For those interested in mic preamps here is a cheap source for 2SK389: http://www.grandata.co.uk/ And suitable preamp: ...
9289
userno232000
Jun 11, 2008 10:15 pm
... I would add the offset servo from the seventhcircleaudio version of this. That unbiased 4000uF capacitor directly in the input should go....
9290
Jim G.
zapnspark
Jun 11, 2008 10:47 pm
... go. ... Scott & Jack, That 3900 uF polarized electrolytic cap in series with the gain setting resistor appears in many mic pre-amp schematics. It makes me...
9291
userno232000
Jun 12, 2008 12:34 am
... of ... should ... volt. ... scratching ... the ... You're right, but I don't like the bulk and if you go for a super low noise design the gain resistor...
9292
krokavadet
Jun 12, 2008 10:08 am
... of ... ribbon ... stuff... ... see if anyone ... Hi Mike, The LMV1012 seems to be aimed for applications like: Cellular phones, headsets, mobile...
9293
Richard Lee
ricardo_lee
Jun 12, 2008 10:47 am
... More exciting is they have 2sk117 which is 13p Ciss, 1.2nV/rtHz @ 1kHz & 500R rnv @ 18Hz Also 2sk118 ... This is yet another Cohen copy without its...
9294
David S
zephyrmic
Jun 12, 2008 12:28 pm
... 1kHz & 500R rnv @ 18Hz ... I ordered 2SK117 from http:\\www.futurlec.com.au yesterday for AU$0.24 each. Also 2SK170 for the same price. Other components,...
9295
userno232000
Jun 12, 2008 1:47 pm
... 1kHz & 500R rnv @ 18Hz ... There's a nice article in B&K's on line library on noise in capsules. Apparently their 1/2" capsules (arguably the best) bottom...
9296
userno232000
Jun 12, 2008 2:52 pm
To illustrate the point I ran a computation of the noise of a bias resistor and FET only assuming the FET was flat with frequency. These numbers would be the...
9297
Richard Lee
ricardo_lee
Jun 12, 2008 9:57 pm
... Mr Wurcer, could you point out which of the B&K articles is the one you mean or even a url to the correct one? Thanks...
9298
userno232000
Jun 12, 2008 10:47 pm
... capsules. ... purposes. ... It's Technical Review 1972-3, you need to register(it's the least hassle registration I've seen). In the library/technical...
9299
krokavadet
Jun 13, 2008 11:43 am
... 1kHz & 500R rnv @ 18Hz ... Got no response on my question on how to calculate gain and output impedance... Message 9272, june 5th. What about the input...
9300
gjallarhorn2004
Jun 13, 2008 12:07 pm
Hi all, uploaded some recordings I did recently with one of the mikes I've built in case you're interested: http://www.panphonic.com All the best, Martin...
9301
Hector Centeno
hmcenteno
Jun 13, 2008 4:22 pm
Hello, Is there any extra information available about this microphone? Thanks!...
9302
Jim G.
zapnspark
Jun 13, 2008 5:59 pm
... here? ... it ... Roger, The following 2 papers do not directly answer your questions on the cascoded 2 FET input stage. They are a detailed noise analysis...
9303
gjallarhorn2004
Jun 13, 2008 6:36 pm
... My hope is that it will become a commercial design or product some day, but I'll be happy to try to answer any specific questions you might have, so please...
9304
Richard Lee
ricardo_lee
Jun 14, 2008 9:25 am
... This is a huge file scanned at high resolution from the original. ... Thanks for this Mr. Wurcer and also for "Some noise calculations". The B&K article is...
9305
Richard Lee
ricardo_lee
Jun 14, 2008 9:38 am
... Jim, what's the exact www.diyaudio.com thread which has this good info? I tried to find it under "Gerhard" and "noise" with no joy....
9306
krokavadet
Jun 14, 2008 10:43 am
... the ... to ... info? ... I am not Jim but... You can look at "Solid State", "Blowtorch preamplifier" and go to page 262. Roger Gustavsson...
9307
picnet2
Jun 14, 2008 11:01 pm
Hei, 20 questions time.. Actually about 9 or so.. 1. What equipment did you use to make the recordings? (gear head question) 2 . Were the recordings post...
9308
gjallarhorn2004
Jun 14, 2008 11:47 pm
... question) Mike into a SoundDevices 744T recorder. ... The native output format is horisontal B-format on this version. ... My guess is that what you see is...
9309
handprintsoncavewalls
handprintson...
Jun 15, 2008 12:28 am
Does the to-18 or military packaging make a big difference in noise levels of a FET as compared to the to-92 civilian packaging?...
9310
Richard Lee
ricardo_lee
Jun 15, 2008 6:07 am
... Sheesh! And I thought Flamegirl and our pseudo Transformer Guru were OTT. Gurus Curl & co. are even nuttier. Messrs Wurcer, Gustavsson & Spark, you're...
9311
picnet2
Jun 15, 2008 9:08 am
Hi, Thank you for the answers :) ... Very interesting that trees would give such an ambience. Both questions were related. Time for the decay of the birdcall,...
9312
gjallarhorn2004
Jun 15, 2008 9:27 am
... Yes, perhaps we don't think of the woods as an echo chamber, but last summer I recorded an impulse response in the forrest and it did have quite a bit of...
9313
gjallarhorn2004
Jun 15, 2008 10:27 am
As I recently uploaded a picture of a much earlier prototype as well as some music samples recorded with it, here you go: ...
9314
John Lundsten
lundsten_john
Jun 15, 2008 12:03 pm
gjallarhorn2004 answered The native output format is horisontal B-format on this version. It's two capsules ... Facing 0 and 90 degrees. I'm confused as to how...
9315
Paul Doornbusch
pauldoornbusch
Jun 15, 2008 12:06 pm
Horizontal B-Format, just X and Y, presumably with a W... It's also called Blumlein... pd...
9316
gjallarhorn2004
Jun 15, 2008 12:19 pm
... capsules. This ... That's what I thought too, until I suddenly realized how simple it was! Martin...
9317
gjallarhorn2004
Jun 15, 2008 12:22 pm
... Not exactly, Blumlein is two capsules at +/- 45 degrees and the resulting output is two fig-8's (like X and Y only). My mike is 0 and 90 degrees with W, X...
