Connecting Lm2904P

Hello!
I Have problem with lm2904p op amp.
I connected it using this schema:
As i know, output should be -3.3V in this case, but I have 0.81V…
What I am doing wrong?
(2, 3, 8, GND - lm2904 pins)

lm2904.png

barns:
As i know, output should be -3.3V in this case, but I have 0.81V...
What I am doing wrong?

How could the op-amp have a negative voltage output without being connected to a negative supply voltage?

How could the op-amp have a negative voltage output without being connected to a negative supply voltage?

I see… My mistake…
But, anyway, it is 0.8…

barns:
I see... My mistake...
But, anyway, it is 0.8...

And you expect it to be, I guess, "0"?
0.8 is about as close to Gnd as that particular op-amp will go.

Your op-amp, as shown, is configured as an Inverting amplifier.

If you connect the input to +5 then the output will be nearly Gnd.
If you connect the input to Gnd then the output will be nearly +5V.

barns:
Hello!
I Have problem with lm2904p op amp.
I connected it using this schema:
As i know, output should be -3.3V in this case, but I have 0.81V…
What I am doing wrong?
(2, 3, 8, GND - lm2904 pins)

Simple:

a) You have it configured as an inverting amplifier so it went low when you expected it to go high
b) It isn’t a “rail to rail” opamp so 0.8V is as low as it can go.