it worked pretty well....
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