On Wed, 1 May 2002, Douglas Butler wrote:

>Capacitors tend to create constant voltage.  Inductors tend to create
>constant current.  If there is an interference spike it will have both
>voltage and current transients so both capacitors and inductors will
>oppose it.  Unfortunatly digital circuitry tends to create its own
>current spikes, so an inductive source to a logic chip is bad.  When the
>chip needs to draw more current a capacitive supply supplies the current
>to maintain a constant voltage.  Logic could be designed to work with
>constant current instead of constant voltage in which case inductors
>would see more use.

As in ECL ? ;-)

Check your position on filter inductors. There are millions of them in
consumer equipment, probably some in the motherboard of the PC you're
using right now ...

Peter

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