could you design some form of variable filter to correct the peak and have a simple one pot 'tweeker' to calibrate it a particular capsule on the pre amp. the variation in response looks like pretty much the same shape peak just varying in amplitude. then calibrate them against a known accurate mic?
There is already a kit available. You can get the bare board, complete kit including mic capsule, or complete kit with plastic enclosure. Works very well, and has very low battery consumption.
http://www.highefficiencyloudspeakers.com/News.html
http://www.highefficiencyloudspeakers.com/News.html
Banned
Joined 2002
UPS messed up and shipped the prototype boards to the wrong state (Arizona instead of Georgia) and they have been rerouted to me and I should get them Monday.
Once the design is verified and tested, Vikash and I will work on putting together a kit. Hopefully a calibrated testing mic will be able to be offered with the WM61A module also.
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Brian
Once the design is verified and tested, Vikash and I will work on putting together a kit. Hopefully a calibrated testing mic will be able to be offered with the WM61A module also.
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Brian
I received the boards, but was too busy with the new LM3886 stuff to assemble it and test it. Here are some initial photos:
I will build up the test unit soon. Everything seems to fit great.
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Brian
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
I will build up the test unit soon. Everything seems to fit great.
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Brian
Banned
Joined 2002
jleaman said:
Thanks! Nothing is decided for the end purpose of these boards. A kit might be sold by me, or maybe just Vikash. I don't know if I have time to put together an ship out another kit, as I do have a full time job, not leaving time to do too many kits
There is a good chance that I would just be selling pcbs, while Vikash would be selling pcbs and kits with calibrated mics.I will work on assembling the unit soon, along with mailing out some boards to Vikash for testing.
Jason, if you want one of the prototype boards, we can work something out. I also found the pair of SMD Mini-A boards when I was going through my boxes.
An externally hosted image should be here but it was not working when we last tested it.
Drop me a mail and we can discuss this stuff. I forgot how small the miniA boards are (3"x2"), but I do remember how much heat they create
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Brian
Banned
Joined 2002
started assembly tonight. I got sidetracked with other things, and didn't finish, but I should be able to find time tomorrow night to finish assembly.
high resolution version:
http://chipamp.com/diyaudio/micpre-assembly-highres.jpg
I will take more pictures when I finish assembling the unit.
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Brian
An externally hosted image should be here but it was not working when we last tested it.
high resolution version:
http://chipamp.com/diyaudio/micpre-assembly-highres.jpg
I will take more pictures when I finish assembling the unit.
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Brian
Here's a mic preamp I've just finished. I recorded a few choice sequences on my Tabla (drums) to test it, and it works great at both gain levels.
To begin with, I would like the kit to include the PCB and components, including switch and either two RCA sockets, or 1 RCA and 1 BNC (preferred), a mic capsule (or two), brass mic wand, and BNC connector plug (or RCA).
I have yet to assess the feasibility of having the mic capsules calibrated. At this stage I think it may be superfluous, and that the generic calibration file floating around will be fine (and free!).
To begin with, I would like the kit to include the PCB and components, including switch and either two RCA sockets, or 1 RCA and 1 BNC (preferred), a mic capsule (or two), brass mic wand, and BNC connector plug (or RCA).
I have yet to assess the feasibility of having the mic capsules calibrated. At this stage I think it may be superfluous, and that the generic calibration file floating around will be fine (and free!).
An externally hosted image should be here but it was not working when we last tested it.
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