Op Amp Hookup Help Please



I'm not an experienced electronics person, and so have a "stupid question".
I have a device that provides an "on" signal intermittently at 2.7 volts DC.

When the "on" of 2.7 volts is available, I need to have a "sub-circuit"
receive an "on" of 5.0 volts. I have a source of 5.0 volts on the board.
I've been told I need to use an op amp to do this, so I bought two NTE 928M
op amps. I've tried to get this to perform as I need, but can't. HELP
please!!! I put resistors in somewhere, but where and how big?
tanksalot
S.F.

.



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