inductor difference

[kambo]

is there any difference between
using a one piece of inductor with multiple taps, ( ie: poorman eq with VTB9050)
vs
using single inductors connected series, or single values
in a passive EQ

thanks

 

[ruffrecords]

In terms of the value of inductance there is no difference. I use both methods in my REDD EQ. There might be some differences in performance of the two types of inductors but that is a different question.

Cheers

Ian

 

[CJ]

yes there is a difference,

probably not much, the shape of a bell curve may change a bit, if it is an RCL circuit,

a tapped inductor might use a core that will give the inductance needed for lower frequencies, so the hi freq inductor tap will be on a core that could be smaller if that hi freq inductor were used by itself,

so there might be differences in capacitance and DCR that can be lowered if using a smaller core for a hi freq inductor

 

[ruffrecords]

so there might be differences in capacitance and DCR that can be lowered if using a smaller core for a hi freq inductor

Spot on as usual CJ. I use a multi-tap inductor for the mid section of my EQs. I have several times noticed that the highest frequency turns out lower than expected and I had put this down to capacitance in the inductor. Hmmmm.....


Cheers

Ian

 

[kambo]

thank you both!
i think its best to try both and c the difference...
ordering some from Cinemag! and mouser

http://www.mouser.com/Passive-Components/Inductors/Fixed-Inductors/_/N-wpcz?P=1z0wpwcZ1z0t1rp

should i go for lower in "max resistance"

Tolerance is 10% on those  : i wonder whats is the Tolerance on multitap ones!

 

[bruno2000]

I tried winding one multi tap inductor for a Neve 1073 circuit instead of using the 2 inductors that Mr. Neve specified.  It didn't work out well at all.  I believe it was the extra C in the inductor.
My $0.02.
Best,
Bruno2000

 

[kambo]

on passive EQ

using larger value for the inductor with smaller cap values
vs
smaller inductor value with larger cap value

would be making any difference on EQ/curves ?

edit : i mean  for the same frequency!

 

[TheJames]

on passive EQ

using larger value for the inductor with smaller cap values
vs
smaller inductor value with larger cap value

would be making any difference on EQ/curves ?

edit : i mean  for the same frequency!

I'm far from an expert, but doesn't that change the Q?

 

[ruffrecords]

on passive EQ

using larger value for the inductor with smaller cap values
vs
smaller inductor value with larger cap value

would be making any difference on EQ/curves ?

edit : i mean  for the same frequency!

I'm far from an expert, but doesn't that change the Q?

Yes. Q = 2*pi*f*L/R

where pi, f and L mean the usual things and R is the overall circuit resistance of the RLC circuit, So for a given circuit, bigger L mean bigger Q.

Cheers

Ian