Today's Message Index:
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1. 05:49 AM - Re: Audio panel to camcorder mic input (Tim Shankland)
2. 05:55 AM - Re: Icom 210 wiring (Kevin Boddicker)
3. 07:20 AM - Re: Board Soldering: Overheating and Cleaning? (messydeer)
4. 09:38 AM - Re: Audio panel to camcorder mic input (Ron Quillin)
5. 01:55 PM - Re: Audio panel to camcorder mic input (Tim Olson)
Message 1
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Subject: | Re: Audio panel to camcorder mic input |
Here is the simple way I used when making video from my airplane. This
method is good for temporary connections. Just take an extra headset and
put a microphone in the earpieces, put them together and tape the whole
assembly together. No impedance problems to worry about.
Tim Shankland
Daniel Hooper wrote:
>
>My calculation is:
>
>To dissipate 45mW into 150 Ohms:
>http://www.wolframalpha.com/input/?i=45mW+%2F+sqrt%2845mW%2F150Ohms%29
>I get about 2.6V 'rms'.
>
>apply an approximate conversion factor to get rms into peak to peak:
>2.6V * (2/sqrt(2))
>http://www.wolframalpha.com/input/?i=45mW+%2F+sqrt%2845mW%2F150Ohms%29+*+%282%2Fsqrt2%29
>And I get 3.7V p-p
>
>To get that to 1v p-p, you need to divide it by four... or five to leave some
headroom.
>So, unless somebody calls me on an error, I say 10k in series, 3.3k to ground,
almost like your friend says.
>
>This would be going into the Line-in jack, and you'd need a separate divider for
left and right. Alternatively, you could just bring one channel off the intercom,
do the two resistors, and split the outputs to left and right.
>I'd say stay away from the mic jack if you can. It just adds problems.
>
>You'll probably still need to experiment with the volume knob on the intercom
to get what you're after.
>
>--Daniel
>
>
>On May 18, 2011, at 10:52 PM, DEAN PSIROPOULOS wrote:
>
>
>
>>
>>
>>Looking to connect a Sony camcorder to my PS engineering model 6000 audio
>>panel. An electrical engineering collegue suggested a simple resistor
>>network that consists of a 10kilohm in series with the signal line coming
>>out of the audio panel followed by a 200 ohm resistor connected across the
>>signal line to signal ground which is then connected to the microphone input
>>of the camcorder. I presented this to the support engineer at PS
>>engineering and he had no comment but instead suggested I talk to the folks
>>at edmo.com for a cable to make this connection. After talking to edmo
>>today and looking at their website it became apparent that they have no
>>commercially available interconnect that can perform this function.
>>
>>Edmo does have impedance matching cables to connect between civil aviation
>>audio panels and military headsets but I don't think these will work for my
>>application. Any EEs out there who work in analog audio? Any suggestions on
>>making something that keeps the audio panel outputs from saturating the mic
>>input? The camcorder input is stereo and so is the audio panel so hopefully
>>whatever design comes out of this exercise can be used in a stereo
>>application as well.
>>
>>
>>Specs on the camcorder mic input are as follows: Minijack, 0.388mV low
>>impedance with 2.5-3.0 volts DC, output impedance 6.8 kilohms, 3.5 mm stereo
>>type.
>>
>>Specs on camcorder also show an audio/video (?line?) input as follows: AV
>>Minijack, 1Vp-p, 75ohms, unbalanced 327mV, (at output impedance more than
>>47kilohms), output impedance with less than 2.2 kilohms/stereo minijack (3.5
>>mm), input impedance more than 47 kilohms.
>>
>>
>>Specs on the audio panel outputs are as follows: Headphone impedance- 150 to
>>1000ohms, Headphone output - 45 mW each headset no clipping. Audio
>>distortion less than 1% at 45 mW into 150 ohms, less than 10% THD at 70mW
>>into 150 ohms.
>>
>>Any suggestions? Anyone know of something I can purchase off-the-shelf that
>>will do this with no assembly required? Thanks.
>>
>>Dean Psiropoulos
>>RV-6A N197DM
>>Flying-3 years now!
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
Message 2
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Subject: | Re: Icom 210 wiring |
Chris,
Wire it per the diagram. The settings you want are in the software. You have to
set the levels you seek in the menu. Read the operating instructions. While not
extremely clear, it is in there.
Kevin Boddicker
TriQ 200 N7868B 203 hrs
Luana, IA.
On May 18, 2011, at 12:06 AM, chris Sinfield wrote:
>
> Hi
> Can someone who has gone before tell me how it works or doesn't work.
> I am wiring up the mikes and headsets for 2 people as per the I com sheet but
the headsets and Mic inputs are wired in parallel and so the individual functions
and levels of each mike and headset there fore cannot be controlled.
>
> Is this correct? or can you wire them up separately and have individual gain
and volume controls via the inbuilt PA. Page 20 of the manual does not really
go that deep into it..
>
> So how have others gone before when setting up a 2 seater system?
> Chris
> Zodiac XLB
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=340236#340236
>
>
>
>
>
>
>
>
>
>
>
Message 3
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Subject: | Re: Board Soldering: Overheating and Cleaning? |
> You got it backwards
Doh!
> There is an excellent guide to soldered electrical connections from
> NASA
Thanks! Here's a link I found:
http://www.hq.nasa.gov/office/codeq/doctree/NS87393.pdf
--------
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=340392#340392
Message 4
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Subject: | Re: Audio panel to camcorder mic input |
On 5/18/2011 20:52, DEAN PSIROPOULOS wrote:
> Looking to connect a Sony camcorder to my PS engineering model 6000 audio
> panel.
Is the camcorder going to be connected to ships power?
Consider seriously using a small transformer to match/couple between the
two devices.
Roll your own or perhaps something like this...
http://www.bhphotovideo.com/c/product/750963-REG/Sescom_LN2MIC_ZMH4_MON_3_5mm_Line_to_Mic.html
Ron Q.
Message 5
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Subject: | Re: Audio panel to camcorder mic input |
I had this problem recently when I tried to do the
same thing. I built the simple resistor network
with one on the signal and then the one to ground
and such, as was the common solution. I tested it
at home and while it did work, it induced noise
into the system with a portable intercom. Not sure
exactly why.
But, as a fluke, I tested just attenuating it with
a resistor only on the signal wires Left and Right.
I used a 1.5Meg and also tried 2Meg resistors, just
in series with the signal wires, nothing on the
ground. That actually worked out perfectly well.
It works pretty good with my PMA8000BT, which
I can't imagine would be different than the
PMA6000. So you may want to give that a try...if
that works well enough, you'd be done real quick.
Tim Olson - RV-10 N104CD
On 5/19/2011 11:33 AM, Ron Quillin wrote:
>
> On 5/18/2011 20:52, DEAN PSIROPOULOS wrote:
>> Looking to connect a Sony camcorder to my PS engineering model 6000 audio
>> panel.
> Is the camcorder going to be connected to ships power?
> Consider seriously using a small transformer to match/couple between the
> two devices.
>
> Roll your own or perhaps something like this...
>
> http://www.bhphotovideo.com/c/product/750963-REG/Sescom_LN2MIC_ZMH4_MON_3_5mm_Line_to_Mic.html
>
>
> Ron Q.
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