J
James Lerch
Greetings All,
I'm finally building a set of surround sound speakers for the house.
I'm currently working on fabricating the cross overs for the midrange
drivers.
The question is, how would you measure if an iron cored inductor is
going to saturate and cause a problem?
The golden rule for 'audiophiles' is air cored inductors only in the
signal path, but I need 5x 0.6mH inductors and that turns out to be
ALOT of magnet wire. (approx 270 feet of 20 gauge wire for 5 air
cored inductors.)
Being a pack rat, I've salvaged a bunch of toroidal cores out of
scrape 360watt SMPS. The cores were originally used as inductors on
the line input section. I've test wound one of these cores with ~8
feet of 20ga wire, and achieved my goal of 0.6mH. Here's a picture of
a bare core and my home made inductor if it helps:
http://lerch.no-ip.com/atm/Ind_Core.jpg (170KB)
At the moment, I am at the decision point of deciding between abiding
by the 'audiophile law' or just using the iron cored inductor.
If it helps, this inductor will be used as part of a Butterworth 3rd
order low pass filter, with a crossover frequency of 3Khz, driving an
8 ohm midrange speaker at no more than 50 watts rms.
Also, I can measure the impediance vs frequency over the audio range,
can I test the iron cored inductor at various amplitudes settings and
get an idea on the likely hood of core saturation becoming a problem?
Thanks in advance,
Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction, Testing, and Coating site)
http://lerch.no-ip.com/ChangFa_Gen (My 15Kw generator project)
Press on: nothing in the world can take the place of perseverance.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent.
Calvin Coolidge
I'm finally building a set of surround sound speakers for the house.
I'm currently working on fabricating the cross overs for the midrange
drivers.
The question is, how would you measure if an iron cored inductor is
going to saturate and cause a problem?
The golden rule for 'audiophiles' is air cored inductors only in the
signal path, but I need 5x 0.6mH inductors and that turns out to be
ALOT of magnet wire. (approx 270 feet of 20 gauge wire for 5 air
cored inductors.)
Being a pack rat, I've salvaged a bunch of toroidal cores out of
scrape 360watt SMPS. The cores were originally used as inductors on
the line input section. I've test wound one of these cores with ~8
feet of 20ga wire, and achieved my goal of 0.6mH. Here's a picture of
a bare core and my home made inductor if it helps:
http://lerch.no-ip.com/atm/Ind_Core.jpg (170KB)
At the moment, I am at the decision point of deciding between abiding
by the 'audiophile law' or just using the iron cored inductor.
If it helps, this inductor will be used as part of a Butterworth 3rd
order low pass filter, with a crossover frequency of 3Khz, driving an
8 ohm midrange speaker at no more than 50 watts rms.
Also, I can measure the impediance vs frequency over the audio range,
can I test the iron cored inductor at various amplitudes settings and
get an idea on the likely hood of core saturation becoming a problem?
Thanks in advance,
Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction, Testing, and Coating site)
http://lerch.no-ip.com/ChangFa_Gen (My 15Kw generator project)
Press on: nothing in the world can take the place of perseverance.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent.
Calvin Coolidge