Sorry for the probably newby question, I found a whole bunch of stuff on the web with different variations, but not sure how to adapt it to my needs (partial...
20174
Eric Benjamin
ericbenjamin2
May 12, 2013 7:24 pm
How you intend to package the MEMS capsules has a great deal to do with the answers to the other questions. If you intend to simply make ultrasonic ...
20175
Micha
michafeigin
May 12, 2013 7:55 pm
I'm trying to build a small scale airborne sonar, so I'm recording custom signals generated by a waveform generator. I'm currently intending to use 7 mics in...
20176
Eric Benjamin
ericbenjamin2
May 12, 2013 10:47 pm
I'm not trying to talk you out of using Phantom Power, but you could use one pair of batteries to power the whole array. All the grounds are attached ...
20177
LESLIE WATTS
wattsfurniture
May 13, 2013 10:36 am
Please note that the Knowles ultrasonic mic design has changed...it's now packaged in the zero height format. This changes the frequency response due to the...
20178
Micha
michafeigin
May 13, 2013 7:57 pm
I currently have a stock of the older version SPM0404UD5, but it's good to know in case I need more. I'm looking into the Alice circuit at the moment as it...
20179
Scott Helmke
scott_helmke
May 13, 2013 10:11 pm
Micha, The Alice mic uses a 3-terminal connection to the FET, ground, plus, minus. I think that should work for any 3-pole mic as long as the voltage and maybe...
20180
zephyrmic
May 15, 2013 12:44 am
Thanks for that info. I am planning to use your circuits for a couple of C12 type capsules I have. The polar pattern switching looks very interesting. Had a...
20181
Micha
michafeigin
May 15, 2013 6:35 am
Hi, I hope that I'm not going in the completely wrong direction. I tried working a bit with a circuit simulation to figure things out (www.circuitlab.com) I...
20184
rickshawrecords
May 18, 2013 5:31 am
Hey Groupies, My DIY True Blumlein Ribbon Mic Kit is tastefully reviewed in the current issue (#95) of Tape Op Magazine: ...
20185
Scott Helmke
scott_helmke
May 19, 2013 1:48 am
Micha, You can simulate phantom power by having a single 48vdc source feeding pins 2 and 3 through 6k8 resistors. That's the spec for phantom power. You have...
20186
sethinspain
May 19, 2013 2:11 pm
Hey micbuilders, Just a general/basic question that I am sure any of you folks could easily answer... I just bought a mixer and am making the PSU for it. It...
20187
Scott Helmke
scott_helmke
May 19, 2013 4:50 pm
You could just ignore the split supply thing, the center tap, and look at it that way. Two windings together (4.44A total?) feeding 200 opamps at 6mA each. The...
20188
pancaps4u
May 19, 2013 5:59 pm
Hi, Your troidal is rated around 80VA= V*A=36*2.2 (18*2V*2.2A =79.2VA) So the only thing you need to worry about is the total current capacity of the trafo! I...
20189
sethinspain
May 19, 2013 6:02 pm
Question answered! Thank you Scott!! Oh and any idea what percentage of current I'll be loosing due to regulation?...
20190
rpagala1
May 19, 2013 6:38 pm
I just replaced the capsule on my oktava mk219 because the icapsule got damaged. The capsule that I replaced it with is too bright, is there anyway to...
20191
Ken Lee
chabochampion
May 19, 2013 7:53 pm
Microphone Parts.com has a de-emphasis circuit that would probably work for that mic Sent from my iPad ... [Non-text portions of this message have been...
20192
tablesyrup.shorty
tablesyrup.s...
May 20, 2013 5:54 pm
I am having some issues.... I have Omni figured out by switching Wondering if someone can steer me to a good diagram of wiring/switching between...
20193
tablesyrup.shorty
tablesyrup.s...
May 20, 2013 5:55 pm
Perhaps I should specify Transformerless design...
20194
archieaa1
May 20, 2013 6:40 pm
Take a look in my file folder Archie's stuff. Archie...
20195
Mike Rooke
picnet2
May 20, 2013 7:06 pm
Funny you should ask I had my NT2A open earlier to check if its possible to gain access to both capsules independently converting it to dual output rather than...
20196
Micha
michafeigin
2:42 pm
Hi, Caught that typo with the 100 vs 100K, thanks. I don't see how to remove the jfet as it is used to get the balanced output. If the mic has an internal jfet...
20197
sethinspain
3:11 pm
Hey Pancaps, By anti-surge fuses, I assume 'fast blow' is what you're talking about? Actually, I am a bit confused regarding the fuses. Since I've only ever...
20198
archieaa1
3:43 pm
There are a number of things you can do to reduce inrush current. The simplest is to put a small value of R between the rectifier and the filter caps. Some...
20199
David Pickett
kriegerjoh
3:58 pm
... Actually, one usually employs a slow blow fuse to allow the high transient currents to flow without blowing a fuse. There is usually no danger of any...
20200
pancaps4u
4:41 pm
It is just the opposite! An anti-surge fuse is a slow blow fuse. I am not sure if this is also called a "Slow blow" fuse! This should be your main fuse to the...
20201
sethinspain
4:56 pm
You know, I've thought the same thing to myself here a couple times. If having these separate transformers all wired up to my mains IEC was going to cause...
20202
archieaa1
5:14 pm
Once again The formula you just quoted works only for the secondary winding and would be correct if you want to fuse the low voltage side. If you want to put a...
20203
pancaps4u
5:17 pm
Well,besides the cost of employing 3 trafos,consider the weight of the psu you'd be carrying! Unneccessarily complicated if you ask me! You can actually...
20204
pancaps4u
5:49 pm
Thanks for pointing this out,good catch! I stand corrected!...
