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Re: plug-in power mic

Subject: Re: plug-in power mic
From: "Klas Strandberg" klasstrandberg
Date: Mon Jul 5, 2010 10:43 am ((PDT))
Hi guys.

First - I have only looked at the pcb of the internal D10 mic's,
which is the same PCB as em172, just another color.
I cannot confirm that it is the same IC inside. If another IC, it is
totally another mic.

The Telinga Clip-On's were made for Olympus LS-xx and Zoom H4n.
If you want to run them with another recorder, you need an external battery=
.

Two capsules in parallel make less self-noise than one capsule.

One cannot compare different pip-mic's. The WL-183 might have totally
different behavior vs voltage than a Primo capsule, or a Panasonic
capsule, of a certain type.
A big difference is if a PIP mic has a fet-transistor or a IC,
looking like a fet-transistor, for example.
In my opinion, the 183 has the best sound quality of all similar
mic's, but not the lowest self noise.

A EM-100 capsule behaves the same at all voltages between 0,7v and
Message: 9v. 
Subject: At 0,65 it still works fine, but you can observe that the IC is
getting into trouble by squeezing the capsule. That will create a
very strong infrasound into the IC which it cannot handle. Then it
gets unstable and tries to find a better working point and you can
hear how the output is varying. At 0,6v the self noise gets poor.

Sony doesn't use a resistor to feed the mic, but a current generator.
The intention is probably to keep the input impedance high.

All Telinga Clip-On=B4s now come with a nylon reinforced Mogami cable.

Klas


At 16:34 2010-07-04, you wrote:
>raimund wrote:
>
> > Mike Rooke wrote:
> >
> >> Ive used three <part number that shall not be named by me in order
> >> to respect Telinga's wish many moons ago that we don't discuss part
> >> numbers> dangling off the PIP supply from a Sony D50, by "reliable"
> >> do you mean giving the same sensitivity as a single capsule or
> >> something else?
> >
> >
> > Hi Mike,
> >
> > By reliable I mean the PIP voltage level under load conditions. In
> > my tests with the M10, the voltage heavily floated around below 1 V
> > (if I remember correctly). The D50 provided much better results in
> > that regard.
> >
> > Unfortunately, I did not measured the resulting sensitivity.
> >
> > Regards,
> > raimund
>
>So guys, you're saying that mic sensitivity will vary with PIP
>voltage? Is this limited to the unnamed capsules Mike has tested, or
>is this a general rule of thumb that will apply to other PIP mics
>also, like WL-183s?
>
>Curt Olson
>
>
>------------------------------------
>
>"While a picture is worth a thousand words, a
>sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause
>Yahoo! Groups Links
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email: 
website: www.telinga.com









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