I've seen a similar question asked earlier here: How do I bias an AC signal for sampling?
However, I have a 3 different circuits and I am not sure which one works best!
I have: +-2V AC signal of varying frequency (5hz to 10kHz). It is biased around 0V.
Objective: Shunt this signal from 0V to 3V, so the output is 1 to 5V signal (the same +-2V just biased around 3V) like demonstrated here:
Solution 3: Three Non-Inverting Unity gain Op-Amps Why? Well, the AC signal source has some impedance, so to avoid any discrepancies on the summing op amp input, I thought it would be logical to put both the AC and DC components through unity gain buffers first...
All three circuits work and the output signal is in fact 1 to 5V in all three cases. Which solution is the best?