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Re: plug-in power mic

Subject: Re: plug-in power mic
From: "Curt Olson" flipov411
Date: Tue Jul 6, 2010 7:40 am ((PDT))
Thank you, Klas. And thanks also to Mike Rooke and Eric Benjamin for
their private off-list replies.

Curt Olson

Klas wrote:

> 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
> 9v. 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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