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Data on a super shotgun mike from 1960? Answered

I am looking for info on a directional  mike design from 40 years ago I cant find a thing on. It used 20 or 30 lenghts of conduit 20 to 40 inches long bundled together. The effect was to add their resonant effect. I beleive it was directional as well and called a shotgun mike.

Was in pop electronics type magazines.


I know exactly the one you are thinking about.  It's from about 1965.  The article that I read was built using an amp, mike and 1/4 " alum. tubing that was made for coffee makers.  The tubing was cut in progressive lengths each an inch longer than the last and wrapped in a spiraling pattern.  The mike was fixed to the flat end of the bundle and in a somewhat sound proof enclosure.

I don't remember many of the exact details though.  I don't think it was pop science.  It might have been pop mechanics, science and mechanics, mechanics ill, or pop electronics or maybe electronics ill.  Those are what I was reading in '65.  And Mad mag.

I've seen a reference to PoP Electronics 1966.

Here's a link to an ehow version.

Here's an updated version of the one we are thinking about.

Here's a text article detailing some of the theory and design.

Good luck and make an instructable.

The PDF article from 1965 attached to the page in your second link is way cool, even if it's not the exact one the OP is thinking of. Much better than the dish mic I once made out of a mixing bowl, anyway....

A made a parabolic mike using a parabolic "snow sliding dish" from Sears one year.  It worked great but was too big (20" in dia.) to lug around much.  And I didn't have a very good tape recorder at that time.

The mixing bowl mic's performance peaked at a solid "Not bad". Which (considering that I eyeballed the whole thing, used no math at any point, and built it out of old junk I had laying around) was actually pretty good.

My design basically hung a mike on a threaded rod.  That way I could move the mike back and forth until I reached "perfect" focus then locked it down with a wing nuts.

Mine involved coat hangers and duct tape. Tape, test, curse, reposition, repeat.

In the early 80's there were plans for a shotgun mic using 4 inch PVC. It had a small circuit to amplify the sound and feed it into headphones. I built one and still have it in a corner somewhere. It worked very well. I could have someone stand around 50 feet away and whisper and I could easily here them. I believe the circuit used a op amp, a couple of resistors and a pot for gain adjustment.