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Posted by Rick Merrill on 08/28/07 20:33
Richard Crowley wrote:
> "Rick Merrill" wrote ...
>> If you Could put them in series (presently in parallel) then
>> the change would be 2x/(1/2).
>
> The formula for calculating series resistance is simply
> to add them together. Rseries = Ra + Rb
> For parallel it is: Rparallel = 1/(1/Ra + 1/Rb)
>
Hit enter too fast there?-)
in this case Ra = Rb.
So the ratio of series/parallel = 2Ra/(1/(1/Ra+1/Ra))
or 2Ra*(2/Ra)
or 4
Sorry, I don't have a URL for algebra :-)
> http://physics.bu.edu/py106/notes/Circuits.html
>
>>> Padding the mixer line-level output down to mic level
>>> should not be dependent on the input impedance of
>>> the camcorder. So impedance is a very minor factor
>>> in your situation as you have explained it here.
>>>
>>>> Would that be a step in the right direction?
>>> Padding the line level down to mic level would be the
>>> right direction. Using shielded cable would definitely
>>> be the right direction.
>>>
>>> You could even consider recording the audio on some
>>> other machine (that doesn't have AGC), but we don't
>>> know what your production flow is and whether you
>>> could accommodate separate sound recording? And
>>> we don't even know what you are producing and how
>>> much of a problem the "pumping" is?
>> it's not much of a problem - just an annoyance to those
>> of us who hear it / watch it.
>>
>> The dual input idea is a great one - and easy to mix in post, if I
>> remember!
>>
>> Where can I get a nice, flexible shielded cable? Anybody got 25' to spare?
>
> Any old shielded cable would work. Many of us have such stuff in
> our junk-boxes. If you are in the PDX area I'll make you a cable.
> Else you can almost certainly acquire the necessary cable and
> adapters, etc. at a consumer electronics/stereo shop (Radio
> Shack, et.al.)
>
>
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