I am creating a propane "regulator" which allows the user to connect a speaker output to control a valve (0-10V max:0.185A) which opens more with higher voltage.
Here's a video of it operating (WARNING VERY COOL).
This is the valve.
It also has a bypass past the valve to allow a steady flow when no music is on.
The valve opens the most with high bass input because the voltage is higher across the subwoofer input line and the valve is opened for longer because the signal is lower frequency giving a very nice bass effect. The valve opens on either positive or negative signal but does so quickly (but not as fast as the 20-20k hz signal it's getting so I also installed a Rectifier so that the valve doesn't have to adjust open-to-close-open it can just stay in the open state as long as the wave is still occurring).
I'd like to:
a) make it more sensitive to other frequencies (I'm getting a different valve that allows me to vary the gain of the valve). But other ideas are welcome.
b) add some way to increase the voltage to just the valve so that the music volume or bass gain doesn't have to be high in order to get a good effect of propane release. I think that ideally a user might be able to adjust a potentiometer that would control the gain or even adjust it with an app on their phone. One concern is that the voltage doesn't get over say 12V or it might damage the valve, so I assume I might need some sort of regulator in case the settings are off.
c) know which type of input I should use for controlling the valve/circuit to make it most universal for users to hook the system up to any stereo system they like. I'm currently just using the spring clips for speaker wires but I was thinking that some way to hook up to the preamp output signal would be great (but that's very low voltage and would certainly require some voltage multiplication or something)
I've filed a patent over the basic structure in case anyone's worried that this would constitute public disclosure (I love this community for being so happy to help by pointing out things like that in the past).
Thank you in advance. This has been a stumbling block for me.