Re: Linkwitz to ground/source/drain
Exactly what I was looking for, thank you!
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Re: Linkwitz to ground/source/drain
More info. than I can handle ;>) - very helpful, thank you.
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Re: Linkwitz to ground/source/drain
Although it's generally the contrary that is asked (modding a
2-wre into a 3-wire), it is quite easy to do.
Just connect the source to ground.
Another possibility is to connect a resistor between source and
ground.
That decreases sensitivity, but it also increases max SPL
capability and decreases distortion.
A typical value is 2.2kohm but actually the value depends very
much on the FET and the desired change.
Le 18/09/2024 ¨¤ 12:02, A Van Der
Reijden via groups.io a ¨¦crit?:
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Is there a way to connect a 3 pad electret
(ground/source/drain) to the Linkwitz 2 wire solution? Thank
you!
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Re: Linkwitz to ground/source/drain
Does this give you the information you need?
And?
? around half way down
Craig
------ Original Message ------
Date 18/09/2024 11:02:24
Subject [MicBuilders] Linkwitz to ground/source/drain
Is there a way to connect a 3 pad electret (ground/source/drain) to the Linkwitz 2 wire solution? Thank you!
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Linkwitz to ground/source/drain
Is there a way to connect a 3 pad electret (ground/source/drain) to the Linkwitz 2 wire solution? Thank you!
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Re: Learning about amplifiers
I've done a lot of the stuff I shouldn't be able to. I built a high altitude balloon tracker and managed to write the code to .make it parse gps strings and transmit them using RTTY. I designed the PCB for that and got it all working. Ive done PCBs from schematics and got them made and they all work. One of which was the high Z amp that jules did for the hydrophones (it was far cheaper than just the shipping from JLI to the UK for 50 boards). Maybe I should take a step back and just do things on a breadboard so I can tweak and play with things. I bought 5 of those caps I posted about the other day for about 60p each. So I have a source of things I'm not scared to fry. The art of electronics does look good, I think I need to employ the mountaineers trick of breaking the book (mountain) down into smaller parts, rather than looking at the sheer enormity of it and running away as ever. The opamp pdf also looks like a good course in itself that goes from the very basics. Maybe those two are all I really need.?
On Tue, 17 Sept 2024, 21:13 kennjava, < ken@...> wrote: "The Art of Electronics" is absolutely worth having. True story : while I was struggling in Electrical Engineering (its almost all calculus, and i suck at calculus),? my friend in Physics took a one term electronics course that went straight to all the practical every-day transistor design stuff that I was dying to learn, and "The Art of Electronics" was their text. Op-amps are vital audio building blocks, so be sure to spend time with those.
?
Rod Elliot's circuits are also very useful, as well as Paul's advice here. And I believe there are some decent free electronics courses online. So it is possible to learn from basic principles and go up.
?
It's also possible to go in the other direction: find a project you like, build it, and then spend some time learning about how that circuit actually works (and how you could tweak it). A lot of useful hacking is done these days just by using an IC or module as a black box.
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Re: Learning about amplifiers
"The Art of Electronics" is absolutely worth having. True story : while I was struggling in Electrical Engineering (its almost all calculus, and i suck at calculus),? my friend in Physics took a one term electronics course that went straight to all the practical every-day transistor design stuff that I was dying to learn, and "The Art of Electronics" was their text. Op-amps are vital audio building blocks, so be sure to spend time with those.
?
Rod Elliot's circuits are also very useful, as well as Paul's advice here. And I believe there are some decent free electronics courses online. So it is possible to learn from basic principles and go up.
?
It's also possible to go in the other direction: find a project you like, build it, and then spend some time learning about how that circuit actually works (and how you could tweak it). A lot of useful hacking is done these days just by using an IC or module as a black box.
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Re: Learning about amplifiers
I do not have a book or website to recommend except perhaps Rod Elliot¡¯s, but what you seem to want is an understanding of the various basic single-stage amplifier types, such as common emitter, common base, common collector, and then the fundamentals of different devices such as BJTs, JFETs (depletion mode and enhancement mode), MOSFETs, and so on.?
Then you want to be able to look at a complex schematic and break it down into functional blocks. To keep this on track a typical mic amplifier has an impedance converter to go from the extremely high impedance of the capsule to a low impedance that is capable of driving more circuitry without attracting EM interference, and then a low impedance drive stage to drive a cable of several metres and the input impedance of a preamp. You might also have a circuit to provide a 50V-200V polarisation voltage for the capsule if it is not an electret.
There have been various historical technologies used which still today influence the choices made, such as transformers in microphone preamps (which allowed ¡°phantom¡± power to be used for microphones, so some of the modern circuits seek to provide optimum performance in a real world where some parts of the signal chain may not be optimised for current technology.
I hope this helps!
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On 17 Sep 2024, at 20:11, Adrian Hicks via groups.io <mail@...> wrote:
Of course, I was more looking for recommendations on the best materials.? I had considered an online course, but not wanting to become an electronics engineer I didn't really know what would be the best option. Hill and Horowitz seems to be a Bachelors degree in a book, but it's just the size of it that makes it seem insurmountable. I suppose I just need to break down into the actual elements I really need to learn.? I.e ohms and Kirchoff's laws and then move on from there. I think being a mechanical engineer is a curse, because anything you don't understand means that you now 'need' to understand it. lol that is more than an email ?.? Let me see what references I can find.? Best Regards,
Jules Ryckebusch? ? The basics of how they work. I've looked at your designs and from other conversations on here seen other schematics. I'd like to be able to read a schematic. Currently I can only work out the most basic elements such as filtering caps and voltage dividers but not the whole schematic.? It's analogous to being given a map but not having the ability to read it but being able to see the destination on it.
What are you wanting to learn in reference to them? I have built a few and just finished a 12 channel build.? I lot has shifted in the past 20 years specifically the use of Class D. My build used LM3886 chips? Best Regards,
Jules Ryckebusch? ? I¡¯ve been looking around to try to find some sources of material to enable me to learn about how amplifiers work.? I¡¯ve only got the most rudimentary electronics knowledge so end up floundering very quickly.? I bought The Art of Electronics a while ago and have had a cursory browse through it.
I was also recommended this paper by an old work colleague.
"Audio power amplifier design" has also been recommended to me.
What do you guys think / recommend to enable learning about these things? It seems that a lot of you are well versed in the ways of coercing electrons
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Re: Learning about amplifiers
Of course, I was more looking for recommendations on the best materials.? I had considered an online course, but not wanting to become an electronics engineer I didn't really know what would be the best option. Hill and Horowitz seems to be a Bachelors degree in a book, but it's just the size of it that makes it seem insurmountable. I suppose I just need to break down into the actual elements I really need to learn.? I.e ohms and Kirchoff's laws and then move on from there. I think being a mechanical engineer is a curse, because anything you don't understand means that you now 'need' to understand it.
lol that is more than an email ?.? Let me see what references I can find.? Best Regards,
Jules Ryckebusch? ? The basics of how they work. I've looked at your designs and from other conversations on here seen other schematics. I'd like to be able to read a schematic. Currently I can only work out the most basic elements such as filtering caps and voltage dividers but not the whole schematic.? It's analogous to being given a map but not having the ability to read it but being able to see the destination on it.
What are you wanting to learn in reference to them? I have built a few and just finished a 12 channel build.? I lot has shifted in the past 20 years specifically the use of Class D. My build used LM3886 chips? Best Regards,
Jules Ryckebusch? ? I¡¯ve been looking around to try to find some sources of material to enable me to learn about how amplifiers work.? I¡¯ve only got the most rudimentary electronics knowledge so end up floundering very quickly.? I bought The Art of Electronics a while ago and have had a cursory browse through it.
I was also recommended this paper by an old work colleague.
"Audio power amplifier design" has also been recommended to me.
What do you guys think / recommend to enable learning about these things? It seems that a lot of you are well versed in the ways of coercing electrons
|
Re: Learning about amplifiers
lol that is more than an email ?. ?Let me see what references I can find.? Best Regards,
Jules Ryckebusch?
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On Sep 17, 2024, at 13:54, Adrian Hicks via groups.io <mail@...> wrote:
? The basics of how they work. I've looked at your designs and from other conversations on here seen other schematics. I'd like to be able to read a schematic. Currently I can only work out the most basic elements such as filtering caps and voltage dividers but not the whole schematic.? It's analogous to being given a map but not having the ability to read it but being able to see the destination on it.
What are you wanting to learn in reference to them? I have built a few and just finished a 12 channel build.? I lot has shifted in the past 20 years specifically the use of Class D. My build used LM3886 chips? Best Regards,
Jules Ryckebusch? ? I¡¯ve been looking around to try to find some sources of material to enable me to learn about how amplifiers work.? I¡¯ve only got the most rudimentary electronics knowledge so end up floundering very quickly.? I bought The Art of Electronics a while ago and have had a cursory browse through it.
I was also recommended this paper by an old work colleague.
"Audio power amplifier design" has also been recommended to me.
What do you guys think / recommend to enable learning about these things? It seems that a lot of you are well versed in the ways of coercing electrons
|
Re: Learning about amplifiers
The basics of how they work. I've looked at your designs and from other conversations on here seen other schematics. I'd like to be able to read a schematic. Currently I can only work out the most basic elements such as filtering caps and voltage dividers but not the whole schematic.? It's analogous to being given a map but not having the ability to read it but being able to see the destination on it.
What are you wanting to learn in reference to them? I have built a few and just finished a 12 channel build.? I lot has shifted in the past 20 years specifically the use of Class D. My build used LM3886 chips? Best Regards,
Jules Ryckebusch? ? I¡¯ve been looking around to try to find some sources of material to enable me to learn about how amplifiers work.? I¡¯ve only got the most rudimentary electronics knowledge so end up floundering very quickly.? I bought The Art of Electronics a while ago and have had a cursory browse through it.
I was also recommended this paper by an old work colleague.
"Audio power amplifier design" has also been recommended to me.
What do you guys think / recommend to enable learning about these things? It seems that a lot of you are well versed in the ways of coercing electrons
|
Re: Learning about amplifiers
What are you wanting to learn in reference to them? I have built a few and just finished a 12 channel build. ?I lot has shifted in the past 20 years specifically the use of Class D. My build used LM3886 chips? Best Regards,
Jules Ryckebusch?
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Show quoted text
On Sep 17, 2024, at 13:42, Adrian Hicks via groups.io <kartparts@...> wrote:
? I¡¯ve been looking around to try to find some sources of material to enable me to learn about how amplifiers work.? I¡¯ve only got the most rudimentary electronics knowledge so end up floundering very quickly.? I bought The Art of Electronics a while ago and have had a cursory browse through it.
I was also recommended this paper by an old work colleague.
"Audio power amplifier design" has also been recommended to me.
What do you guys think / recommend to enable learning about these things? It seems that a lot of you are well versed in the ways of coercing electrons
|
Learning about amplifiers
I¡¯ve been looking around to try to find some sources of material to enable me to learn about how amplifiers work.? I¡¯ve only got the most rudimentary electronics knowledge so end up floundering very quickly.? I bought The Art of Electronics a while ago and have had a cursory browse through it.
I was also recommended this paper by an old work colleague.
"Audio power amplifier design" has also been recommended to me.
What do you guys think / recommend to enable learning about these things? It seems that a lot of you are well versed in the ways of coercing electrons
|
The firstone I printed was a bit tight, but I just reduced the size by a fraction and it worked fine. I used a 0.2mm layer height.??? A dab of silicone grease will help (for pla).
The scrolling spectrograms was just an idea to produce something to embed in other videos, so I can label specific frog calls.
it has had some significant work in the last couple of months.
Be sure to use the 'click' branch.
I will write a tutorial this weekend, it's been on my list of things to finish.....
How did you find the threads?printed? I had to do quite a bit of cleanup to get them to even go in, never mind smoothly.
I'm now also massively interested in your code for the spectrogam?video generation, that could be a world of fun.
SUre can.
If you need to adjust the model, or tune it for your printer, you can use the scad file, you'll need OpenScad.
Regards
Hi Matt,
I'm not wise enough to chime in on the acoustic properties, but having looked around at the commercial offerings for EM272 caps, it doesn't seem so critical with Omni's.? I have printed some enclosures akin to Pluggys / Usis which thread into a Neutrik housing (M17 X 1mm thread in case anyone is interested) and can share the files later when I am back home. I'd be interested to see how you did the blimp as I've played with a few designs by they seemed a little too fragile in PLA.? Micbooster sell Rycote lyres that fit the Pluggy housings and also ones that fit the XLR housings, these could be suitable, or even inspiration for your own designs.
Adrian?
Hi all, I've built several simple P48 AOM5024 microphones for field recording and recently designed and 3D printed a large blimp cage (180mm OD, 400mm long). I'm now at the stage where I want to use commercial mounts inside the blimp. I¡¯ve noticed that many microphones tend to be around 20mm in outer diameter, which seems to align with the size of XLR connectors. I'm considering 3D printing the microphone enclosures myself and wanted to ask for advice on a few points: Size and Length: Does the size or length of the enclosure significantly impact the microphone's performance or characteristics? Material Density: I have access to both PLA (rigid) and TPU (flexible) for printing. Does the material density or rigidity play a role in how the microphone performs, particularly in field recording environments?
Any insights or recommendations would be greatly appreciated! Thanks in advance for your help. Best regards,
Matt
--
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Re: Electret cap question.
THANK YOU Jack and Arjay for the quick primer on self noise. I appreciate the direct information - it appears to be more significant than I thought. Happy days, gents. James
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How did you find the threads?printed? I had to do quite a bit of cleanup to get them to even go in, never mind smoothly.
I'm now also massively interested in your code for the spectrogam?video generation, that could be a world of fun.
SUre can.
If you need to adjust the model, or tune it for your printer, you can use the scad file, you'll need OpenScad.
Regards
Hi Matt,
I'm not wise enough to chime in on the acoustic properties, but having looked around at the commercial offerings for EM272 caps, it doesn't seem so critical with Omni's.? I have printed some enclosures akin to Pluggys / Usis which thread into a Neutrik housing (M17 X 1mm thread in case anyone is interested) and can share the files later when I am back home. I'd be interested to see how you did the blimp as I've played with a few designs by they seemed a little too fragile in PLA.? Micbooster sell Rycote lyres that fit the Pluggy housings and also ones that fit the XLR housings, these could be suitable, or even inspiration for your own designs.
Adrian?
Hi all, I've built several simple P48 AOM5024 microphones for field recording and recently designed and 3D printed a large blimp cage (180mm OD, 400mm long). I'm now at the stage where I want to use commercial mounts inside the blimp. I¡¯ve noticed that many microphones tend to be around 20mm in outer diameter, which seems to align with the size of XLR connectors. I'm considering 3D printing the microphone enclosures myself and wanted to ask for advice on a few points: Size and Length: Does the size or length of the enclosure significantly impact the microphone's performance or characteristics? Material Density: I have access to both PLA (rigid) and TPU (flexible) for printing. Does the material density or rigidity play a role in how the microphone performs, particularly in field recording environments?
Any insights or recommendations would be greatly appreciated! Thanks in advance for your help. Best regards,
Matt
--
|
SUre can.
If you need to adjust the model, or tune it for your printer, you can use the scad file, you'll need OpenScad.
Regards
Hi Matt,
I'm not wise enough to chime in on the acoustic properties, but having looked around at the commercial offerings for EM272 caps, it doesn't seem so critical with Omni's.? I have printed some enclosures akin to Pluggys / Usis which thread into a Neutrik housing (M17 X 1mm thread in case anyone is interested) and can share the files later when I am back home. I'd be interested to see how you did the blimp as I've played with a few designs by they seemed a little too fragile in PLA.? Micbooster sell Rycote lyres that fit the Pluggy housings and also ones that fit the XLR housings, these could be suitable, or even inspiration for your own designs.
Adrian?
Hi all, I've built several simple P48 AOM5024 microphones for field recording and recently designed and 3D printed a large blimp cage (180mm OD, 400mm long). I'm now at the stage where I want to use commercial mounts inside the blimp. I¡¯ve noticed that many microphones tend to be around 20mm in outer diameter, which seems to align with the size of XLR connectors. I'm considering 3D printing the microphone enclosures myself and wanted to ask for advice on a few points: Size and Length: Does the size or length of the enclosure significantly impact the microphone's performance or characteristics? Material Density: I have access to both PLA (rigid) and TPU (flexible) for printing. Does the material density or rigidity play a role in how the microphone performs, particularly in field recording environments?
Any insights or recommendations would be greatly appreciated! Thanks in advance for your help. Best regards,
Matt
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Re: Electret cap question.
On Sun, Sep 15, 2024 at 10:50 PM, Richards wrote:
is capsule self-noise a controlling specification?
As already pointed out, affordable recorders with low noise mic preamps are widely available now, so that's no longer the dominant source of system noise for most of us.
?
In the studio, you're usually placing mics close to relatively loud things, which helps override mic self-noise. (but of course lower noise equates to more clarity and dynamics, and noise is cumulative,? so lower noise is still valued here)
?
Capsule self-noise becomes a controlling specification when you're interested in recording very quiet things, like natural ambiences. A quiet natural environment clocks in at 20 dBA or less; if your mic's self-noise is, for example, approx 18dBA, then your mic's own noise is going to be very present in the recording, marring it. Whereas if your mic's self noise is 14 dBA or lower, it will be less present in the recording.?
?
(And the natural ambient noise is what we're usually wanting to record.)
?
Arjay's link to Neumann is a great overview of mic self-noise.
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Re: Electret cap question.
On Sun, Sep 15, 2024 at 04:10 PM, kennjava wrote:
A decade or two ago, we were all raving about Panasonic WM-61 omni capsules, right? And rightly so; they were pretty amazing for the price.?
?
I stared using Primo EM158 mics once the WM61s (that weren't fake! ) became difficult to find.?
It was quite? agood capsule... quieter than the wM61 .. but it was very senstive to overvoltage.
Repleced now with the EM258.? Quite a bit 'brighter' than the WM61 -- but definitely quieter.
?
Where the project can stand the budget - and you have the space for a 16mm capsule -- I prefer the EM204 or EM200 ..... They're in a different league!
?
I did come across a (genuine) WM61 in my mic box? the other day. They really were pretty good. A little bit noisier than some modern devices, but still a really nice sounding capsule !
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Re: Electret cap question.
This page from Neumann has some useful information on mic self noise : ?
?
On Mon, Sep 16, 2024 at 06:50 AM, Richards wrote:
Novice Question - Noise Floor Figures -
I see many microphones and capsules rated between 14 and 22 dB "self noise" (in layman's terms)
Given the relative importance of the ratio of Signal-to-Noise, and considering the rigors of working outside a treated studio ... is capsule self-noise a controlling specification? I mean, won't the other sources of noise, e.g., ambient environmental noise, electronic noise from the recording device, and etc., render the capsule's self noise immaterial?
(I am looking for a general, elementary and not a thread-derailing answer . . .) :-)
THANKS LOADS - James
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