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#Post#: 1809--------------------------------------------------
LJL SC get hot an blows bulbs?
By: happygolucky Date: March 20, 2014, 10:40 pm
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thank you for sharing... i have enjoyed learning this circuit an
playing with it...i have replicated the air core transformer
circuit many ways an the transistor gets hot now an it fry's...
blows my 1 or 2 ecosmart 6 watt led's>? bad smell bulb is hot
cooked but not the transistor just hot ? the night before i was
using an 11v bad car battery ran great for 6 hours no heat
just warm ,then i put a fresh car battery on tonight 12.2v an
blew the 2 bulb's in house lamps ....same set up as previous
night bulbs got very hot an blew it quickly disconnected the
battery when light flickered... i made one with 22ga an one with
20ga magnet wire 14 an 100 ...an the other 14 an 109 it is
exact duplicate of yours same transistor an diode.... i'm very
puzzled..could you explain why i checked for a short nothing? i
did not use a choke...curiosity is killing me!...is it the
ecosmart bulb? works fine with one GE 13 watt bulb?
#Post#: 1810--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: lynx wind Date: March 21, 2014, 6:35 am
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I haven't been able to replicate this with 20 or 22 awg wire. I
have had good results with 24, 26, 28, 30 awg. It could be the
low resistance of the primary and secondary are out of balance
with the number of turns and/or voltage.
#Post#: 1813--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: sut Date: March 21, 2014, 8:03 am
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@happygolucky that sounds like what mine did about a week ago !
My transistor was running warm all the time and when I let it
run for 4hrs (approx) it took out one of my led(ecosmart bulbs )
and transistor ! I am using radio shack wire, all of the green
wire which is 26 gauge ( package says 75 ')and 14 turns of
copper colored wire (22 gauge) I don't know how many turns of 26
gauge it was but I will check . I was using deep cycle 12.48
volt battery I tend to lean toward what LW said out of balance
on primary and sec. But I have so little knowledge on this! @CG
& @LW are the professionals
Ok I found my trouble ! I only have 74 turns of 26 gauge ( all
of green ) and 13 turns of 22 gauge so mine is way out of
balance I will have to switch to 30 gauge to get 100 turns
#Post#: 1814--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: lynx wind Date: March 21, 2014, 9:33 am
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I have made a lot of the radio shack green wire coils. It's
about 1 foot around a 4" coil so 75 feet=74 turns is right. You
just need to use about 10-12 turns primary. The best ratio I
find is 6.8:1, or 7:1 if you are less precise.
#Post#: 1815--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: sut Date: March 21, 2014, 10:16 am
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Great! so then with 13 turns of 22gauge that would over drive
lamps a little and cause it to heat up the transistor a little
(just warm )
#Post#: 1820--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: lynx wind Date: March 21, 2014, 12:24 pm
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Thank for posting this information and your excellent
replication.
A couple things. I do YouTube videos about what I try and
learn. Maybe I should take old ones down, but I leave them for
people to see my journey.
Here is what I would do.
Delete the diode bridging the Base Emitter.
Add one to two turns of primary around the coil.
We also find that rewiring like this helps as well. See
diagram. Same idea but note direction on where the wires come
off and how the base is connected to one of the LED connections.
#Post#: 1822--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: lynx wind Date: March 21, 2014, 3:28 pm
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Happy@
Wonderful story and background. You and I would get along well.
Here's another thought after studying your photo. I abandoned
the design you are using because the heat sink is too close to
the coil. That aluminum can slow the frequency and leaves the
transistor on too long. Try a smaller heat sink or just delete
it and let us know how it works. I tested a coil once with
aluminum too near and it does cause Transistor heating.
You may be able to bend the aluminum away from the coil.
Its best to make one design change at a time and record results.
#Post#: 1838--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: lynx wind Date: March 22, 2014, 9:05 pm
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Sorry for your blown transistor. I have blown quite a few.
Note that in the diagram a couple posts back the primary and
secondary are wound the same direction. The transistor will
have a wire from emitter to negative battery. And a wire from
Base to LED bulb. The entire coil (primary and secondary) will
have two pairs of wires coming off. One pair coming off in the
same direction will be twisted together and goes to collector.
The other pair coming off together...., hopefully you marked the
primary - it goes to battery positive. The other wire goes to
the LED bulb.
If you want, you can keep the two coils separate and join with
tape when things are wired.
You can also sort things out with a multimeter. The primary
will have very little resistance, the secondary far more.
If you are unsure if you have things wired right, test with a 9
volt battery. If the bulb lights you're good. If it doesn't
check the wiring.
#Post#: 1840--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: happygolucky Date: March 22, 2014, 10:44 pm
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thanks all is good!
cheers :)
#Post#: 1853--------------------------------------------------
Re: LJL SC get hot an blows bulbs?
By: lynx wind Date: March 23, 2014, 5:16 pm
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We're all friends here. Really!
@Happy,
I am serious about the aluminum next to the coil. It really
drives up the power draw. Also, CFLs are a novelty but are hard
on the transistor, especially when mixing bulbs. Try the
circuit without that aluminum piece, you may find the transistor
runs cool. Then you can place a smaller heat sink inside the
circumference of the coil and use something non metal for a
hanger.
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