How does one build a shotgun microphone? - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th November 2008, 02:27 AM   #1
diyAudio Member
 
Join Date: Mar 2005
Location: Van Nuys, California
Default How does one build a shotgun microphone?

I would like to build a shotgun microphone but cannot seem to find any information anywhere. (Not a parabolic type, for which there is much DIY info, but the conventional long tubular type used in tv/film.) Obviously, lots of design engineers working for established companies (Sennheiser, Azden, Audio-Technica, Shure, etc.) have it down to a fine art, but they're not talking.

Obviously, one could reverse-engineer a good microphone and fake it, but it would leave a lot of unanswered questions about the art/science behind these designs. For example, would one use an omni or cardioid capsule? What should the dimensions of the tube be, and what are the the trade-offs? How do those vents on the sides work? What controls the pickup pattern? The frequency response? Etc. Thanks much.

Scott Morrison
Van Nuys, CA
  Reply With Quote
Old 18th November 2008, 04:43 AM   #2
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
Good question! The long tube has slots in it to cancel the rear waves. Figuring that out might be hard.

Years ago my uncle built a very strange "shotgun" mic.
It was about 3" around, and composed of a series of small tubes. Each was longer than the next, so you had a spiral barrel with the longest tube in the center.

It worked.....
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 18th November 2008, 05:42 AM   #3
cbdb is offline cbdb  Canada
diyAudio Member
 
Join Date: Oct 2008
Location: Vancouver
this is not an easy task. Your basically building an acoustic filter thats directional. For higer freqs a reflector (looks like a small satelite dish) will work and much easier to design
  Reply With Quote
Old 18th November 2008, 11:20 PM   #4
diyAudio Member
 
Join Date: Mar 2005
Location: Van Nuys, California
Thanks folks for the responses. Yes, I recall seeing the spiral tube array many years ago.

I agree that figuring it out (from scratch) might be hard, especially for a math-challenged guy like me, but I would assume there are some basic straight-forward design equations published that could be used to determine the physical characteristics of the tube (length, diameter, placement/size of slots, etc), which in turn would be dictated by variables such as desired frequency response, capture ratio, and so forth.

I would imagine equations would also exist for the spiral tube type (how many tubes, what length, what diameter) and the parabolic reflector type (size dish, focal point).

Meanwhile, the search goes on...
  Reply With Quote
Old 18th November 2008, 11:56 PM   #5
diyAudio Member
 
Join Date: Sep 2001
Location: Northern California
Panomaniac,

The one your uncle built from your description would be a published project from Popular Electronics in about 1966. Used a small speaker element in a household funnel coupled to tubes between 1 inch and 30 inches long. Yes it worked, to some extent.

Cyclotronguy
  Reply With Quote
Old 19th November 2008, 12:02 AM   #6
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Hey cyclotronguy you are supposed to be busy building speakers....

Jam
Attached Images
File Type: gif co_fi080.gif (44.6 KB, 695 views)
  Reply With Quote
Old 19th November 2008, 12:25 AM   #7
Mark Kravchenko
diyAudio Member
 
mwmkravchenko's Avatar
 
Join Date: Jan 2002
Location: Perth Canada
Default This may help

Hi scottman

If you know how to make a printed circuit board I have a file that you might find usefull from Elektor Electronics 1997 Directional microphone with headphone output.

Mark
__________________
Mark
www.kravchenko-audio.com
  Reply With Quote
Old 20th November 2008, 09:57 PM   #8
diyAudio Member
 
Join Date: Mar 2005
Location: Van Nuys, California
Hi Mark,

I really appreciate the Elektor directional microphone circuit offer. Yeah, I'd be curious what that's about. Do you have a general idea of what it consists of? Is the microphone portion of the unit a tubular shotgun type or a parabolic reflector type?

I should mention that the shotgun microphone information I am seeking is more mechanical in nature than electrical (i.e., vented hollow tube), other than what exists in the mic capsule itself.

I have a number of omni and uni-directional electret condensor capsules on hand, most of which I bought from Digi-Key for about $2 each. Ideally, I'd like to build my own poor-man's version of the tv/film "industry standard" Sennheiser MKH416 (>$1000) or equivalent if possible.

Thanks,
Scott
  Reply With Quote
Old 20th November 2008, 10:05 PM   #9
Mark Kravchenko
diyAudio Member
 
mwmkravchenko's Avatar
 
Join Date: Jan 2002
Location: Perth Canada
Default To reflect on a tube????

It is a tubular type.

I think you have a private e-mail awaiting!

Mark
__________________
Mark
www.kravchenko-audio.com
  Reply With Quote
Old 21st November 2008, 02:45 AM   #10
diyAudio Member
 
deepthrob's Avatar
 
Join Date: Jun 2008
Location: Taos, New Mexico
Quote:
Originally posted by cyclotronguy
[B]Panomaniac,

The one your uncle built from your description would be a published project from Popular Electronics in about 1966.
This one??:

http://www7.taosnet.com/f10/ShotGunMike.pdf

Frank /~ http://newmex.com/f10
@/
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
diy microphone pre-amp sadim1223 Parts 11 13th March 2009 05:30 PM
Some shotgun mic ideas wxn Parts 4 18th February 2006 03:40 PM
build my first full ranger,let's build another one:a small fullrange high end pc-spea then_dude Full Range 2 30th November 2005 08:54 AM
Do i need to build main supply (240v) filter?Or build power distribution? thomgun_lc Chip Amps 9 16th September 2005 10:52 AM
Need microphone amp borges Analogue Source 0 1st June 2005 11:52 AM


New To Site? Need Help?

All times are GMT. The time now is 10:22 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2