how do you record audible sound, and play it back as infrasound ?

An unusual task, I know nothing. I was told I need a heterodyne circuit.

oseriph05-24-2016 1:57am

oseriph OP Details Discussions Posts This discussion Message User 1 posts 07-02-2016 at 08:44pm Copy Comment URL Report Comment Edit Delete Experiment. examining the range of corvid hearing. I'll need to do the same with ultrasound.