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From: "Ken Taylor"
Subject: Re: 74HCT output to cable
Date: Fri, 10 Jan 2003 16:22:26 +1300
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"Kay" wrote in message
> I haven't found any 74HCT in the local electronics store so I bought a
> 74LS90. I am using it as a decade counter to reduce the frequency. The
> socket the output signal from 74LS90 needs to go in supports 3.5mm stereo
> jack. So I bought a 3.5mm stereo jack with a 12feet extension cord from
> radio shack. There is no specification on the plastic bag with the cord so
> don't know anything you've asked. Maybe I should just go ahead and try
> connect them together directly?
> BTW, the load is a TTL 5V compatible device that will use the 74LS90
> as an external sync.
Trying is easiest, it still depends on too many unknowns to give you an
answer about whether it'll work or not. If it doesn't, *then* we're going to
need more data! :-)
Either way you won't damage anything.
> > Kind of broad.
> > 74HCT what? Some are capable of driving cables, some are not.
> > What kind of cable and how long? Do you know the what the
> > attenuation per unit length is? Do you know what the capacitance
> > per unit length is? The characteristic impedance?
> > What does the signal you want to push down the cable look like?
> > What does the load look like?
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