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-  声学楼论坛  (http://874085.11480.vipsjym.com.my3w.com/bbs/index.asp)
--  材料配件室  (http://874085.11480.vipsjym.com.my3w.com/bbs/list.asp?boardid=20)
----  L-PAD  (http://874085.11480.vipsjym.com.my3w.com/bbs/dispbbs.asp?boardid=20&id=13811)

--  作者:helen0507
--  发布时间:2008-8-22 21:09:30
--  L-PAD

請教各位DX, 哪裡有L-PAD銷售?


--  作者:XLB
--  发布时间:2008-8-23 10:02:12
--  

L-PAD为何物


--  作者:Acoustics
--  发布时间:2008-8-24 18:23:05
--  
For attenuation A (damping) use here a positive dB value as convention.
L-Pad Pic=     L-Pad Formula=

For attenuation A use here a negative dB value as convention.
L-Pad Formula=

Calculate the resistor network
The calculator below needs a positive value for A in dB

Impedance Z: ohms   
Attenuation A dB  
L-pad Single resistor
R1 = Rserial ohms R ohms
R2 = Rparallel ohms  
Ztotal ohms       Ztotal ohms

Calculate the attenuation

Impedance Z: ohms 
R1 = Rserial ohms
     
 
Attenuation A dB  
Ztotal ohms  
dB Z R1 (ohms) R2 (ohms)
  -3 4 1.17 9.70
  -6 4 2.00 4.02
  -9 4 2.58 2.20
-12 4 3.00 1.34
-15 4 3.29 0.87
  -3 8 2.34 19.39
  -6 8 3.99 8.04
  -9 8 5.16 4.40
-12 8 5.99 2.68
-15 8 6.58 1.73

--  作者:helen0507
--  发布时间:2008-8-25 15:27:03
--  

在哪裡可以買到?