Author Topic: Joule Thief (Read 6372536 times)

altrez · « **Reply #12810 on:** February 26, 2010, 12:48:47 AM »

Quote from: stprue on February 25, 2010, 09:47:33 PM

One thing I noticed is that the torriod doesnt seem to make that much of a difference. My 3-5-15 works as well as my biggo with way more winds! Lets see how long it lasts!!!

What transistor are you using? Will a 2n2222 work?

-Altrez

altrez · « **Reply #12811 on:** February 26, 2010, 12:50:16 AM »

Quote from: stprue on February 25, 2010, 07:52:11 PM

@Jonny

Your advice!

Thanks...Stew

Nice! are you getting good distance yet?

-Altrez

altrez · « **Reply #12812 on:** February 26, 2010, 12:52:21 AM »

Quote from: jonnydavro on February 25, 2010, 03:45:16 AM

Hi Altrez.When you get a trigger coil,sometimes they will have three pins and sometimes four.Only three pins are used and if you get one with four it is just to help with mounting.
Is all you do is connect a croc lead to a metal bowl or tray and connect the end of the croc lead to one end of the primary coil of the trigger transformer.Do the same with the other end of the primary.
Get another croc lead and attach that to the third pin which is the hv output and feed that into an avramenko plug but the most important thing is to use a good virtual gound on the last leds negative leg.
The idea behind it is the simple sec is acting as a transmitter and to recieve the most energy,both transmitter and reciever have to be tuned to the same frequency and as both transmitting coils and recieving coils are the same,they should be fairly close.
Xee2 may have some ideas on how we can improove on this as he has experience in radio but it is quite a good place to start.Jonny.

Thank you! I can get around two feet with the TDK circuit and small as in about the size of a half dollar receivers.

-Altrez

kooler · « **Reply #12813 on:** February 26, 2010, 01:17:59 AM »

Quote from: stprue on February 25, 2010, 01:29:10 PM

Kooler, that is a very long run for the circuit!! nice job! Could you try something for me....one of the differences I have tried is connecting the + rail of the voltage input to the + of the output/led rail! Not sure if it make a difference but since my versoin is a little different I would like to see what is does. (for me no inducto...yet, mica cap, switching doides on both rails and a not ideal 2N3904 transistor)

the reason i showed the video of it running at 1.5ma is because i figured some might see it if they built this but theres alot of spikes going back to the battery.. put a led on the battery and it will light.. anywhere on this circuit it will give enough power to light a led at 1.5ma..
even the resistor and the cap will light a led with no loss on the input..
thats why i asked xee2 were would the bemf be at.. because were it should be.. it isn't..
its a interesting circuit..

xee2
i put a bridge and cap on the secondarys and it would only charge up to 3.1 volts.. thats with no leds in it..
and the same volts with 4 leds in there..

robbie

xee2 · « **Reply #12814 on:** February 26, 2010, 03:31:44 AM »

@ altrez

The drawing of the simple SEC I posted was not correct. Corrected drawing below. I also tried to build this and it did not work for me. I hope you have better luck.

xee2 · « **Reply #12815 on:** February 26, 2010, 03:40:31 AM »

@ kooler

Quote from: kooler on February 26, 2010, 01:17:59 AM

xee2
i put a bridge and cap on the secondarys and it would only charge up to 3.1 volts.. thats with no leds in it..
and the same volts with 4 leds in there..

Very strange. I have never seen 3 volts light a string of LEDs in series. You must have spikes at a higher voltage. I do not know why you are not seeing them.

altrez · « **Reply #12816 on:** February 26, 2010, 03:45:31 AM »

Quote from: xee2 on February 26, 2010, 03:31:44 AM

@ altrez

The drawing of the simple SEC I posted was not correct. Corrected drawing below. I also tried to build this and it did not work for me. I hope you have better luck.

xee2,

i don't have the 10kv trigger coil so I can not test it. However my TDK is still humming along perfectly. i tried a 4kv trigger coil i had here and it did not work. But the coil could be damaged. I just ordered some more. And will grab a few 10kvs from mouser.

-Altrez

innovation_station · « **Reply #12817 on:** February 26, 2010, 03:54:53 AM »

i just happen to have a

TDK 332P02201 ...

LAYING AROUND...

look good and hard at how it is wound ...

then i may teach you some real magic ...

it is an intresting winding config top coils are trifillar .. bottom pancake single ...

: )

stevie way it ?

i can swing that ..

it can be a compact device... we can always drop it in the shrinker ... : )

xee2 · « **Reply #12818 on:** February 26, 2010, 04:59:33 AM »

@ kooler

Quote from: xee2 on February 26, 2010, 03:40:31 AM

Very strange. I have never seen 3 volts light a string of LEDs in series. You must have spikes at a higher voltage. I do not know why you are not seeing them.

Perhaps the spikes are on for such a small part of each cycle that they never add up to much extra voltage. They must be at a a pretty low rate in order to get the low power consumption. That is my best guess for now.

kooler · « **Reply #12819 on:** February 26, 2010, 05:45:06 AM »

i got me a newer camera coming soon.. so maybe i can get you guys some better scope shots..
i took my portable scope to a guy that has messed with radios for years and he checked it over..
he said it is fairly accurate.. but he said it was very sensitive .. he told me i probably should buy another scope probe to see if that helped ..
i meant to say earlier that if you want to light a led off the battery itself you will need to put a led on the secondary.. it won't pulse the battery till it has a load on the sec.. windings
it goes from 10khz no load to 5.3 khz with how ever many leds i want

robbie

stprue · « **Reply #12820 on:** February 26, 2010, 01:49:12 PM »

Quote from: altrez on February 26, 2010, 12:48:47 AM

What transistor are you using? Will a 2n2222 A?

-Altrez

I'm waiting for my order to come in and it has msp/a transistors but right now I'm using a 2N3904

stprue · « **Reply #12821 on:** February 26, 2010, 01:58:35 PM »

Quote from: stprue on February 25, 2010, 09:47:33 PM

One thing I noticed is that the torriod doesnt seem to make that much of a difference. My 3-5-15 works as well as my biggo with way more winds! Lets see how long it lasts!!!

Well the new BJT did not last the night and I know it was because of the inductor. This morning I took off the inductor and recharged the maxcap. I also took off 1 LED also.

sirmikey1 · « **Reply #12822 on:** February 26, 2010, 02:13:30 PM »

altrez and stprue,

Kooler and another member also recommended these
transistors a few weeks ago...

if you want a jt to run.. on nothing.. use this transistor.. mps2222a
If you can get some BC337-40 transistors I suspect they will work even
better than the mps2222A

M

stprue · « **Reply #12823 on:** February 26, 2010, 02:52:31 PM »

Yes Sm you told me already and I also read it

jonnydavro · « **Reply #12824 on:** February 26, 2010, 06:22:52 PM »

Hi.I discovered a strange modification which significantly reduces the current draw on both my Simple sec exciter and also Slayers exciter and may be worth trying on a joulethief.This is what i did.I added an extra transistor and connected the collector of the new transistor to the base of the original and the base of the new transistor to the originals emmiter and left the new transistors emitter floating.The current draw drops by over half and output is not realy effected.Whats more is you can keep adding transistors like so and the current draw comes down with each addition.If anyone has any thoughts on why this floating transistor is having this effect i would be really interested.
I have also had a think about the wireless transmision aspect of these circuits and come up with an updated simple sec reciever circuit but it works equally well with slayers exciter.
I am getting an led to light at over 2 meters distance.
I also did an experiment with slayers exciter and got it lighting an led on a vinegar battery.
Here is a vid of todays experiments and circuit diagrams of power saving mods and wireless reciever circuit update.Jonny
http://www.youtube.com/watch?v=RZWuRL4Nto8

@electricme.Hi Jim.Thanks for the hello and hope everything is good ai your neck of the woods.Jonny

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Author Topic: Joule Thief (Read 6372536 times)

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