What do you mean by "on stage microphone"? Something that's built into the stage?I'm toying an idea of building an on stage microphone.
Assuming you mean dynamic capsules, there are two main sources: the replacement capsules for the usual suspects, Shure, EV, AKG... that are quite expensive (sometimes it is cheaper buying a complet mic and cannibalizing the capsule) and often hard to get, and a multitude of chinese capsules that are on AliExpress.Does anyone know what capsules to look for for this kind of builds?
I still don't understand what you mean by "stage use". About half of the microphones built today are for stage use. What do you want to build that would be so special?It seems to be fairly simple to build a dynamic microphone motor such that is would be robust enough for on stage usage.
Building a half-decent dynamic mic is out of the DIY realm. It involves equipment and tooling in diverse domains such as precision winding, molding plastics and machining.Has anyone here seen some diy builds of dynamic capsules, and well, call me snobby but I might pass on the Mack Gyver kind of builds.
OK. It's one way of seeing things, but actually the frontier is not clear cut. that's why I asked you if there was something else.In the music industry it is common to distinguish between equipment that is designed to be used on stage and (sometimes or) in the studio. Equipment, such as microphones, going up on stage tends to have two features in common, not prone to induce feedback and mechanically robust.
Not only the diaphragm, but the concentricity adjustment. Remember there is a pole piece within the coil. The gap is very small. Working on a dynamic motior is more difficult than a condenser or a ribbon mic.For this build I would have to cnc machine some parts, I don't think I'm able to get the precision with a hand cranked milling machine. The tricky part will be the membrane, or diaphragm. I have to design it such that it and the coil assembly is flexible enough to transduce sound in to a signal. In addition the coil have to be light (Newton's 2d law of motion), at the same time have a healthy ration of number of turn and impedance.
I shouldn't say that, but I bought chinese SM57 replacement capsules (5 for $12). I AB'd them with a real one. I couldn't hear a significant difference. What I mean is they sound a little different, but actually my two genuine SM57's don't sound exactly the same. The chinese ones sound very similar to the Shures. If I had to use them (I have retired them long ago for the benefit of condensers) I would not necessarily reject the chinese ones.Edit, I actually have two knock off Shure SM58 microphones (the sound is sort of good enough for rehearsal studio). You're first post inspired me to look for replacement capsules for these microphones. But ss you said, they come with a hefty price tag, but swapping seems to be done in minutes.