Hi, ... Plus 48V phantom power is coming from HOT (that's where it got it's name). ... Which would result in a system with quite a bad common mode noise ...
33
Dick Campbell
rhcamp0217
Dec 6, 2003 3:47 pm
... Remember that for 6mm range diameter capsules, the FET is not the predominant noise source, and the modification to allow source-follower operation does a...
34
Rich Peet
richpeet
Dec 6, 2003 4:30 pm
I guess I am the SPAM safeguard right now. Shortly, the group will be switched to a "restricted membership". Groups of this type get little or no spam. I will...
35
dnemeth01
Dec 6, 2003 5:41 pm
... you can hear the ... gain up to ... work with. I ... One problem, IMHO, with the panasonics is the size of the hole in the front. It is too small and can...
36
Rich Peet
richpeet
Dec 6, 2003 6:14 pm
I am uploading some photos of designs i currently use. Upload in progress as I have to find some of the photos. I will get to my electrical designs with time...
37
Bob Cain
arcaneznet
Dec 6, 2003 7:09 pm
... That's just what I thought. :-) ... No, it is changing the configuration of the internal FET to source follower from the as-shipped common source mode. ...
38
Bob Cain
arcaneznet
Dec 6, 2003 7:16 pm
... Yes, I understand that the larger you make it, the more specialized the market becomes. It's just that my interest has moved beyond tiny but noisy omni's...
39
Bob Cain
arcaneznet
Dec 6, 2003 7:25 pm
... As Jerry Avins in comp.dsp is so fond of saying, "Engineering is the art of making what you want from what you have." To that end I have worked out...
40
Klaus Wolter
fourcycleboxer
Dec 6, 2003 8:55 pm
When making larger microphones, I wonder how east it would be to roll your own? I took a little electret mic apart a few years back but don't recall exactly...
41
Bob Cain
arcaneznet
Dec 6, 2003 9:41 pm
... Ah, but therein lies the rub. From looking at noise specs for various size mics, from the experiments of one of our members, and according to: ...
42
Andrew Burgess
andypokermei...
Dec 6, 2003 10:08 pm
... Or adding more diaphragms. Two mics, twice the signal, noise goes up by 1.4....
43
Bob Cain
arcaneznet
Dec 6, 2003 10:57 pm
... Right. Either approach begins to degrade high frequency performance due to coincidence considerations. I'm not sure which is easier to manage. Bob -- ...
44
umashankar mantravadi
umashanks
Dec 7, 2003 12:59 am
only about the last point: the sony ecm 907 and others like it have more than an inch of wire from the capsule to the fet; the nakamichi cm 300 i have sitting...
45
Walter Knapp
waltknapp
Dec 7, 2003 2:47 am
From: "Rich Peet" <richpeet@...> ... I do nature recording, and would agree in general. However, I'd like to experiment with RF mics with diaphragms...
46
ktpbeng
Dec 7, 2003 7:38 am
Comments interspersed: snippage all over the place... My apologies, I did not follow this thread from the beginning... it may not all be on this list! :) ... ...
47
mstrong82
Dec 7, 2003 10:21 am
It's called mirrorlite, i have links at the office and will find them for you....
48
mstrong82
Dec 7, 2003 10:50 am
You guys want to use 1/2" or bigger. I want to use 6mm and 9.7 is huge in my application, but if it were that much better I would consider it. I'll help you...
49
Indrek Rebane
intu_bps
Dec 7, 2003 2:39 pm
... True, my mistake, now that I re-verified it, phantom power is usually supplied over both: HOT and COLD terminals. Trust but verify. Indrek -- Indrek Rebane...
50
Bob Cain
arcaneznet
Dec 7, 2003 4:50 pm
... The sole reason for bigger is to reduce self noise. If noise can be lowered to be in line with the larger capsules another way that would be great but...
51
Bob Cain
arcaneznet
Dec 7, 2003 4:54 pm
... Sorry, I missed this in my last response regarding directional capsules. Bob -- "Things should be described as simply as possible, but no simpler." A....
52
ljudatervinning
Dec 7, 2003 10:21 pm
Regarding connections on the capsule, i think 3-connections is the best way to go. Ground, source, and drain. In this case it's easy to use either...
53
grendeltooth
Dec 8, 2003 5:18 am
Hi, mstrong. I record church music, choral works and loud pipe organ. My WM55 XY mic is useful because it's diminuative enough not to intrude on the service....
54
Bob Rogers
gmhg41
Dec 8, 2003 4:40 pm
... Depending on your definition of "larger," you can cut the fronts of entirely fairly easily. I suppose it would be possible to drill a larger hole in some...
55
Indrek Rebane
intu_bps
Dec 8, 2003 5:31 pm
... Actually as capsules are made of quite thin aluminum, you can easily cut hole larger with sharp scalpel (which will not be so sharp after performing this...
56
Bob Rogers
gmhg41
Dec 8, 2003 6:37 pm
... Have you done that? There's not a lot of clearance between the face and the diaphragm. I don't think I would have much luck doing that sort of thing,...
57
mstrong82
Dec 8, 2003 8:21 pm
No, I haven't eliminated anything as far as directional or size. Someone was interested in better 55's, others in 1/2", etc. All are interesting. I must...
58
Bob Rogers
gmhg41
Dec 8, 2003 8:21 pm
... I think something that would be really great would be a capsule that ran off of 48v, so it could easily be run off phantom power. I know a lot of people on...
59
Bob Andres
bobandres
Dec 8, 2003 8:49 pm
This all sounds great. Any idea what these things will cost?...
60
Rich Peet
richpeet
Dec 8, 2003 9:59 pm
Thanks, you are doing great at balancing the feelings of the group against what is a dream and what is too expensive. You are also moving very fast which is...
61
Bob Cain
arcaneznet
Dec 8, 2003 10:01 pm
... Cool. ... Understood. ... Agreed. ... That's the theory but the definitive test comparing self noise at atmospheric to self noise in a vacuum would really ...
