[sdiy] Inverting amplifier for DC?

[Amos]

Help, O knowledgeable ones!

I have a very simple question.

I have done a lot of repair work but very little modification or custom work
thus far.

I am now trying to do a trivial thing and need some help with
troubleshooting...

I want to take a +5V gate signal in and get -5VDC out when it triggers.
So, I figured an inverting unity-gain amplifier would solve my problem.

I have built the standard textbook inverting amp, using half of an RC4558
opamp IC
it doesn't seem to be inverting... output == input, more or less.

input and feedback resistor are both 33 ohm
input is to negative (inverting) in, feedback is from output to inverting
input.
non-inverting input is grounded.  Power is +/- 12V; trigger input is ~5V.

Is the "textbook" circuit too simple; is there more I should be doing?
What's up?

Thanks for any help....

-Amos (accentuating the negative)
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