/diy/ - Do It Yourself

So I come from /ohm/, and I've decided to make a thread about this issue because I don't want to bloat the thread, since this is making my head hurt and I can't stop bumping into new problems.

If you're new to OP amps like me, you can lurk to learn more about them.

The thing is, I have two OP amps, and I want to connect them in series so they share the total gain. The first problem I encountered is the thing must run only with positive voltage. I've found a way to avoid cutting the waveform by rising the reference voltage, so the signal can move up and down in the positive region without reaching saturation (0 and 9 volts), and by using a capacitor at the output I can keep the constant part of the current at the output equal to 0, so any earphones connected won't fry.

The purpose of this is to build a "bionic ear" with hundreds of times the sensitivity of the human hearing.

Now I'm currently stuck with this problem, I have set the two OP amps to act inverting amplifiers, but only the second one is doing that, what is going on here?
The reference voltage has been set to 4.5 for both non inverting inputs to bias the output signal as I said before.

>>806436
Wut, these are supposed to be inverters, why the first one is acting as a non inverter?