J
James W
Guest
your timing is perfect. Run, don't walk to your nearest magazine stand
and get a copy of the December QST ( ham radio magazine ).. There's an
article for a home built condensor microphone in this issue.
Simple to build. Works great.. Have fun
- jim
ehsjr@bellatlantic.net wrote:
and get a copy of the December QST ( ham radio magazine ).. There's an
article for a home built condensor microphone in this issue.
Simple to build. Works great.. Have fun
- jim
ehsjr@bellatlantic.net wrote:
DaveC wrote:
On Tue, 2 Dec 2003 18:49:07 -0800, Michael A. Terrell wrote
(in message <3FCD4F09.A1EA8E6C@earthlink.net>:
What power level and frequency range?
less than 1A (probably less than half that); 20KHz; 40 KHz; 60 KHz; 80 KHz --
a different inductor for each F (I presume an adjustable one couldn't cover
that entire range...)
Thanks,
--
DaveC
What about a tapped inductor? Would that suit your needs?
It's not adjustable, but the inductance is selectable via
a rotary switch - or by moving an alligator clip. (But you'll
have to change your frequency - see below)
Frequency: - at those low frequencies LC is not your best
choice. To begin with, you would need a MUCH greater
capacitance to make it workable, and even then you'd neet
a LOT of inductance - unless my math is off. I figured a
4,000 uH inductor and a 15,000 pF cap would get you areound
20.5 kHz [It's late, I'm tired, so you 'll have to check
my math: freq = 1/(2*pi*sqrt(LC)) ] Those values are not
practical.
If you can go to 2.0, 4.0, 6.0 and 8.0 mHz instead, then
LC works well.