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December 14, 2012
News - February Caption Contest |
about 3 weeks ago
Reel Flaming Duck Lip Selfie
1 in Stock
Product COM-12051 |
about 2 months ago
If you open the Datasheet, Rotate it, and zoom in on the ‘notes’ at the bottom of the page. The T/S Parameters are listed.
Revc = DC Resistance = 7.2Ω
Fo = Fs = 71.347Hz
Qms = 3.74
Qes = 0.719
Qts = 0.603
Vas = 2.084 Ltr
Sd = 5.411 m²
Md = 20.0g
BL = 6.674 T·m
no = 0.102 %
SPL = 81.1 dB
Cms = 501.249 µm/N
Mms = 9.927 g
Mmd = 9.698 mkg (mili-kilogram? in other words just gram)
Krm = 1.845 Ω (mechanical ohm)
Erm = 0.907
Kxm = 34.981 mH
Exm = 0.652
Le is frequency dependent and given with the following equation:
Le = Kxm · (ω ^ [Exm-1]) ; where ω = 2πf
Le @ 1kHz (nominal value usually listed)
ω = 2π · (1000) = 6283.1853
Le @ 1kHz = (34.981) · (6283.1853 ^ [0.652-1]) = 1.667 mH
Re is also frequency dependent and given with the following equation:
Re = Revc + (Krm + ω ^ [Erm])
As an aside, to get the graph that is on the data sheet (Impedance graph), you just need to combine the effects of Re and Le. The reactance of Le is given X = Kxm · (ω ^ [Exm]) and the inductive reactance is 90 degrees out of phase with Re we will have to use some imaginary number j. Voice coil Impedance = Zvc = Re + j·X
Yeah more than you asked for, but its never a bad time to get a learn on.
News - September Caption Contest |
about 6 months ago
News - Your August Caption Conte… |
about 7 months ago
Simone might be going to Paris, but I’m tellin' ya, we will find the bike in the basement of the Alamo.
News - So You Want to Learn FPGA… |
about 8 months ago
David Jones of EEVblog has just done a great introduction video on FPGAs
News - July Caption Contest |
about 8 months ago
If you think this is big, you should check out my solder wick.
Proper Soldering Technique - It’s no joking matter
Product DEV-11925 |
about 9 months ago
Check out Ponoko. They 3D print or laser cut designs from their showroom or from ones you upload.
You could do a picture frame type cut out to then hang from your wall. Something similar to the Heat Info System video.
Was looking into this display and found these videos:
arLCD Example Coding
Turning On/Off Lights
Vortex of Doom
*Heat Info System
Looks like an easy way to add a touch screen to my next project. Wish I would have known about this before I purchased one of the 4D Systems touchscreens.
News - Your June Caption Contest |
about 10 months ago
The Lillypad MP3 is Dino-mite!!!