NASA NTRS · 19770000021
Logic-state-change indicator and frequency doubler
Abstract
Low-power TTL circuit produces an output pulse whenever logic level at its input terminal changes. Circuit can also be used for doubling square-wave frequency.
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Hudgins, J. I.. 1977-06-01. Logic-state-change indicator and frequency doubler. https://ntrs.nasa.gov/citations/19770000021
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