Meaning of this Microphone spec...

[amdx]

Looking at a electret condensor mic, it has a spec, \"Decreasing Voltage
   (3VS to 2VS ) -3dB\"

What does that mean?

> https://www.mouser.com/datasheet/2/334/AOM-5024L-HD-R-1219369.pdf

Also, the frequency response graph is labeled (db/1V) and shows it down
37 at 18kHz, that can\'t be down 37db at 18Khz.

What does that mean?

Mikek


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

 

[Phil Allison]

George Herold wrote:
-----------------------------

Grin, OK. I know SFA about mics...I\'m easily confused.

** You said it.....

I liked the part about the mic having two ports.
One only weakly linked to the air. It does the ~ DC.

** Yep - pressure relief for altitude changes & to make a mic cardioid.

> Splitting the frequency response into two parts is a good trick.

** There are dual capsule cardioid mics with x-overs and simpler ones using resonant chambers in the handle and on top of the diaphragm to extend response range.

Then there are condenser mics that do it all differently as the diaphragm\'s output signal is amplitude sensitive rather than velocity.


....... Phil

 

[bitrex]

On 11/30/2020 5:08 PM, Phil Allison wrote:

George Herold wrote:
==================

Only of tangential interest, but there is a nice series of microphone videos
on the EEVblog.

** Tangential for sure - cos it tells you SFA about microphones

The \"expert\" at the white board is Doug Ford, a former mate of mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

Doug relied on me for a lot of advice, pointing him away from dead ends and into usable directions.

Interesting stuff.

** Not really.

...... Phil

 

[Phil Allison]

bitrex the bit brain wrote:
--------------------------------------

The \"expert\" at the white board is Doug Ford, a former mate of mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

** Not so much when you know the whole story.

\"Rode\" is a name invented here to make cheap Chinese SPL meters seem European and better sellers.
Involved a simple screen printing job plus translating the operator\'s manual. The Chinese meter used a
copied European condenser capsule ( CSM-25) and was a clone of a 1960s B&K model.
All Chinese made parts inside, Si & Ge BJTs, JFETs, op-amps the lot.

I still have a couple of them myself.

They same maker produced a large diaphragm mic that was styled like something out of the 1950s. So the
Rode people ( Freedman Electronics in Sydney) bought capsules, loaded PCBs and transformers from the
Chinese and built the bits into a modem looking case made here. That became the Rode NT-1 (aka the Rodent) .

This pile of bits sold like hot cakes round the world, so a new company was formed ( Rode Microphones ) and
with new premises began large scale production. As new capsule designs became available from China, new
model mics appeared labelled \" Rode\". Including hand held models, a tube model etc , which Mr Ford had a
large hand in. Hand stuffed PCBs were replaced with professional SMD versions and nice metal work for them
was sourced. The output tranny disappeared and was replaced by one of Doug\'s active balanced designs.

A great deal was also \"discovered\" by studying the schematics for every famous European mic Rode could get
their fingers on.

Just when this was all going nicely, a falling out with management saw Doug Ford leave for greener pastures.

There is only so much a \" Koala can Bear. \"


...... Phil

 

[server]

On Mon, 30 Nov 2020 23:39:05 -0800 (PST), Phil Allison
<pallison49@gmail.com> wrote:

bitrex the bit brain wrote:
--------------------------------------


The \"expert\" at the white board is Doug Ford, a former mate of mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

** Not so much when you know the whole story.

\"Rode\" is a name invented here to make cheap Chinese SPL meters seem European and better sellers.
Involved a simple screen printing job plus translating the operator\'s manual. The Chinese meter used a
copied European condenser capsule ( CSM-25) and was a clone of a 1960s B&K model.
All Chinese made parts inside, Si & Ge BJTs, JFETs, op-amps the lot.

I still have a couple of them myself.

They same maker produced a large diaphragm mic that was styled like something out of the 1950s. So the
Rode people ( Freedman Electronics in Sydney) bought capsules, loaded PCBs and transformers from the
Chinese and built the bits into a modem looking case made here. That became the Rode NT-1 (aka the Rodent) .

This pile of bits sold like hot cakes round the world, so a new company was formed ( Rode Microphones ) and
with new premises began large scale production. As new capsule designs became available from China, new
model mics appeared labelled \" Rode\". Including hand held models, a tube model etc , which Mr Ford had a
large hand in. Hand stuffed PCBs were replaced with professional SMD versions and nice metal work for them
was sourced. The output tranny disappeared and was replaced by one of Doug\'s active balanced designs.

A great deal was also \"discovered\" by studying the schematics for every famous European mic Rode could get
their fingers on.

Just when this was all going nicely, a falling out with management saw Doug Ford leave for greener pastures.

There is only so much a \" Koala can Bear. \"


..... Phil

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?







--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

 

[bitrex]

On 12/1/2020 2:39 AM, Phil Allison wrote:

bitrex the bit brain wrote:
--------------------------------------


The \"expert\" at the white board is Doug Ford, a former mate of mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

** Not so much when you know the whole story.

\"Rode\" is a name invented here to make cheap Chinese SPL meters seem European and better sellers.
Involved a simple screen printing job plus translating the operator\'s manual. The Chinese meter used a
copied European condenser capsule ( CSM-25) and was a clone of a 1960s B&K model.
All Chinese made parts inside, Si & Ge BJTs, JFETs, op-amps the lot.

I still have a couple of them myself.

They same maker produced a large diaphragm mic that was styled like something out of the 1950s. So the
Rode people ( Freedman Electronics in Sydney) bought capsules, loaded PCBs and transformers from the
Chinese and built the bits into a modem looking case made here. That became the Rode NT-1 (aka the Rodent) .

This pile of bits sold like hot cakes round the world, so a new company was formed ( Rode Microphones ) and
with new premises began large scale production. As new capsule designs became available from China, new
model mics appeared labelled \" Rode\". Including hand held models, a tube model etc , which Mr Ford had a
large hand in. Hand stuffed PCBs were replaced with professional SMD versions and nice metal work for them
was sourced. The output tranny disappeared and was replaced by one of Doug\'s active balanced designs.

A great deal was also \"discovered\" by studying the schematics for every famous European mic Rode could get
their fingers on.

Just when this was all going nicely, a falling out with management saw Doug Ford leave for greener pastures.

There is only so much a \" Koala can Bear. \"


..... Phil

<https://youtu.be/RrhHQfGkTYw?t=799>

Couldn\'t they have like, designed the capsule isolation mount itself in
such a way so the combination of capsule and isolator was critically
damped for impulses below a threshold, when it was suspended?

 

[bitrex]

On 12/1/2020 11:10 AM, jlarkin@highlandsniptechnology.com wrote:

On Mon, 30 Nov 2020 23:39:05 -0800 (PST), Phil Allison
pallison49@gmail.com> wrote:

bitrex the bit brain wrote:
--------------------------------------


The \"expert\" at the white board is Doug Ford, a former mate of mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

** Not so much when you know the whole story.

\"Rode\" is a name invented here to make cheap Chinese SPL meters seem European and better sellers.
Involved a simple screen printing job plus translating the operator\'s manual. The Chinese meter used a
copied European condenser capsule ( CSM-25) and was a clone of a 1960s B&K model.
All Chinese made parts inside, Si & Ge BJTs, JFETs, op-amps the lot.

I still have a couple of them myself.

They same maker produced a large diaphragm mic that was styled like something out of the 1950s. So the
Rode people ( Freedman Electronics in Sydney) bought capsules, loaded PCBs and transformers from the
Chinese and built the bits into a modem looking case made here. That became the Rode NT-1 (aka the Rodent) .

This pile of bits sold like hot cakes round the world, so a new company was formed ( Rode Microphones ) and
with new premises began large scale production. As new capsule designs became available from China, new
model mics appeared labelled \" Rode\". Including hand held models, a tube model etc , which Mr Ford had a
large hand in. Hand stuffed PCBs were replaced with professional SMD versions and nice metal work for them
was sourced. The output tranny disappeared and was replaced by one of Doug\'s active balanced designs.

A great deal was also \"discovered\" by studying the schematics for every famous European mic Rode could get
their fingers on.

Just when this was all going nicely, a falling out with management saw Doug Ford leave for greener pastures.

There is only so much a \" Koala can Bear. \"


..... Phil

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?

They use them for noise-profiling aerodynamic structures in wind-tunnel
testing.

Gunshot localization, perhaps

 

[bitrex]

On 12/1/2020 11:10 AM, jlarkin@highlandsniptechnology.com wrote:

On Mon, 30 Nov 2020 23:39:05 -0800 (PST), Phil Allison
pallison49@gmail.com> wrote:

bitrex the bit brain wrote:
--------------------------------------


The \"expert\" at the white board is Doug Ford, a former mate of mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

** Not so much when you know the whole story.

\"Rode\" is a name invented here to make cheap Chinese SPL meters seem European and better sellers.
Involved a simple screen printing job plus translating the operator\'s manual. The Chinese meter used a
copied European condenser capsule ( CSM-25) and was a clone of a 1960s B&K model.
All Chinese made parts inside, Si & Ge BJTs, JFETs, op-amps the lot.

I still have a couple of them myself.

They same maker produced a large diaphragm mic that was styled like something out of the 1950s. So the
Rode people ( Freedman Electronics in Sydney) bought capsules, loaded PCBs and transformers from the
Chinese and built the bits into a modem looking case made here. That became the Rode NT-1 (aka the Rodent) .

This pile of bits sold like hot cakes round the world, so a new company was formed ( Rode Microphones ) and
with new premises began large scale production. As new capsule designs became available from China, new
model mics appeared labelled \" Rode\". Including hand held models, a tube model etc , which Mr Ford had a
large hand in. Hand stuffed PCBs were replaced with professional SMD versions and nice metal work for them
was sourced. The output tranny disappeared and was replaced by one of Doug\'s active balanced designs.

A great deal was also \"discovered\" by studying the schematics for every famous European mic Rode could get
their fingers on.

Just when this was all going nicely, a falling out with management saw Doug Ford leave for greener pastures.

There is only so much a \" Koala can Bear. \"


..... Phil

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?

Hearing aids, maybe. A microphone array that can localize where the
people who are speaking in a room are, are and boost the gain
dynamically as appropriate for the range and bearing of each speaker.

 

[Phil Allison]

Some Jerk-Off called Larkin puked:

===============================

(snip entire context)

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?

** Could a more irrelevant or meaningless reply be imagined?


..... Phil

 

[Phil Hobbs]

On 12/1/20 11:28 AM, bitrex wrote:

On 12/1/2020 11:10 AM, jlarkin@highlandsniptechnology.com wrote:
On Mon, 30 Nov 2020 23:39:05 -0800 (PST), Phil Allison
pallison49@gmail.com> wrote:

bitrex the bit brain wrote:
--------------------------------------


The \"expert\" at the white board is Doug Ford, a former mate of
mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a
single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

** Not so much when you know the whole story.

\"Rode\"  is a name invented here to make cheap Chinese SPL meters seem
European and better sellers.
Involved a simple screen printing job plus translating the operator\'s
manual. The Chinese meter used a
copied European condenser capsule ( CSM-25) and was a clone of a
1960s B&K model.
All Chinese made parts inside, Si & Ge BJTs, JFETs, op-amps the lot.

I still have a couple of them myself.

They same maker produced a large diaphragm mic that was styled like
something out of the 1950s. So the
Rode people ( Freedman Electronics in Sydney) bought capsules, loaded
PCBs and transformers from the
Chinese and built the bits into a modem looking case made here. That
became the Rode NT-1 (aka the Rodent) .

This pile of bits sold like hot cakes round the world, so a new
company was formed ( Rode Microphones ) and
with new premises began large scale production.  As new capsule
designs became available from China, new
model mics appeared labelled \" Rode\".  Including hand held models, a
tube model etc , which Mr Ford had a
large hand in.  Hand stuffed PCBs were replaced with professional SMD
versions and nice metal work for them
was sourced.  The output tranny disappeared and was replaced by one
of Doug\'s active balanced designs.

A great deal was also \"discovered\" by studying the schematics for
every famous European mic Rode could get
their fingers on.

Just when this was all going nicely, a falling out with management
saw Doug Ford leave for greener pastures.

There is only so much a \" Koala can Bear. \"


.....   Phil

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?


They use them for noise-profiling aerodynamic structures in wind-tunnel
testing.

Gunshot localization, perhaps

BAE makes a system like that.

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[bitrex]

On 12/1/2020 3:15 PM, Phil Hobbs wrote:

On 12/1/20 11:28 AM, bitrex wrote:
On 12/1/2020 11:10 AM, jlarkin@highlandsniptechnology.com wrote:
On Mon, 30 Nov 2020 23:39:05 -0800 (PST), Phil Allison
pallison49@gmail.com> wrote:

bitrex the bit brain wrote:
--------------------------------------


The \"expert\" at the white board is Doug Ford, a former mate of
mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a
single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

** Not so much when you know the whole story.

\"Rode\"  is a name invented here to make cheap Chinese SPL meters
seem European and better sellers.
Involved a simple screen printing job plus translating the
operator\'s manual. The Chinese meter used a
copied European condenser capsule ( CSM-25) and was a clone of a
1960s B&K model.
All Chinese made parts inside, Si & Ge BJTs, JFETs, op-amps the lot.

I still have a couple of them myself.

They same maker produced a large diaphragm mic that was styled like
something out of the 1950s. So the
Rode people ( Freedman Electronics in Sydney) bought capsules,
loaded PCBs and transformers from the
Chinese and built the bits into a modem looking case made here. That
became the Rode NT-1 (aka the Rodent) .

This pile of bits sold like hot cakes round the world, so a new
company was formed ( Rode Microphones ) and
with new premises began large scale production.  As new capsule
designs became available from China, new
model mics appeared labelled \" Rode\".  Including hand held models, a
tube model etc , which Mr Ford had a
large hand in.  Hand stuffed PCBs were replaced with professional
SMD versions and nice metal work for them
was sourced.  The output tranny disappeared and was replaced by one
of Doug\'s active balanced designs.

A great deal was also \"discovered\" by studying the schematics for
every famous European mic Rode could get
their fingers on.

Just when this was all going nicely, a falling out with management
saw Doug Ford leave for greener pastures.

There is only so much a \" Koala can Bear. \"


.....   Phil

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?


They use them for noise-profiling aerodynamic structures in
wind-tunnel testing.

Gunshot localization, perhaps

BAE makes a system like that.

Cheers

Phil Hobbs

I\'m guessing it\'s more like for a battlefield scenario? where having
multiple receivers some distance from each other for triangulation often
isn\'t practicable as opposed to say fixed installments in urban areas

 

[Phil Hobbs]

On 12/1/20 10:14 PM, bitrex wrote:

On 12/1/2020 3:15 PM, Phil Hobbs wrote:
On 12/1/20 11:28 AM, bitrex wrote:
On 12/1/2020 11:10 AM, jlarkin@highlandsniptechnology.com wrote:
On Mon, 30 Nov 2020 23:39:05 -0800 (PST), Phil Allison
pallison49@gmail.com> wrote:

bitrex the bit brain wrote:
--------------------------------------


The \"expert\" at the white board is Doug Ford, a former mate of
mine. He began working for
Australia\'s leading microphone maker ( Rode) without having a
single clue..
They did not have a clue either - just copied things made in China.

Well that\'s different...

** Not so much when you know the whole story.

\"Rode\"  is a name invented here to make cheap Chinese SPL meters
seem European and better sellers.
Involved a simple screen printing job plus translating the
operator\'s manual. The Chinese meter used a
copied European condenser capsule ( CSM-25) and was a clone of a
1960s B&K model.
All Chinese made parts inside, Si & Ge BJTs, JFETs, op-amps the lot.

I still have a couple of them myself.

They same maker produced a large diaphragm mic that was styled like
something out of the 1950s. So the
Rode people ( Freedman Electronics in Sydney) bought capsules,
loaded PCBs and transformers from the
Chinese and built the bits into a modem looking case made here.
That became the Rode NT-1 (aka the Rodent) .

This pile of bits sold like hot cakes round the world, so a new
company was formed ( Rode Microphones ) and
with new premises began large scale production.  As new capsule
designs became available from China, new
model mics appeared labelled \" Rode\".  Including hand held models,
a tube model etc , which Mr Ford had a
large hand in.  Hand stuffed PCBs were replaced with professional
SMD versions and nice metal work for them
was sourced.  The output tranny disappeared and was replaced by one
of Doug\'s active balanced designs.

A great deal was also \"discovered\" by studying the schematics for
every famous European mic Rode could get
their fingers on.

Just when this was all going nicely, a falling out with management
saw Doug Ford leave for greener pastures.

There is only so much a \" Koala can Bear. \"


.....   Phil

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?


They use them for noise-profiling aerodynamic structures in
wind-tunnel testing.

Gunshot localization, perhaps

BAE makes a system like that.

Cheers

Phil Hobbs



I\'m guessing it\'s more like for a battlefield scenario? where having
multiple receivers some distance from each other for triangulation often
isn\'t practicable as opposed to say fixed installments in urban areas

It\'s basically for finding snipers IIRC.

The wind tunnel thing is pretty well doomed because sound gets dragged
along by the air and scrambled by turbulence, unlike EM radiation.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Terrance Lackie]

On Tuesday, December 1, 2020 at 9:11:50 AM UTC-7, jla...@highlandsniptechnology.com wrote:

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?
--

John Larkin Highland Technology, Inc
The best designs are necessarily accidental.

I think the Amazon Alexa makes use of this.

 

[amdx]

On 11/29/2020 6:54 PM, Lasse Langwadt Christensen wrote:

mandag den 30. november 2020 kl. 01.32.09 UTC+1 skrev Cursitor Doom:
On Sun, 29 Nov 2020 11:35:51 -0600, amdx <am...@knology.net> wrote:
On 11/29/2020 11:22 AM, John Larkin wrote:
On Sun, 29 Nov 2020 10:46:53 -0600, amdx <am...@knology.net> wrote:

Looking at a electret condensor mic, it has a spec, \"Decreasing Voltage
(3VS to 2VS ) -3dB\"

What does that mean?
Gain drops as supply voltage drops. It would be even worse at 1 volt.

https://www.mouser.com/datasheet/2/334/AOM-5024L-HD-R-1219369.pdf
Also, the frequency response graph is labeled (db/1V) and shows it down
37 at 18kHz, that can\'t be down 37db at 18Khz.

What does that mean?
It\'s \"down\" about 12 dB at that notch, -25 to -37 dBv. Probably some
resonance.

Thanks all, doesn\'t seem like a great mic.
Depends what you want to use it for! Not much use for high quality
music recording at any rate.
look up the frequency response of an SM57 and SM58
a helluva lot of music has been recorded and performed with those two

 I have a couple of the Electret Condensor mics working. I found my
computer mic jack _IS_ stereo, And, the jack also supplies 3 Volts to drive

the FET in the mic. I got two sections of a small coax connected to the
3.5mm stereo plug and put the mics on the other end.

After I connected it to my computer, I only had one channel working. I
decided to do a resistance check and found a short.

Thinking I had got the braid to hot and it shorted to the center
conductor, I cut off the 3.5mm plug. Hmm, still shorted.

 Ok a bad mic, remove a wire from the mic,  nope, the mics not shorted.
OK, the coax is shorted, both ends are treated so I know they are not
the cause of the short.

I examine the coax for a bad spot, no cuts or crushes, but I do find
just a tiny bump, I cut it off just past the bump and strip the wire. It
looks like the center conductor

had got kinked before the insulation was added, just a tiny bit was
outside the insulation and that shorted to the shield.

  Now I have it all reassembled and it works, now to learn the ins and
outs of Audacity.



--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

 

[Rick C]

On Tuesday, December 1, 2020 at 9:07:48 PM UTC-5, amdx wrote:

had got kinked before the insulation was added, just a tiny bit was
outside the insulation and that shorted to the shield.

Now I have it all reassembled and it works, now to learn the ins and
outs of Audacity.

I\'ve used Audacity and Sonic Visualizer a bit. They both have their quirks and nice features. You might try out Sonic Visualizer to see if it might be more useful to you.


--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

 

[amdx]

On 12/1/2020 8:15 PM, Rick C wrote:

On Tuesday, December 1, 2020 at 9:07:48 PM UTC-5, amdx wrote:
had got kinked before the insulation was added, just a tiny bit was
outside the insulation and that shorted to the shield.

Now I have it all reassembled and it works, now to learn the ins and
outs of Audacity.
I\'ve used Audacity and Sonic Visualizer a bit. They both have their quirks and nice features. You might try out Sonic Visualizer to see if it might be more useful to you.


I don\'t even know what I want to do with it yet, other than record audio.

My son borrowed a ukulele and started playing it, then he bought his own.

He picked it up quick as he already played guitar.

Anyway, I thought I would see if we could spend a little time learning
about recording.

                                     Mikek


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

 

[server]

On Tue, 01 Dec 2020 08:10:46 -0800, jlarkin@highlandsniptechnology.com
wrote:

One could put a lot of tiny MEMS or electret mikes on one PC board. I
wonder what could be done with that. And maybe a bit of DSP? A
phased-array microphone?

Thanks to the small dimensions of these microphone capsules. all four
microphones in Ambisonic https://en.wikipedia.org/wiki/Ambisonics
tetrahedron can be put into a single point even at 20 kHz (wavelength
16 mm).

The signals can be used to produce the B-format (W, x, y, z) channels,
which can then be used to produce different radiation patterns, such
as cardioid and aim it into different directions, either in real time
or in post processing.

 

[piglet]

On 29/11/2020 4:46 pm, amdx wrote:

Looking at a electret condensor mic, it has a spec, \"Decreasing Voltage
   (3VS to 2VS ) -3dB\"

What does that mean?

https://www.mouser.com/datasheet/2/334/AOM-5024L-HD-R-1219369.pdf

Also, the frequency response graph is labeled (db/1V) and shows it down
37 at 18kHz, that can\'t be down 37db at 18Khz.

What does that mean?

Mikek

According to schematic given Vs is the supply voltage so dropping from 3
volts to 2 volts drops outputs 3dB.

Freq response graph shows -37dB at 18kHz but -25dB at 1kHz so dropoff at
18kHz vs 1kHz is only 12dB.

piglet

 

[John Larkin]

On Sun, 29 Nov 2020 10:46:53 -0600, amdx <amdx@knology.net> wrote:

Looking at a electret condensor mic, it has a spec, \"Decreasing Voltage
   (3VS to 2VS ) -3dB\"

What does that mean?

Gain drops as supply voltage drops. It would be even worse at 1 volt.

https://www.mouser.com/datasheet/2/334/AOM-5024L-HD-R-1219369.pdf

Also, the frequency response graph is labeled (db/1V) and shows it down
37 at 18kHz, that can\'t be down 37db at 18Khz.

What does that mean?

It\'s \"down\" about 12 dB at that notch, -25 to -37 dBv. Probably some
resonance.

--

John Larkin Highland Technology, Inc trk

The cork popped merrily, and Lord Peter rose to his feet.
\"Bunter\", he said, \"I give you a toast. The triumph of Instinct over Reason\"

 

[amdx]

On 11/29/2020 11:22 AM, John Larkin wrote:

On Sun, 29 Nov 2020 10:46:53 -0600, amdx <amdx@knology.net> wrote:

Looking at a electret condensor mic, it has a spec, \"Decreasing Voltage
   (3VS to 2VS ) -3dB\"

What does that mean?
Gain drops as supply voltage drops. It would be even worse at 1 volt.

https://www.mouser.com/datasheet/2/334/AOM-5024L-HD-R-1219369.pdf
Also, the frequency response graph is labeled (db/1V) and shows it down
37 at 18kHz, that can\'t be down 37db at 18Khz.

What does that mean?
It\'s \"down\" about 12 dB at that notch, -25 to -37 dBv. Probably some
resonance.

Thanks all, doesn\'t seem like a great mic.

                   Mikek


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