Thanks a lot, for the info. I think I'll try the LM324 if I can get a sample of it (No radio shack here in the UK!) . 3.5V should be OK for testing if things are working, the 10bit A/D is not enough anyway. I'm planning to get a 16bit A/D for it eventually.
Perhaps I should start a new thread for Frequently-Used A2Ds. I've got a 16bit AD7792, which works great but is too complicated to interface with. Anyone know a simple to use >16bit A/D that comes in a convenient DIP package?
I need some kind of a instrumentation amplifier to get a pressure sensor to output 0-5V. It's basically a Wheatstone bridge with strain gauges. I am at a loss of which OpAmp to use, since there are like millions of them. I need one with a gain of about 500 - 1000, can operate at 5V so I can power it with arduino, and does not need negative voltage. I'm not a EE, I've only ever used OpAmps in one lab at school (the 741), what OpAmps do people usually use in the real world? Where can I get one?
I've ordered more than half a dozen of those things from Paul. They all had small transistor-ish regulators. Send him an email if you are worried, sometime he's busy. I don't think this is his full time job...
Can anyone explain what's going on? It seems like I only hear the radio if the microphone is attached. And the microphone wire is acting like an antenna, since the audio quality changes if I move it around.