retrolefty:
Yes, 071s would be much better. There is a big problem wiring this circuit to an arduino. The second stage is operating as a simple comparator so it's output voltage will only ever be one of two values, either +15vdc or -15vdc (actually somewhat less as a 741 is not a rail to rail op=amp) and both those value are too high positive and negative, and will damage an AVR analog input pin, which can only handle voltage ranges from 0 to +5vdc.
Lefty
That gives me an idea. What if I wired up the second op amp using the 5V and GND from the arduino for its +Vcc and -Vcc?
I've been trying to test the circuit, but my power supply does not appreciate something I'm doing. After several seconds of activity, the output signals dies. I can get it working again if I turn the power supply on and offf. Recommendations?