Re: Questions about size of magnetic wire to use

On 20 Oct 2005 14:35:41 -0700, hhc314@xxxxxxxxx wrote:

>Excellent advice!

One do wonder what calculations he's referring to; that would
probably be interesting reading.
>
>Still, I believe it's funny that he was asking originally about
>"magnetic wire", which is something that I haven't seen since the
>1950s... (Magnetic Wire is definitely not the same thing as Magnet
>Wire.)

I've only seen pictures of them.
How was the fidelity? and what ips was the wire traveling at? Was
the wire malleable or stiff?
>
>Early wire recorders sold during the early 50s (including the
>Silvertone that my dad owned from Sears and Webster-Chicago) used
>magnetic wire as their recording medium.
>
>Also, spark and ignition coils (like the Ford Model T spark coils)
>employed many parallel strands of magnetic wire to form their magnetic
>cores.

I came across and antique store around here that has a stock of old
original Model T coils.
>
>I haven't seen any in use since those days, although no doubt it
>remains in use for some unique and rare applications.

I built my induction coil to work as a transformer on 120 VAC and
spark coil on 50 VDC. It was used to excite the Tesla coils I was
working on. As a transformer I could only get ~6-7 KV out and as and
induction coil ~100KV.

I wound one primary on 12 gauge steel wire (stuff used to hang
ceilings with - straight 8' pieces in bundles - cut to 18") and a
second primary with 20 gauge electric fence wire. Almost no
performance difference with the two wire sizes (primary turns the same
, secondary turns the same) Primary is 354 Turns X four layers - can
be switched into parallel and series arrangements. Secondary is
~67,800 turns (resistance came out to within 300 feet of the design
value).

I ran 3 primary windings in series for 120 VAC and all in parallel for
DC operation. Took a week to wind the secondary and about 6 months to
build the whole thing.


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