I had one of the learning experiences last night where you set out to learn one piece of the puzzle, and the answers to that one piece cascade into solving other problems as well. It started with not knowing how to bias an op amp with a single sided supply, and ended up showing me that you can create bandpass filters on op amps with single sided supplies that have output signals at V/2. So I can get everything in one shot!

While searching I came across an application note from Texas Instruments, A Single-Supply Op-Amp Circuit Collection. Of all the pages and app notes I read, that one was the best I found at not only explaining single sided supplies, but showing how they were applied. On page 17 is a multiple feedback configuration of a bandpass filter.  I seem to have forgotten that it's possible to use the feedback from the op amp to filter.  Originally I was planning on a low pass filter followed by a high pass filter.

Another cool thing I came across was Erik Cheever's Single Supply Op Amp Design. I know it's been a long time since I was in school, and as an ME I may not have been as interested in electronics back then, but I never quite got why I might want to use an inverting op amp rather than a non inverting one. This page explained that in an inverting configuration, there is no current going to ground. So it makes a better choice when you are using a single sided source because that current can wind up changing your reference voltage. It was like a light-bulb went off.

Finally, I can across two online calculators that let you design filters. The first was WEBENCH from TI and the other was Analog Filter Wizard from Analog Devices. They show a lot more depth to the choices between configurations. Who knew there was roll off and ripple to worry about? It also looks like I might need more than one op amp, although I want to stick with one if I can.