Hi, I've a voltage change 3-4 Volts which I need to change into a 0 to 4 Volt signal. I have used an inverting op-amp with a virtual ground to give a cracking result but unfortunately the voltage is going the wrong way (decreasing instead of increasing.
I have changed to circuit over to be a non inverting amplifier but I'm worried about the virtual ground. I've been told that summing in a non inverting op amp can be difficult. I took the series resistors out of the circuit from my virtual ground (created from a pot) and from the voltage that I'm amplifying. I have a 560K feedback and 220K to ground giving me a gain of around 3.5.
Will I have problems with the virtual ground being amplified to or any other problems?
Many thanks in advance.