My generator will output a 20Vp-p sine wave, resulting in a 7Vrms AC voltage (10V * 0.7) I want to boost this to >=12Vrms AC and I thought an Op Amp would do that; if I use a gain of x2 that would suffice for my purpose. The problem is I can't get it to work and I suspect I'm doing something stupid that I just can't see. The Op Amp I have is a TI UA741
I don't care about quality nor if the signal is clipped - common mode input voltage range is +-13V at 15Vin and I could increase Vin to +-18V. At the moment, I'm getting a wholly unexpected output which makes me think I'm doing something wrong. I originally thought it was because I'd got the ground wrong but when I change the ground point of the Op Amp output to the Ground of the Function Generator, it still doesn't work AND channel 1 of the PSU oscillates between 0V and 32V!
Is there a better way that I can do this with parts that I might have at hand? Ultimately, I want to be able to variably alter the output voltage level to amounts < 12Vac and alter the frequency (hence why I thought using my frequency generator was a good idea)