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The world's simplest... Episode 2
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- čas přidán 18. 08. 2024
- Episode 2: A brief look the circuit and testing some various capsule alternatives with regards to frequency response and sensitivity. Headphones or earbuds recommended.
PS. Sorry about the pumping of the background noise, should have turned off the expander I'm using as part of the voice audio processing. Next time.
Link to the "SimpleP48" circuit mentioned:
content.instru...
Interesting project.
The mics with the 5K hump and gentle LF cut below 200Hz are trying to emulate the frequency response found on the professional lavalier/personal mics such as the Tram TR50, Sony ECM 50/55/77 etc and is intentional. The bass cut is there to compensate for the chest resonances boosting the LF. The upper mid peak compensates for the drop in level at those frequencies caused by the acoustic shadow created by the chin and jaw when the mic is placed near the sternum.
Some DPA (B&K) 4000 series electrets come with a slide on sleeve and grill which allows you to change the level of the 5K peak depending on if you want to use the mic mounted on the chest under the chin or in free space.
Amazing insight, thank you so much! Have some new capsules to test, still hoping to find one with a more flat response and decent S/N ratio.
@@NordicAudioLabs are you looking at a capsule for a particular application?
@@stevejones4061 Hi Steve, do you have a recommendation on a capsule for close mic situations on a musical instrument? I'm trying to build something close to a DPA instrument mic like the 4099
@@andybellklas1678 I can't think of any except the usual Primo capsules that are popular, but I've not gone down the directional route. Maybe you could pick up a second hand AKG747 and have have a go at modifying it's tube length - though you are on you own here. I always thought the noise level on the AKG a little high though.
The new AKG747 MkII price is ridiculously high for what is a basic electret, but the originals can be found for < £50, usually from ex TV news studios.
Your friend, Jordan, is going to love this! Great job, Martin! Wishing a glorious Resurrection Sunday to you and your family!
There were some pretty decent capsules in there. But I haven't seen an Primo caps. Those are pretty popular amongst builders. And I personally really like their sounds. Maybe in a future episode? Also JLI sells some very nice sounds capsules. Thanks for the video regardless!
Hi Dustin, I've now tested some from JLI and I'm aware of the Primo quality. Have indeed found some decent ones, but unfortunately not as flat as the WM-61. There are ways to deal with that, could be material for another video, but my day job (with microphones) has kept me super busy.
@@NordicAudioLabs I agree, the WM-61 is has a great response. and absolutely doesn't break the bank. So for a good quality DIY microphone the WM61 is one to seriously consider.
Even with a simple P48 or your circuit (you need a name 😉) and a donor body you can make a very good electret condenser mic.
I'll have to pic one up to play around with it , i'm thinking lavalier.. because a ⌀6mm is nice and small.
I absolutely love your videos Martin! I get so inspired. Please keep it up!
I'd love to see you take this project transform it into an inexpensive Ultrasonic microphone(¿array?). There are a lot of interesting things to be heard in the 100kHz range.From insects and bats to ultrasonic vibrations in industry.
Thank you very much, looking forward to continuing!:)
Great video, thank you. I'm really fond of the AOM-5024 series of capsules and I would really like to see how they perform (and compare with the others) in your testing setup.
Ok, got it, it was actually on my list already!
Thanks for a very interesting video. Although it would complicate things, capsules 2, 4, 6 could be filtered to remove the peak. Capsule 4 would be a good candidate for a simple filter because it has such a high output to begin with. A passive filter could reduce the signal but then there would be a nice smooth response.
Primo EM200 and EM204 are great ones, not ruller flat, but no crazy dips and boosts, great low end, and they are cardioids.
It seems that buying Primo for DIY is not so easy, do you have a source? Will focus on omnis to begin with, but who knows where this goes :-)
@@NordicAudioLabs micbooster site, or a guy on ebay, he is also a member in yahoo mic builders group. I won't mention his name here, but it should be easy to figure out. The same name he uses on eBay.
@@NordicAudioLabs I had contact to Primo Microphones GmbH in Germany via info[at]primomic.de about 2 weeks ago and asked about pricing for EM204 capsules. They wrote back within 2 or 3 days. It seems they also ship small amounts. I don't know exactly because I just collected information for a future project. There is a big discount on larger numbers though. Primo has a bunch of capsules which would be worth comparing. EM272 omni is very nice ...
This is so great, I have a few old AKG mics with the CE33 capsules. Could test this with those.
Finally got to test it and it works
it is really great video..
How did you get the frequency response of each microphone?
Could you explain how to configure and get the frequency response as you did?
A great candidate would be a primo 272 [also pretty cheap on micboosters I think can be bought for around 10£]!
What are you using to actually test the freq response? Also, what software are you using for capture/displaying the results.
Simple indeed. What a great result. All the other tutorials on this show an ac-coupling capacitor to remove the DC component. Since one side of the phantom power is loaded, there will be a small dc offset along with the microphone voltage - if there is no ac-coupling capacitor, then why doesn't the op amp multiply the dc offset as well?
Sorry for the late reply. Mic pre-amps are not DC-coupled, so the offset is ignored.
Amazing content, really helpfull and very entertaining. I do have one question since i would like to test build my own drum mic set. I am looking at the Shure Beta 98 (swan neck) and the Earthworks DM20. Would the Panasonic WM-61A be a great choice? Or would you recommend something else for a build, that can handle the loudness of a snare drum and toms?
Would be amazing to hear your thoughts maybe in your 3rd video what you think each capsule could work great for.
Its hard to find public content like this to start a project and have some info/resources to start to build.
Thanks again! And Im looking forward to your next video. :)
"I'm such a nerd." LOL :D
OK, I give up posting a link, please look for the JLI-61A mic capsule. It is recommended as a good replacement for the WM-61A. Please test it if possible and see if that is true.
Thanks, I noticed your post and how it disappeared suddenly! Will try to order some of those as well, good suggestion. Found the JLI website.
@@NordicAudioLabs Great, it will be interesting to see the results, Thanks.
@@mavamQ The cheapest shipping would be $39. Any chance somebody could put a capsule or two in an envelope and mail it to me? I can pay by PayPal for your expenses. My contact details and address can be found on our website.
@@NordicAudioLabs I'll get some on order today. Edit: I placed the order. Just to make sure you are in Karpero Finland, right?
@@mavamQ Correct! Please include your PayPal email when you mail me, thank you so much!
Good morning, could you show the setup you used to carry out the tests, how did you see the frequency curves?
Very interesting. Can you describe measuring configuration so we can test out our microphones?
So, I went on a search and yes, CZcams is blocking certain links, I didn't understand the details. I hope you can find the microphone capsule and site, with what I got posted.
Great video! What software are you using for visualizing the frequency response?
It's a measurement system from Audiomatica called CLIO. HW and SW.
Absolutely brilliant! Does anyone know, what capsules they use on those cheap behringer measurement mikes? They are decently flat.
Very interesting! Will you be able to do some videos regarding piezo pickup? and how small is the smallest possible to be able to produce a sound, and does shape really matter? What kind of piezo material are used?, I know there are lots of piezo ceramic materials like pzt 4, 5, 8 and more. Thank you and more power to you sir.
Hi i'm trying to make my own condensor contact mic like the AKG C411PP, would you know how this mic works? Do you think they just put a condensor in a little box or is there more to it to make it 'contact'? ty
How do you measure your frequency response of each microphone?
For a 3rd video, I would be interested in your test setup. I know that opens up a can of worms as far as this wrong that is wrong, but I have no idea how you are doing the frequency response curves.
I'll try to show you my setup in action if possible, don't know when but at some point for sure. It's really busy these days.
Hi, for 48v phantom power , before video 1 the correct way for resistor 27k put in it to pin 2 and 1 pin ?
Now I have a question; I try this one , I have a wireless microphones and I have this idea to transform a mic 2.4ghz for wireless phone , I cut a capsul mic to put XLR femal and when I test it with statique microphone powered with AA battery inside , it work but but buzzing noise floor .. what I can do to remove it , a hardware solutions thanks 🙏 I think with resistor to drop 2.7v to 0v because in origine this powered a capsule mic . What resistor Gona be 2k ? And wher I put it ? Thanks 🙏👍 🕯️
Would it be possible to wire three of these capsules to one xlr plug in order to capture a broader area? I imagine just connecting the same poles of the capsules with 1 wire and the other poles with the other wire would transfer the sound of all? Or am I messing up here? :)
Do I miss something but where is your tone-generator?
have you tried out any of the primo capsules? the em258 is supposed to be a good substitute for the wm-61a.
WM61 is hard to get... but WM52 is quite easy to get...
and here are some other very cheap ones:
www.pollin.de/bauelemente/aktive-bauelemente/kondensator-mikrofone/
Thanks, I'll look into the 52.
When is episode 3 coming out? sPL or noise floor reduction? I have the bits on my desk and want to build!
I've been so incredibly busy building my commercial microphones, but hope to return to this soon.
Since the legendary original Panasonic WM61A is hard to get theese days:
Maybe it would be interesting to buy some chinese copies, compare them to your original one and judge, if they are really that bad ;-)
I'm curious about the self noise of mics, you touched on it for a later video. I have looked at mics and see the Rode NT1 is probably the lowest self noise mic available. It is a full 1" capsule size microphone and costs 100X more then the jli-61A. Just wonder how the smaller capsules compare for noise.
Will definitely address the noise issue, from more than one approach. The smaller capsule means less signal and therefore more noise. Wish I could give this quest more of my time instead of just a tiny slice, but there are other mics to build :-)
Do you think this could power 7 mics with individual channels?
do you have a noise gate turned on?
Which software you are using for this ????
For recording the video? OBS Studio.
I have commented 3 times and when I go back to see it, it is not here.