So I am trying to make a voltage amplifier that raises a intermittently pulsed 3.3V signal to 5V. I've built a circuit based off a diagram I've found:
Let's just say I don't know very well what I'm doing, and I don't know If I've interpreted how to implement the digital ground here correctly. The circuit I have now looks like this:
and generates the correct voltage when R1=1.5M and R2=1K !
The OP amp is an NTE823, and it's powered by 5V DC. I am testing the voltage output with two AA batteries, grounding to the battery and measuring at Vout. What kind of monster have I made?

Let's just say I don't know very well what I'm doing, and I don't know If I've interpreted how to implement the digital ground here correctly. The circuit I have now looks like this:

and generates the correct voltage when R1=1.5M and R2=1K !
The OP amp is an NTE823, and it's powered by 5V DC. I am testing the voltage output with two AA batteries, grounding to the battery and measuring at Vout. What kind of monster have I made?