PopularFX
Home Help Search Login Register
Welcome,Guest. Please login or register.
2026-08-15, 06:38:56
News: Registration with the OUR forum is by admin approval.

Pages: [1]
Author Topic: Logic behind the 15" diameter TPU  (Read 6285 times)
Topic Options img
img  darkspeed
Logic behind the 15" diameter TPU « on: 2010-04-17, 07:06:22 »
Hero Member
*****

Posts: 812
Anyone know why he used 15"?

Pulse stacking??? Stacked pulses create a pulse sweep???

The wavelength of the seventh harmonic of 35.7 is almost devisable by 47.1" ( 15" x 3.14)  could be pulse stacking....

I cant find any reason for 15"

maybe he had some of these laying around his speaker shop?

« Last Edit: 2010-04-18, 04:19:27 by darkspeed »
   
img  Grumpy
Re: Logic behind the 15" diameter TPU « Reply #1 on: 2010-04-17, 14:52:02 »

Group: Tinkerer
Hero Member
*****

Posts: 4265
tExB=qr
I don't think there is any particular reason the he used 15" - probably like you suggested - he had speaker rings available
   
img  darkspeed
Re: Logic behind the 15" diameter TPU « Reply #2 on: 2010-04-17, 18:24:31 »
Hero Member
*****

Posts: 812

pi - 3.14159265

3.14159265 * 15"
= 47.12388975"
 
330011.23513859464" wavelength of 35.7806khz

47144.462162656377" 7th harmonic of wavelength of 35.7806khz

47144.462162656377" / 47.12388975"
= 1000.4365601559107
 
---------------------------------------------------------------------------


almost a function of 1000 and evenly divisible



or....




47144.462162656377" / 1000
= 47.144462162656377"
 
47.144462162656" / 3.14159265
= 15.00654840233866"

15.00654840233866" at 1000


???



 or...

for exactly 15"

15 * 3.14159265
= 47.12388975"
 
47.12388975" * 7000
= 329867.22825"

329867.22825" is the wave length of : 35.805386563275khz  ??? did i get that right?



Collector diameter equals power ? 15" tpu is x1000 ? < actually that would be inverse as a 7.5" tpu would be a function of 2000


>> a lot of interesting reading on transformer theory and the 7th harmonic <<

« Last Edit: 2010-04-18, 03:13:51 by darkspeed »
   
img  Grumpy
Re: Logic behind the 15" diameter TPU « Reply #3 on: 2010-04-18, 14:50:08 »

Group: Tinkerer
Hero Member
*****

Posts: 4265
tExB=qr
propagation velocity and wavelength are variable depending on the properties of the medium - often much slower than C
   
img  wings
Re: Logic behind the 15" diameter TPU « Reply #4 on: 2010-04-18, 15:07:25 »
Full Member
***

Posts: 118
   
img  darkspeed
Re: Logic behind the 15" diameter TPU « Reply #5 on: 2010-04-18, 17:03:02 »
Hero Member
*****

Posts: 812
The coil in the photo is 15 x 4 - 280 turns

Due to its self capacitanceit is less than 35khz , but a pair of wire clippers and a bout 6 hours of test-clip-test-clip-test-clip can fix that

Or - get it to its closest divisible and calculate a cap to correct it. < It came out at 96.5khz so it needed a 400pf cap



« Last Edit: 2010-04-19, 07:55:17 by darkspeed »
   
Pages: [1]
« previous next »


 

Home Help Search Login Register
Theme © PopularFX | Based on PFX Ideas! | Scripts from iScript4u 2026-08-15, 06:38:56