A simple way to test op amps
I don't have a bench power supply so I take the 7 voltage that I have, I used a resistor divider to create 1 volt max; around 900 mV and send that into the op amp's inverting input. I ground the non-inverting input.


That won't work. As soon as the inverting input goes higher than the non-inverting input the output is driven as far negative as it can go. This will be close to 0 V as you found out.







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. Reconfiguration as a voltage follower.


We use negative feedback so that the output will follow the voltage on the non-inverting input.
Your 100 &Omega; test load is too low for most op-amps. I've increased it to 10k.
-Your R1 and R2 values could be increased by a factor of 100. The op-amp has a very high input impedance so it doesn't need to be fed from such low value source.
Once you have this working have a look at non-inverting op-amp circuits and see if you can modify it for a gain of two.




Figure 2. Extract from the datasheet.


The op-amp characteristics are measured (unless specified otherwise) at &pm;15 V.
The op-amp can operate from &pm;5 V to &pm;24 V so your 7 V supply is too low. You'd need 10 V.
With a &pm;15 V supply the inputs can only be allowed to go to &pm;12 V. In other words, it can't operate and closer than 3 V from the supply rail. Your 900 mV is way to low.
The output is similarly restricted. You won't get closer than 3 V from the negative supply rail.


You need a better power supply for your purposes. Two 9 V batteries would do.