Folks,
I need to generate pressure pulses of 3-4psi above ambient, frequency around 1Hz, more or less arbitrary waveform with frequency components up to 40Hz in there (but those are less than 2psi) and delivered via short hose. Currently just air pressure.
I got this (sort of) running with a compressor but after a while my ears fall off from all that noise. Can't really place the compressor outside here. So then I tried various speakers. They don't move enough air around. When I pushed one of them a bit harder a few minutes ago its flexible surround rubber burst, that thin stuff doesn't hold much pressure.
In other words I need something similar to an arbitrary function generator but where the output is air pressure. What I want to avoid is hacking a motor, removing a valve and using the piston.
Any other ideas? Can one buy something like that at less than 4-digit prices?