Hey, all. Greetings.
I'm trying to build a strobe controller for a physics experiment. The arduino end is working perfectly. I have a sketch set up to fire the strobe when I want to, sends pin 12 from low to high, output verified with DMM.
Problem is the op-amp circuit. I have a TL082, and want to produce a 0-9v swing on output (not 0-5). So I tried using a common ground and a 3x non-inverting amplifier. This produced a constant 7V output regardless of the state of pin 12 (which was hooked into the +input for the amp.) So then I tried making a virtual ground at 2.5 v, using the other side of the op-amp and resistors from ground and V+. Hooked up the amplifier to reference virtual ground, so 0V on pin 12 should push output to negative saturation, and 5 into positive saturation. Still doesn't work, getting that flat 7V again.
Any experienced hands out there with a simple op-amp circuit to increase the voltage output from the arduino board? Would like to have this working for a class I'm teaching in 3 days. It should be possible to make this work without a dual supply, but I can use 2 9V batteries and do that if I have to.
Any advice appreciated - thanks in advance.