simulate this circuit – Schematic created using CircuitLab
Currently I have the following configuration using the LM358 single rail supply OpAmp. Each individual resistor value has been checked and I am currently receiving both the 15V rail source and the V1 from the same power supply (With both having a common ground).
In simulation I am showing 12.16V output on VoutFinal, but when testing the circuit I am seeing the following results:
Input -> Output .1V -> 2.02V .2V -> 5.00V .3 -> 7.82V
I'm confused, not only are these not the gain I should be getting but the outputs seem to get a different result as the input is changed. What do I seem to be missing?
On the topic of instrumentation amplifiers I had (Burned it unfortunately) and INA128P instrumentation op-amp which required dual rail supply. When I had hooked up the OpAmp to a power supply with dedicated + and - Voltage ports I was able to input .01V and get 1V output (So correctly obtaining the 100 gain of the opamp).
Then when I attempted to use an op amp with no dedicated + - voltage and instead tie - to GND (So then + port is outputting positive 15v) and then tie + to GND (So - port is outputting negative 15v). Not only were I not getting any good results but it messed up the chip.
What am I missing? My ultimate goal is to get a high gain (60-100) while reducing noise as much as possible and having a stable output which an instrumentation amplifier is ideal but I'm a bit lost.