While there are many pre-built solutions out there if I had the money to throw at it I thought I'd pick a few brains here to see if anyone might know of or could help trigger my mind into figuring out a way to do this inexpensively.
What I need would commonly be known as a voltage controlled air pressure regulator but could simply be a tiny orifice the size of which is varied by a contol voltage.
I've got a 25 psi compressed air supply that I'd like to be able to adjust from between 0 to at least 20 psi on the output by applying a 0 - 10V or so control voltage. The cfm/volume of the output would be extremely low, almost a static value, so a divider setup composed of fixed and variable orifices would work out just fine so long as it doesn't consume (waste) a lot of air in doing so.
The closest thing I've come up with involves a tiny orifice feeding a small storage tank and the smallest automotive fuel inector I can find controlled by PWM as a bleedoff device to keep the pressure in the tank at the desired value.
Although it would work I can see several potential problems with this idea. First of all it might tend to be too noisy for the environment I want to use it in and the fact that most fuel injectors are going to flow a lot of air even at a very minimal duty cycle. I suppose that could be handled by installing another orifice in series with the injector but there's bound to be a better idea. If I knew of a tiny air comressor that would vary its output by the voltage you drove it with that might also work, but at the moment I'm just wanting to see if anyone else may have some thoughts on this.
What I need would commonly be known as a voltage controlled air pressure regulator but could simply be a tiny orifice the size of which is varied by a contol voltage.
I've got a 25 psi compressed air supply that I'd like to be able to adjust from between 0 to at least 20 psi on the output by applying a 0 - 10V or so control voltage. The cfm/volume of the output would be extremely low, almost a static value, so a divider setup composed of fixed and variable orifices would work out just fine so long as it doesn't consume (waste) a lot of air in doing so.
The closest thing I've come up with involves a tiny orifice feeding a small storage tank and the smallest automotive fuel inector I can find controlled by PWM as a bleedoff device to keep the pressure in the tank at the desired value.
Although it would work I can see several potential problems with this idea. First of all it might tend to be too noisy for the environment I want to use it in and the fact that most fuel injectors are going to flow a lot of air even at a very minimal duty cycle. I suppose that could be handled by installing another orifice in series with the injector but there's bound to be a better idea. If I knew of a tiny air comressor that would vary its output by the voltage you drove it with that might also work, but at the moment I'm just wanting to see if anyone else may have some thoughts on this.