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#Post#: 27--------------------------------------------------
Big LJL Aircore
By: admin Date: March 22, 2013, 7:48 am
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Here is a picture of the big LJL Aircore Transformer inspired by
the SJR3.0. It is going to El Paso TX for the RV Show there in
April. It is 26" long and 4.5" D. I have had it running 16
bulbs on 4 amps and the transistors don't get warm. It has an
on/off switch, Hi/Lo switch and a 10 amp fuse.
There are 880 secondary turns of 18 awg magnet wire, and 120
turns of 10 awg wire. Two 2N3055 transistors are in parallel
with a 1 Ohm resistor across the Bases to balance the frequency.
On high all three secondary windings are used. On Lo two
secondary windings are used. The low setting is enough to work,
read and feel comfortable. The high setting is blazing bright.
The design is sort of "steam punk". It can be wall mounted or
laid next to the 12 volt battery.
[attachment deleted by admin]
#Post#: 1322--------------------------------------------------
Re: Big LJL Aircore
By: Rooth Date: January 23, 2014, 3:45 am
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Hello! We show and your new project ?
#Post#: 2055--------------------------------------------------
Re: Big LJL Aircore
By: JonBruno Date: April 2, 2014, 11:13 am
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I was trying to run the numbers to see what I'd need if I was to
build one.
I have a question about the secondary windings...
You used 18 awg mag wire but when I run the numbers on a 26"
core I come up with only enough room for 622 wraps of 18 awg
(.0418)
even at it's nominal bare wire diameter (.0403) I can still only
see that 645 wraps would be possible..
However if you used 21 awg that would more likely jive as it
comes in at 849 wraps at .0306 maximum outside diameter and 869
@ .0299 min (closer but still not 880)
I'm not sure if my problem is my awg chart is wrong or if you
have a longer tube or does the coil just double back on itself?
ORRRR is your 880 wraps the total of all three individual
secondaries?
I'm definitely missing something here... but I'd like to
experiment.
Thanks for putting up with my babbling.
#Post#: 2056--------------------------------------------------
Re: Big LJL Aircore
By: lynx wind Date: April 2, 2014, 1:40 pm
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I no longer have the Big LJL. I am pretty sure it was all three
windings add up to the total. If I were to do it again, I would
shorten the PVC a bit to calm down the ratio to closer to 6.8:1.
That big LJL was close to over driving bulbs. It would light
up several bulbs off a 9 volt battery blazing bright.
You have the right idea. I measure how many turns I can get per
inch with a awg wire. Then I measure how many turns of primary
I get. Then I adjust the length of the PVC until the ratio is
about right. There is something special that happens with the
several layers of parallel wound secondary. Much more work but
really good performance from an aircore.
#Post#: 2168--------------------------------------------------
Re: Big LJL Aircore
By: JonBruno Date: April 8, 2014, 1:01 pm
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Ahh, Like the LJL-SC 100 / 14.7
one question arises, if I was to upgrade the wraps to 200/29.4
what gains would be achieved if any?
What would be different? i.e. amp draw, oscillating freq?
If at 12V at 6.8:1 does it test at the secondary as 81.6v?
I get the correlation of the ratio between the pri and sec.. but
I'm not sure what determines the number of wraps you choose to
go with?
I guess awg may play a role? maybe amperage? space constraints?
This is where my education in transformers 101 is lacking..
#Post#: 2170--------------------------------------------------
Re: Big LJL Aircore
By: lynx wind Date: April 8, 2014, 1:53 pm
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Jon,
My theory with the Big LJL was that by using heavier wire and
two transistors I could power more bulbs. Didn't really see any
difference up to 12 bulbs at which point I didn't have more
bulbs. I think the reason it was so blinding bright is that I
had a pretty "hot" coil ratio, not because it was big.
I think the 4" coil works very well, but you will have to
experiment and wind neatly. Then tune to your liking by adding
or subtracting primary turns.
The reason I use 100:14 is so I can stuff all that wire in a
$2.49 ferrite choke.
Honestly, go to Radio Shack and buy their magnet wire pack for
$7.89, a transistor (or two), a ferrite choke. Wind the entire
spool of green wire around a plastic butter container. Then
wind the 22 wag on with 11 turns, come out with a loop and then
wind on another 7 turns. The loop will be the positive
connection for high, and the longer end will be positive for
dim.
Use a center off SPDT switch. Run the positive to the center
and the loop to one connection and the longer end to the other
connection. Now you have center off, up for HI, down for Lo.
You will find that this will light many bulbs.
#Post#: 2176--------------------------------------------------
Re: Big LJL Aircore
By: JonBruno Date: April 8, 2014, 8:09 pm
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Thanks for the info.
I had some wire left over from an old bedini generator project I
had build a few years ago.
I wrapped the old 68/10 coil because of the limited mag wire I
had.
It lit up nice and bright on a 12v ryobi battery from my drill.
Here I tried to fire two bulbs on a 9v. I just love the novelty
of running 110v stuff on little power sources.
Lots have changed since the old Fuji days.
And the CVS stopped giving away the camera shells anyway.
http://i883.photobucket.com/albums/ac39/sigmaz/Mobile%20Uploads/2014-04/2014040…
I'll get some more supplies tomorrow and try your suggestions.
Thanks again!
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