I remember reading an article the discussed how to build a horn type directional microphone. I built a version of it some time ago from that article, does anyone remember that article?, does anyone have a copy?
I thought about that a few years ago, I had a small dish and it was complete, I had taken all the guts out of the "feedhorn" and after a slight struggle, I got the antenna out of it, the remaining opening was almost the perfect size for a 3/8" diameter mic element, never finished it but I have a friend that has a few small dishes laying around. I wonder if a unidirectional element would work better?If you use a "shotgun" mic, it's going to be "tinny", and have a relatively narrow frequency response.
Try using an unwanted satellite dish with an omnidirectional mic. Shield the mic from unwanted input from the sides, perhaps by using an audio insulated cone (picture lots of fiberglass). Place the mic where the original feedhorn was to retain the focus of the antenna.
I read a similar article that used 5 or 6-1/2" diameter PVC pipe sections, but of course I can't find it again. If I can find an real low cost alternative, that will work, so your input to the conversation is welcomeOne of the books I read a long time ago (I think by Forrest Mimms) mentioned a simple unit made of straws cut to various lengths (resonant to acoustic frequencies) and bundled in front of a mic. Is this a shotgun mike, and does it apply to this conversation?
I saw that article years ago it was in one of the electronic project mags, build an Exponential Microphone. Check the web for the exact formula and calculate your curve, connect the points in a smooth curve and shape simple cardboard to the derived curve. I did that, and used some cut cardboard ribs to hold the shape. Painted everything with fiberglass resin and once it set (45 minutes or so) I had a light weight horn assembly that brought all the sound down the horn right to the mic element.I remember reading an article the discussed how to build a horn type directional microphone. I built a version of it some time ago from that article, does anyone remember that article?, does anyone have a copy?
That is "Kind of" how a shotgun mike works, except rather than tuned straws, it uses the wavelength of the sound in a linear fashioin along the length.One of the books I read a long time ago (I think by Forrest Mimms) mentioned a simple unit made of straws cut to various lengths (resonant to acoustic frequencies) and bundled in front of a mic. Is this a shotgun mike, and does it apply to this conversation?
I remember reading an article the discussed how to build a horn type directional microphone. I built a version of it some time ago from that article, does anyone remember that article?, does anyone have a copy?
This is funny to me since my 12 year old just put together a parabolic mic assembly last night out of some parts we had laying around the shop, only using a 3 transistor amplifier for the mic, and the sounds he is picking up is very good and very directional.....An acoustic lens combined with a conical horn can be used to obtain a highly directional microphone without some of the disadvantages of the parabolic microphone. The directional characteristics can be calculated satisfactorily if one assumes that the horn provides uniform flooding of the lens aperture.
by Duane Benson
by Jake Hertz
by Duane Benson
by Aaron Carman