Re: Felted wool wind screens
This was my first real felting project! It's very beginner friendly :)?
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Re: Felted wool wind screens
This is great! One of my projects for 2024 is to do a wind screen/DeadCat instructable and really dive into both how to make these and the acoustic properties for how they work.?
Great work!
Hello all,?
I thought I'd share my diy wind screens. They cost probably less than 50c each to make, are suitable for beginners to felting and do a fantastic job.?
For the basic shape I wet felted them - basically wetting the wool with very soapy water, shaping them around the mold (a housing for a sound sleuther mic i made covered in in foil), and agitating it until it roughly felted together. Let dry, rinse soap off and let dry again. Then I took it off the mold, used a felting needle to tidy it up and fill in the thinner patches. For the dead cat style screens I loosely felted long pieces of felting wool in piece by piece until it looked like a troll doll. Overall less than two hours work each. They don't shed much at all either. If you are frugal and hate plastics like me it's a very feasible option.
  
-- Best Regards,
Jules Ryckebusch
214 399 0931
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Re: Felted wool wind screens
Helena, that¡¯s pretty sweet. I know nothing about felting but I¡¯d like to give it a go.
Hello all,?
I thought I'd share my diy wind screens. They cost probably less than 50c each to make, are suitable for beginners to felting and do a fantastic job.?
For the basic shape I wet felted them - basically wetting the wool with very soapy water, shaping them around the mold (a housing for a sound sleuther mic i made covered in in foil), and agitating it until it roughly felted together. Let dry, rinse soap off and let dry again. Then I took it off the mold, used a felting needle to tidy it up and fill in the thinner patches. For the dead cat style screens I loosely felted long pieces of felting wool in piece by piece until it looked like a troll doll. Overall less than two hours work each. They don't shed much at all either. If you are frugal and hate plastics like me it's a very feasible option.
  
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Re: Felted wool wind screens
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Hello all,? I thought I'd share my diy wind screens. They cost probably less than 50c each to make, are suitable for beginners to felting and do a fantastic job.? For the basic shape I wet felted them - basically wetting the wool with very soapy water, shaping them around the mold (a housing for a sound sleuther mic i made covered in in foil), and agitating it until it roughly felted together. Let dry, rinse soap off and let dry again. Then I took it off the mold, used a felting needle to tidy it up and fill in the thinner patches. For the dead cat style screens I loosely felted long pieces of felting wool in piece by piece until it looked like a troll doll. Overall less than two hours work each. They don't shed much at all either. If you are frugal and hate plastics like me it's a very feasible option.   
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Re: Cheap USB powered condenser microphone. Need advice on design.
When I looked into "USB Soundcards" I found they are based on chips that combine an op-amp mic preamp, A to D converter, and USB interface with power drawn from USB. The converters were 16 bits at 41 or 48 KHz. Fidelity was sacrificed for low cost and minimum external parts count. Performance ranged from acceptable for video chat, to really awful. I didn't experiment further, since even the cheapest XLR input interfaces offer better audio.
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Is Amazon available in your area? eBay? AliExpress? There are DIY oriented sellers there who have the 2N5457 and 2SK596 JFETs for sale in small quantities. The 2SK596C is made specifically for mics and is an easy addition to any capsule without an internal FET. Amazon also has transistor, resistor, and capacitor assortment kits which are handy when throwing a quick circuit together. Be aware that there can be scams and fake parts on these sites, but I have only had one case of fake op-amps out of dozens of purchases and they were so cheap it wasn't worth filing a dispute.
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The following files and folders have been uploaded to the Files area of the [email protected] group.
By: G?ran Birgersson <goeran@...>
Description:
I¡¯m new to the group and impressed by the knowledge and experience here!
I have some questions about Primo EM23:
I asked Primo about phantom 48V, and got two ¡®answers¡¯:
which of the two suggested circuits is preferred? i.e. one or two capacitors?
Then about the FET 2SK118 O1 - this one is no longer available, and the replacement, suggested by Primo, is only sold in quantities of 2,500 from Mouser:
any suggestions of alternative FET or where the 2N5457 can be bought by piece?
In general, should the electronics be close to the mic capsule or close to the recorder, i.e. inside the XLR, when (5 to) 10 meters in between? I do mainly nature sound recordings ¡
/G?ran Birgersson
G?teborg, Sweden
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The following files and folders have been uploaded to the Files area of the [email protected] group.
By: G?ran Birgersson <goeran@...>
Description:
I¡¯m new to the group and impressed by the knowledge and experience here!
I have some questions about Primo EM23:
I asked Primo about phantom 48V, and got two ¡®answers¡¯:
which of the two suggested circuits is preferred? i.e. one or two capacitors?
Then about the FET 2SK118 O1 - this one is no longer available, and the replacement, suggested by Primo, is only sold in quantities of 2,500 from Mouser:
any suggestions of alternative FET or where the 2N5457 can be bought by piece?
In general, should the electronics be close to the mic capsule or close to the recorder, i.e. inside the XLR, when (5 to) 10 meters in between? I do mainly nature sound recordings ¡
/G?ran Birgersson
G?teborg, Sweden
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I¡¯m new to the group and impressed by the knowledge and experience here in the group! I have some questions about Primo EM23:
I asked Primo about phantom 48V, and got two ¡®answers¡¯:
and
which of the two suggested circuits is preferred? i.e. one or two capacitors? Then about the FET 2SK118 O1 - this one is no longer available, and the replacement, suggested by Primo, is only sold in quantities of 2,500 from Mouser:
any suggestions of alternative FET or where the 2N5457 can be bought by piece? In general, should the electronics be close to the mic capsule or close to the recorder, i.e. inside the XLR, when (5 to) 10 meters in between? I do mainly nature sound recordings ¡ Cheers! /G?ran
G?ran Birgersson G?teborg, Sweden
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Re: Cheap USB powered condenser microphone. Need advice on design.
Ah yes, I noticed and corrected the capacitor polarity issue on the breadboard implementation. However, I ran into some trouble getting an actual output out with these c-media usb interface chips (the cm108 is especially bad). So I moved on to using a cheap soundcard commonly available through aliexpress and maybe local vendors which utilizes the cm6206 (blue 5.1 soundcard from aliexpress) audio interface chip. Turns out these chips are designed to take in mic level inputs so the second amplification stage may be completely unnecessary in the original design. The non-faraday caged audio output seems promising but the AC mains hum is prominently present in the output after inspection through an Audacity spectrogram. I'll provide more updates as soon as I get a proper soldering station to wire up a perfboard implementation. As for the +/- 15V the supply voltage was basically DC (from oscilloscope readings) after being filtered by some bypass capacitors and low pass filters. I will definitely add a ground plane in the final PCB implementation.
Best regards,
Timothy Aguana
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Re: Cheap USB powered condenser microphone. Need advice on design.
L1, with associated capacitors is an EMI filter that both
prevents interference/noise coming from the USB connection to
pollute the mic circuit AND to prevent oscillation residues from
the switching converter to pollute the USB port.
Le 11/02/2024 ¨¤ 04:28, Dude a ¨¦crit?:
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May I inquire as to what the inductor, L1, is
doing is this application? I have been trying to utilize USBc
and lightning, for small electret capsules from iPhones and
relatively recent ?smartphones, and having some troubles.?
Here's a version of a USB powered Alice.? Comments
welcome since my ability to make errors is well known.
On Fri, Nov 17, 2023 at
8:30?AM Timothy Aguana < lolnetian@...>
wrote:
Hello, I've drafted up a DIY design that I think
could work to drive an electret capsule like the
TSB-2555B through the use of a DC-DC converter () to derive a
stepped up voltage from the 5V supply rail of a .?
The generated voltage of the microphone is fed into an
amplification circuit from the?
Presented below is the proposed amplification scheme:
Similar to the aforementioned OPA-Alice circuit, the
amplifier to be used is planned to be the OPA1642.
The USB soundcard to be integrated to the design
utilizes a CM108 IC with an input range of 2.88 V
pk-to-pk and a default input signal gain stage of 20dB
(gain of 10).
I am relatively new to the design of microphone
circuitry and this design is heavily inspired the by
videos and instructables from DIY Perkz and DJJules.?
I would like to ask for advice regarding the design
choices made and the validity/viability of the
proposed design.
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Re: Cheap USB powered condenser microphone. Need advice on design.
I think you've got C1 in there backwards - positive voltage from U1 output?
-Scott
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On 2/10/24 13:52, Mark Kahrs wrote: Here's a version of a USB powered Alice.? Comments welcome since my ability to make errors is well known.
On Fri, Nov 17, 2023 at 8:30?AM Timothy Aguana <lolnetian@...> wrote:
Hello, I've drafted up a DIY design that I think could work to
drive an electret capsule like the TSB-2555B through the use of a
DC-DC converter (IEB0105S12
<>)
to derive a stepped up voltage from the 5V supply rail of a USB
soundcard
<>.
The generated voltage of the microphone is fed into an
amplification circuit from the OPA-Alice circuit.
<>
Presented below is the proposed amplification scheme:
Similar to the aforementioned OPA-Alice circuit, the amplifier to
be used is planned to be the OPA1642.
The USB soundcard to be integrated to the design utilizes a CM108
IC with an input range of 2.88 V pk-to-pk and a default input
signal gain stage of 20dB (gain of 10).
I am relatively new to the design of microphone circuitry and this
design is heavily inspired the by videos and instructables from
DIY Perkz and DJJules.
I would like to ask for advice regarding the design choices made
and the validity/viability of the proposed design.
--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
"I have ceased distinguishing between the religious and the secular,
for everything is holy" - Joe Henry
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Re: Cheap USB powered condenser microphone. Need advice on design.
May I inquire as to what the inductor, L1, is doing is this application? I have been trying to utilize USBc and lightning, for small electret capsules from iPhones and relatively recent ?smartphones, and having some troubles.?
Here's a version of a USB powered Alice.? Comments welcome since my ability to make errors is well known.
On Fri, Nov 17, 2023 at 8:30?AM Timothy Aguana < lolnetian@...> wrote: Hello, I've drafted up a DIY design that I think could work to drive an electret capsule like the TSB-2555B through the use of a DC-DC converter () to derive a stepped up voltage from the 5V supply rail of a .? The generated voltage of the microphone is fed into an amplification circuit from the? Presented below is the proposed amplification scheme:  Similar to the aforementioned OPA-Alice circuit, the amplifier to be used is planned to be the OPA1642. The USB soundcard to be integrated to the design utilizes a CM108 IC with an input range of 2.88 V pk-to-pk and a default input signal gain stage of 20dB (gain of 10). I am relatively new to the design of microphone circuitry and this design is heavily inspired the by videos and instructables from DIY Perkz and DJJules.? I would like to ask for advice regarding the design choices made and the validity/viability of the proposed design.
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Re: Cheap USB powered condenser microphone. Need advice on design.
That should work. You should make sure you have a ground plane and chest don¡¯t know is how quiet the 5V to +\-15 chip you are using is ? Best Regards,
Jules Ryckebusch?
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On Feb 10, 2024, at 14:52, Mark Kahrs <mark.kahrs@...> wrote:
? Here's a version of a USB powered Alice.? Comments welcome since my ability to make errors is well known.
On Fri, Nov 17, 2023 at 8:30?AM Timothy Aguana < lolnetian@...> wrote: Hello, I've drafted up a DIY design that I think could work to drive an electret capsule like the TSB-2555B through the use of a DC-DC converter () to derive a stepped up voltage from the 5V supply rail of a .? The generated voltage of the microphone is fed into an amplification circuit from the? Presented below is the proposed amplification scheme: <dummyfile.0.part> Similar to the aforementioned OPA-Alice circuit, the amplifier to be used is planned to be the OPA1642. The USB soundcard to be integrated to the design utilizes a CM108 IC with an input range of 2.88 V pk-to-pk and a default input signal gain stage of 20dB (gain of 10). I am relatively new to the design of microphone circuitry and this design is heavily inspired the by videos and instructables from DIY Perkz and DJJules.? I would like to ask for advice regarding the design choices made and the validity/viability of the proposed design.
<newamp.pdf>
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Re: Cheap USB powered condenser microphone. Need advice on design.
Here's a version of a USB powered Alice.? Comments welcome since my ability to make errors is well known.
On Fri, Nov 17, 2023 at 8:30?AM Timothy Aguana < lolnetian@...> wrote: Hello, I've drafted up a DIY design that I think could work to drive an electret capsule like the TSB-2555B through the use of a DC-DC converter () to derive a stepped up voltage from the 5V supply rail of a .? The generated voltage of the microphone is fed into an amplification circuit from the? Presented below is the proposed amplification scheme:  Similar to the aforementioned OPA-Alice circuit, the amplifier to be used is planned to be the OPA1642. The USB soundcard to be integrated to the design utilizes a CM108 IC with an input range of 2.88 V pk-to-pk and a default input signal gain stage of 20dB (gain of 10). I am relatively new to the design of microphone circuitry and this design is heavily inspired the by videos and instructables from DIY Perkz and DJJules.? I would like to ask for advice regarding the design choices made and the validity/viability of the proposed design.
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Re: Wasn't MicBuilders originally on Yahoo?
Am 10.02.24 um 17:05 schrieb Jules Ryckebusch via groups.io: Hey George, it was on Yahoo Groups. And a fine example it is that there's life outside of Bezos' Empire of Evil. Still missing a few good groups, like the Zoom forum or the ambisonics forum, who have defected to where I shall never go. Ralf -- Ralf R. Radermacher - K?ln/Cologne, Germany Blog : Audio : Fotos :
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Re: Wasn't MicBuilders originally on Yahoo?
Hey George, it was on Yahoo Groups. That went away and we transitioned to this platform. Welcome back! ? Best Regards,
Jules Ryckebusch?
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On Feb 10, 2024, at 11:03, gakjazz@... wrote:
?I just signed up though this Groupsio platform but I think I used to be on this forum as I remember it as being on Yahoo or some other platform.
Is that right? If not Yahoo another host, perhaps?
Thanks
George Kaye
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Wasn't MicBuilders originally on Yahoo?
I just signed up though this Groupsio platform but I think I used to be on this forum as I remember it as being on Yahoo or some other platform.
Is that right? If not Yahoo another host, perhaps?
Thanks
George Kaye
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Helena
Dude
underwood
G?ran Birgersson
Timothy Aguana