A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Owning
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

video-cam adaptor



 
 
Thread Tools Display Modes
  #1  
Old July 14th 03, 10:39 PM
Bonanza Man
external usenet poster
 
Posts: n/a
Default video-cam adaptor

is there an adaptor that'll take the head-set
audio-out of an airplane intercom into
a jack that can be put into a standard
microphone jack in a video-cam.



  #2  
Old July 15th 03, 02:21 PM
external usenet poster
 
Posts: n/a
Default

I don't know of an off-the-shelf adapter, but it needs to be an
impedance adapter. Headsets are typically 150-300 Ohm, with voltages
running upwards of 10V. Portable devices like cd players and other
line-in critters use a much lower voltage, and expect a lower source
impedance. If you truly want to go into the mic port, it'd have to accept
and modulate the bias voltage coming from the video-cam as well, I'd
expect.

If it were me, I'd build one... but need to do more research
first.

-Cory

Bonanza Man wrote:
: is there an adaptor that'll take the head-set
: audio-out of an airplane intercom into
: a jack that can be put into a standard
: microphone jack in a video-cam.




--
************************************************** ***********************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
************************************************** ***********************

  #3  
Old July 15th 03, 03:54 PM
Dylan Smith
external usenet poster
 
Posts: n/a
Default

On Mon, 14 Jul 2003 21:39:49 GMT, Bonanza Man wrote:
is there an adaptor that'll take the head-set
audio-out of an airplane intercom into
a jack that can be put into a standard
microphone jack in a video-cam.


I made one the quick and dirty way for my big trip.

All I did was stick a big resistor in-line with the audio (actually a
minature potentiometer, so I could fiddle with it). I initially underestimated
the resistance needed (I thought it might be on the order of 5k ohms,
I ended up using IIRC a 470K potentiometer maxed out). I just soldered
the pot to the pin for the intercom jack tip, then the wire to the other
end of the pot. The potentiometer fits inside the jack plug's cover,
and a bit of heat-shrink rubber makes sure the exposed contacts don't touch
the signal ground's pin. So you have


intercom jack

/-|============| 470K |---------------------left channel
/ |-----------------/\/\/\--|---------------------right channel stereo
\ | | jack
\_|============|------------ signal ground --------------------

It worked well. All the parts can be picked up at Radio Shack. I just
butchered a stereo jack extension cable for the camera side, and soldered
it into a nice screw-together large jack for the intercom. It is quick
and dirty; I think the proper method is to have some form of impedence
matching transformer, but I don't know whether such a beast exists that's
suitable for intercom - camera.

I also made a video camera stand which could be quickly attached to and
released. It was basically a shaped polystyrene block (shaped to the
curvature of the glareshield), which was velcroed to the panel. The camera
was in turn velcroed to the top of the polystyrene block. It stayed on
even during some of the severe turbulence I encountered crossing the Sierra
Nevadas (multiple negative-g bumps which made my charts almost hit the
roof) but was quick to pull off by hand. Make sure you don't site the camera
too close to the compass - I did some testing to see where I could place the
camera without causing the compass to move.

--
Dylan Smith, Castletown, Isle of Man
Flying: http://www.dylansmith.net
Frontier Elite Universe: http://www.alioth.net
"Maintain thine airspeed, lest the ground come up and smite thee"

  #4  
Old July 15th 03, 04:02 PM
Ron Natalie
external usenet poster
 
Posts: n/a
Default


"Dylan Smith" wrote in message ...
- I did some testing to see where I could place the
camera without causing the compass to move.

The testing is not sufficient. One of those places where the camera sits and keeps
the compass from moving might keep it from moving even when the plane turns.


  #5  
Old July 15th 03, 04:22 PM
Newps
external usenet poster
 
Posts: n/a
Default

I have a Sony Digital 8 camcorder. All you need is the attenuating
patch cord from Radio Shack. This plugs into the camcorder audio in.
On the other end you need an adaptor so it will plug into the intercom
audio out. Whole deal costs less than $10. Sounds great. Only down
side is there is now no engine noise on the tape. To secure the camera
I bought some elastic, comes in a long string. I tripled it up and
attached it to a couple of ring terminals that attach to two screws that
are part of an avionics access panel. The camera sits on top of a
sponge. The sponge lifts it up slightly for a better view out the
window, keeps the camera from moving and also totally eliminates
vibration. Just remember to set the camera to focus on a distant
object, not the nearest thing in front of it.

Bonanza Man wrote:
is there an adaptor that'll take the head-set
audio-out of an airplane intercom into
a jack that can be put into a standard
microphone jack in a video-cam.




  #6  
Old July 15th 03, 04:22 PM
external usenet poster
 
Posts: n/a
Default

Now that I got off on this tangent on intercom audio interfaces,
I'd suggest something like this for what you want (similar to previous
post):

Headset Plug Tip|----\/\/\/-----|====== Left/Right to cam
| 680 \
| / 82
| \
Headset Ground |---------------|------ GND of cam

That'll load it so it looks something like a real headset, but cut
the voltage down by a factor of 10 or so. If you don't want to load your
intercom, make it 6.8K and 820 Ohm. Adjust the 82 (or 820) size to
plus/minus a factor of 3 or so if you need to adjust the volume.

My guess it that'll do it.
-Cory

Dylan Smith wrote:
: On Mon, 14 Jul 2003 21:39:49 GMT, Bonanza Man wrote:
:is there an adaptor that'll take the head-set
:audio-out of an airplane intercom into
:a jack that can be put into a standard
:microphone jack in a video-cam.

: I made one the quick and dirty way for my big trip.

: All I did was stick a big resistor in-line with the audio (actually a
: minature potentiometer, so I could fiddle with it). I initially underestimated
: the resistance needed (I thought it might be on the order of 5k ohms,
: I ended up using IIRC a 470K potentiometer maxed out). I just soldered
: the pot to the pin for the intercom jack tip, then the wire to the other
: end of the pot. The potentiometer fits inside the jack plug's cover,
: and a bit of heat-shrink rubber makes sure the exposed contacts don't touch
: the signal ground's pin. So you have


: intercom jack

: /-|============| 470K |---------------------left channel
: / |-----------------/\/\/\--|---------------------right channel stereo
: \ | | jack
: \_|============|------------ signal ground --------------------

: It worked well. All the parts can be picked up at Radio Shack. I just
: butchered a stereo jack extension cable for the camera side, and soldered
: it into a nice screw-together large jack for the intercom. It is quick
: and dirty; I think the proper method is to have some form of impedence
: matching transformer, but I don't know whether such a beast exists that's
: suitable for intercom - camera.

: I also made a video camera stand which could be quickly attached to and
: released. It was basically a shaped polystyrene block (shaped to the
: curvature of the glareshield), which was velcroed to the panel. The camera
: was in turn velcroed to the top of the polystyrene block. It stayed on
: even during some of the severe turbulence I encountered crossing the Sierra
: Nevadas (multiple negative-g bumps which made my charts almost hit the
: roof) but was quick to pull off by hand. Make sure you don't site the camera
: too close to the compass - I did some testing to see where I could place the
: camera without causing the compass to move.

: --
: Dylan Smith, Castletown, Isle of Man
: Flying: http://www.dylansmith.net
: Frontier Elite Universe: http://www.alioth.net
: "Maintain thine airspeed, lest the ground come up and smite thee"


--
************************************************** ***********************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
************************************************** ***********************

  #8  
Old July 15th 03, 08:37 PM
Ross Oliver
external usenet poster
 
Posts: n/a
Default

Bonanza Man wrote:
is there an adaptor that'll take the head-set
audio-out of an airplane intercom into
a jack that can be put into a standard
microphone jack in a video-cam.



Aircraft Spruce P/N 13-01456,
Patch Cord Cockpit Voice Recorder
$24.95

See their catalog under "Headset Adapters and Extensions"

I have one, works great.


See also:

P/N 11-00694, CD Player Adapter
$29.30
Allows you to connect your CD player or other audio out
source to your headset, while remaining connected to the
aircraft radio.



Ross Oliver

  #9  
Old July 16th 03, 07:59 PM
Newps
external usenet poster
 
Posts: n/a
Default



Dylan Smith wrote:
On Tue, 15 Jul 2003 11:02:19 -0400, Ron Natalie wrote:

"Dylan Smith" wrote in message ...

- I did some testing to see where I could place the
camera without causing the compass to move.


The testing is not sufficient. One of those places where the camera sits
and keeps
the compass from moving might keep it from moving even when the plane turns.



The testing did involve a flight (I don't need much of an excuse to go flying,
and testing the camera stand etc. was ample excuse).


Who gives a rats ass if the compass is affected? We're talking VFR flight.

 




Thread Tools
Display Modes

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
turbo video Peter Holm Aerobatics 13 September 29th 04 11:31 PM
Aviation Video: Another F-16 bites the dust Iwan Bogels Instrument Flight Rules 0 September 21st 04 07:02 AM
In-Flight Video Ron Wanttaja Home Built 11 May 16th 04 06:11 AM
~ 5-MINUTE VIDEO OF BUSH THE MORNING OF 9/11 ~ B2431 Military Aviation 0 March 27th 04 05:46 AM
Why is Melissa Morrison the *STAR* of the video... X98 Military Aviation 1 March 20th 04 08:39 PM


All times are GMT +1. The time now is 05:45 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright Đ2004-2024 AviationBanter.
The comments are property of their posters.