Contact Microphone advice
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I saw in a documentary a researcher recording the sound of insects with a contact microphone. His preamp must have been strong, he would attach the piezo to a branch and record the vibrations produced by a grasshopper. Amazing! I'd like to do the same.
My (discrete) preamp is quite modest. Input impedance is 2.2K and the maximum gain around 50, which I use for electrets. I'd like to plug a contact microphone to it, but I'll probably need a higher input impedance buffer and amplifier to mediate. I've been thinking to build a small box with a 3.7V li-ion battery and a low voltage opamp with some gain as buffer/preamp. I have experience in audio circuits, but zero in this kind of microphones.
Any ideas, advices, or guidelines to achieve what I want? I've decided to ask before doing too much research first. I'm also open to ready made active solutions, but rather on the low cost area.
Best regards, Domingo
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