I realize this is an old post, but I'm wondering if anyone has more recent experience with a DIY mic and preamp using the Panasonic WM61 electret condenser mic, and any tips on how to use with REW. I thought it might be a fun little electronics project, and I found this page also has preamp designs, though I'm not sure which is simplest most appropriate... http://www.johncon.com/john/wm61a/
I already have a usable external USB sound card with Line In and Line Out (Diamond xs71U, http://tinyurl.com/a7eufjc , tested and gave a nice curve with REW), so would like to make both a mic and preamp circuit with 3.5mm jack, using one of the above designs or perhaps this one... http://www.madaboutsound.com/prod_det.asp?cid=112&sa=cf&ctid=4
I notice this site also has a calibration file, though I'm not sure if it's REW-compatible (file type is ".frd").
Looking for any DIY guidance/suggestions/tips, even if it's to say it's not a good idea & why. I like saving money and enjoy spending the time to build something if there is a reasonable chance of success, particularly since my interest is more for curiosity and learning, though I realize I might end up with something I could actually use for tweaking my sound system. onder:
I don't really have an answer for you, but I'm going to build one of these too using the instructions from Siegfried Linkwitz. He's got some info, a circuit diagram, modifications to the capsule, and a link to the Mic DIYers forum. Check here:
Before going to the trouble to build the Linkwitz mod, I thought I'd try using my 2-wire Audyssey mic first (speaker setup mic that came with my Onkyo receiver). At first I had no success trying to use it directly, but then I found the above page, so I used the circuit shown under the heading "Battery powered electret microphone" on that page to build a small box with just the 10uF capacitor, 2.2kOhm resistor, and a couple of 3.5mm jacks and on/off switch, which I was able to use for plugging in my Audyssey mic, and then cable that output into my sound card line-in jack. It gave me decent levels that I could use with REW to generate curves and compare speaker responses and tweak some of the crossover settings in my receiver, all using mostly parts I already had laying around. Also wondering if this same approach would work for a PC mic I have which might have three wires. The Audyssey mic is the small 1/4-inch size, but the PC mic is about 3/8-inch.
I may still try the Linkwitz method though.