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Lilmike's Mic - Page 3

post #61 of 119
Interesting, since the first mic I did, I was working on it for like 25 minutes and it was fine. The second mic took a whole 30 seconds and I didn't see any issues. It also measured fine with my meter when tested. The third mic which was closer to the first also took about the same amount of time as the second. I don't see how it could have been damaged soldering as quickly as I did, but who knows.
post #62 of 119
Thread Starter 
Might not be the soldering - the scraping of that lead can do it too.

Fixed schematic posted...and a new cable modem is ordered....so much for having the $$$ for a better calibrated mic....
post #63 of 119
Ah, I definitely wasn't as delicate scraping the leads on these. That probably did it to #2. #3 still outputs a good bit more signal than #1. Once I get all the parts for my EMM-6, I'll have lots of comparisons to post.
post #64 of 119
I added my mixer in to the soundcard calibration. The mixer start to fall off barely at about 200hz, then more at the lower frequencies. Soundcard with mixer is the purple line in the graphs. I didnt get a chance to do any regular sweeps to compare the 2 that way, but I will tomorrow.

Wem
LL
LL
post #65 of 119
I just ordered a few of the mic capsules. Thanks for making this available. How would I go about making the mic measurements in REW?
post #66 of 119
Thread Starter 
What do you have for a sound card?

Do you have a SPL meter?
post #67 of 119
I've got a Behringer UCA-202 and a Radioshack SPL meter.
post #68 of 119
Thread Starter 
Perfect. You have all the right parts.

The mic plugs into the left or right line in on the UCA, the amp plugs into the line out. Calibrate REWs level with the SPL meter and you're good to go.

There is a lot of info in the REW help file.
post #69 of 119
Thread Starter 
Oh, yeah.

This mic is not C weighted, and has no calibration file. Be sure to unchecked those options
post #70 of 119
Is there anything special to do to measure the response of the microphone, though, like the graphs that were posted earlier in the thread? Maybe I've just misinterpreted the graphs. Are they just to show the comparison among different mic's or do they actually show the response of the mic itself? I've done a few measurements using my Radioshack meter before(with ample help from the help files, which definitely are great).

Quote:
Originally Posted by lilmike View Post

Perfect. You have all the right parts.

The mic plugs into the left or right line in on the UCA, the amp plugs into the line out. Calibrate REWs level with the SPL meter and you're good to go.

There is a lot of info in the REW help file.
post #71 of 119
Thread Starter 
Those measurements are just performance comparisons. Measurements of the same speakers made with different mics.

Nothing to worry about. Uncheck C weighting and remove the cal file. More than accurate enough for a DIY effort.

Perfect? No.
Calibrated? No.

More accurate than anything under $100? Ohhh yeah.

Make more than one mic wand and compare them to weed out ones that got damaged during mods. I use RCA cables (typically car audio interconnects) for my mic leads, they work fine.
post #72 of 119
Great, thanks for the help. I'll make sure to post my results once I've built up a couple.
post #73 of 119
My 5hz calibrated EMM-6 and mic amp will be here on Monday. I should be able to get some good tests done.
post #74 of 119
I'm interested to see the results once you get the calibrated mic. I was thinking of building this mic and trying out rew for the first time.

as a p.s. I'm still hoping to see a lilmike's mfw-15 horn sub thread
post #75 of 119
You're on LI, if you want you can have one of the mics that I built.
post #76 of 119
Thread Starter 
Quote:
Originally Posted by kibe29 View Post

I'm interested to see the results once you get the calibrated mic. I was thinking of building this mic and trying out rew for the first time.

as a p.s. I'm still hoping to see a lilmike's mfw-15 horn sub thread

MFW Sub Plans are fixed (at least I found the error before I cut wood). Will be working on this soon.
post #77 of 119
Notnyt I would like one if you you can spare it. That would be greatly appreciated! I've never done any measurements but have always wanted to.

Lilmike -Thanks for the update! I like the dimensions and footprint you posted awhile back in another threas. If it's anywhere close to that it would work much better for me than the tht alternative I've been considering.
post #78 of 119
Quote:
Originally Posted by wembley2000 View Post
I am going to try something tonight, trying to run I through my head to see if it is possible maybe you guys can help. I want to try to make a cal file that includes my 502 mixer. If I run an rca from the line out to the mic in on the mixer via xlr to rca then out like normal I should get a cal file with the mixer inline correct? Maybe the mixer is messing something up.

Wem
I think this is the main reason that people's calibrated mic graphs are off. They don't perform a loopback calibration with the mixer/mic amp inline.

This is the EMM-6 measurement, with soundcard+mic buddy cal, and mic calibration.





Now, relative to this thread, here is a calibrated and properly configured EMM-6 compared to two WM-61A microphones.

EMM-6 vs WM-61A #1 (mic in pen tip, 10uF capacitor). These are very close up until just over 1khz.


EMM-6 vs WM-61A #2 (no mic extension, 4.7 uF capacitor).


Radio Shack C Weighted VS WM-61A VS Audyssey VS EMM-6


And here is a comparison between both WM-61A microphones.
post #79 of 119
Looks good notnyt, suprised to see your mic amp is so all over the place. Mine actually measure pretty good.

I have built 3 mics so far and one is not good, tried 3 different wm-61's with the bad one and they are all different from the 2 good ones. The other 2 measure close to each other but the one is down after about 40hz and higher after 40hz, I think I may have a bad capacitor on the board, going to build another board and see if that will fix the problem.

Wem
post #80 of 119
I think something is not right with your sound card calibration. I've never seen one look like that. Swings of almost 15db aren't normal. Are you sure that you did not have microphone input monitoring enabled when you took the cal? It should look much more like the mic cal or do you just have them labeled in reverse?
post #81 of 119
Quote:
Originally Posted by Ricci View Post

I think something is not right with your sound card calibration. I've never seen one look like that. Swings of almost 15db aren't normal. Are you sure that you did not have microphone input monitoring enabled when you took the cal? It should look much more like the mic cal or do you just have them labeled in reverse?

It generally helps when you measure without EQ. Woops. New graphs coming up in a few minutes.

This is through the soundcard and the mic buddy via the FR channel.
post #82 of 119
There you go.
post #83 of 119
Unsmoothed close mic comparison from 5-90hz of various mics
post #84 of 119
Hey mike!

It seems like I never have enough time to keep up with boards, and just ran into this. very clever.

I think I'll try it, but not for your intended purpose... You see I deal with church's and one of the things that ends up in most church basements is a typical HTIB and a projector. Well it'd be nice to have a mic every once in awhile just to get kids attention, but then that complicates things....

So, what if I take some of my $4 mics. (yea I purchased cheap-o superlux dynamic mics in case quantity at $4 each....) remove the guts, and install this inside? I'd then have a mic that would directly drive the line level input on the HTIB. sound reasonable?
post #85 of 119
Thread Starter 
Hey Jim.

How ya been?

That should work just fine. These are capable little mic capsules, and with the Linkwitz mod, they are simply amazing for the $$$ spent. Hardest part will be fitting it all in the casing.

If you're not working with High SPLs, you can skip the mod and make a simpler battery box, like this (just use 1/2 cause that one is a stereo setup).

You can actually drive these capsules directly off a typical laptop mic input, I use one like this for simple voice recording all the time. No accuracy for measurements cause laptop audio is typically pretty bad, but records voices pretty well.
post #86 of 119
Is there a way to make one of these things that a mixer board can power w/ 48v phantom power?
post #87 of 119
Probably easier to just use the preamp described here, rather than try and make phantom power work. :/
post #88 of 119
I want to build this microphone.
It will plug into an X-Fi Titanium, a PC Sound card.
Which attenuation should I use?

Thanks!

http://www.linkwitzlab.com/images/graphics/microph2.gif
post #89 of 119
None. Unless you're gonna do mad spl measurement.
post #90 of 119
The ohm rating on one of the resistors is "0," for no attenuation.

This is a stupid question, but I want to be sure:
That means NO resistor, right?

Quote:
Originally Posted by tuxedocivic View Post

None. Unless you're gonna do mad spl measurement.
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