TTL 7400's Available

Brent Hilpert hilpert at
Mon Jan 1 23:13:12 CST 2007

Chuck Guzis wrote:
> This talk of making flip-flops brings to mind a topic not mentioned
> much at all any more--that of AC-coupled logic.  Does anyone own any
> CPUs constructed using this logic type?  I realize it was more common
> when thermionic devices (tubes/valves) were used, but I do recall
> seeing some transistor and tunnel diode circuits using AC coupling.

Are you referring to AC-coupled/triggerred flip-flops (where the clock trigger
is applied thru 2 capacitors to the input of each side of the FF) or to logic
where all signals (gate inputs, etc.) are AC-coupled?

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