Here is the Cliff Notes version on using propane for brazing with oxygen. And you want to use pure oxygen with propane so you can get a nice sharp flame for much finer control. While acetylene equipment can work with propane, propane specific equipment works better. A propane flame is harder to light and stay light. Start by getting a propane specific mixer. They have a different ratio of fuel to oxygen mix. For the Smith torch that is a AT-61 and for Victor and compatibles it is the UN-J. Smith no longer makes propane tips. Victor makes its TEN series that screw onto the end of the UN-J. These tips have a recessed end that helps prevent flame blowout.

The best tips for propane are made by the Paige Tool company for the jewelry trade. These tips have little orifices around the center orifice so those extra little flames sharpen and stabilize the center flame. These tips work great. We (as in the bicycle frame making community) talked them into making adaptors for their tips that allow them to be used with a variety of torch handles and corresponding mixer/elbows. They provide a very sharp flame tip that contributes to precise control.

You also want T rated hose for propane instead of acetylene R rated hose. I recommend the light hose TM Technologies sells and extend its length with standard T rated rubber hose so the tanks are further away from the action.

In the frame builders section of Velocipede Salon, I have written extensively about using propane instead of acetylene for brazing. It has a lot of views so I assume that subject is interesting to a lot more people than hobby framebuilders.