I've mentioned a time or two that my spray setup is kind of weird. I finally thought to take a picture of it, and here is how it works:
My compressor is a 5-gallon Porter-Cable "General Purpose" compressor that is situated about 50' from my workbench. It has a regulator and moisture trap on it, and I keep the regulator set to about 75 psi.
Air comes from the compressor through the orange hoseon the right side of the photo. It goes through a moisture trap (for reasons explained below), and into a "T" fitting. A hose is connected to the bottom of the "T" and to a standard blow gun so I always have high-pressure air available for blowing off my bench or cleaning my airbrush. The other side of the "T" goes to a regulator for my airbrush. I can set that at low pressure and still have high pressure at the bottom of the "T".
I also have a compressor at my bench, but it's noisy and doesn't have a tank on it. I use it when I just need a shot of air to blow something off and don't want to fool with waiting for the big compressor to pressurize. That one doesn't have a moisture trap or tank, and it blows a LOT of water out which is why I have a trap at the bench.
Everything has quick-disconnect fittings so I can change compressors, tools or hoses easily. Total cost was around $75 or so and it's worked well for a long while.