How do you determine the size of the series resistor???

Gabriel

>
>
>        How about a current limit resistor in series with the input (if
>the signal going into the input is not too fast?).  I've brought 74HC
>lines out of the box into the real world by having a resistor between the
>input and the rear panel connector, a pull-up resistor from the connector
>to +5V.  For RF filtering, there was also a 56nF capacitor to ground on
>the internal circuitry side of a ferrite block (connector to ribbon cable
>thru ferrite block, caps to ground, pullup to +5V, series current
>limiting resistor to 74HC input).  This has survived at broadcast
>transmitter sites that tend to attract lightning.
>
>
>Harold
>
>
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>
>Harold Hallikainen
>harold@hallikainen.com
>Hallikainen & Friends, Inc.
>See the FCC Rules at http://hallikainen.com/FccRules and comments filed
>in LPFM proceeding at http://hallikainen.com/lpfm
>
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