Hello all,

I am just trying to simulate an inverting op amp in TINA. If you are not familiar with TINA, it is TI's free SPICE-type simulation program that you may find just by googling.

I know the math behind op amps, but I can't make them work in simulation or with my breadboard!! This is not a homework assignment--I just want to understand what I am doing wrong

If you have the TINA program and can look at my attached simulation and tell me what I am doing wrong, I would be most grateful. And take it easy--I'm a noob.

 

your dc offset on the signal generator is set to 10V..... drop it to zero volts and the circuit will perform the way one would normally expect.

Remember your DC offset will be amplified by the gain of the circuit as well as the AC.
Remember, your reference +Vin is at ground, so your expecting your signal to vary about ground.

The first graph varies about zero. The second varies about 1.5V

 

Thank you! This is going to take me a while to digest. Will update...