> I like the single transistor circuit in your link, but I wonder if it will
> work with  5.5V DTS power source (battery powered terminal)

You might want to try philips semiconductor web site for single logic gate
in SMT form, but breethe softly when handling them.  If you are looking more
for 8pin dip as a buffer, or only for buffering so to protect the uP than
there are other options and ways to implement them.

Cheers, ling sm

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