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  #31 (permalink)  
Old 10-06-2010, 05:26 AM
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Solar joule thief

@SkyWatcher:
I'm going through a similar process. I'm also trying to figure the best way to wire the 1" toroid and also the 3/4" size, to their maximum efficiency for the use in the Solar JT circuits.
Later on I'll also build one big solar JT with many secondaries, each secondary lighting separate multi-Led lights set.
I'm working towards a 12 solar Jt that will light many Leds throughout my house.
Thanks for posting your results. Now that I have been able to post on this forum (after a couple of year of just read-only), I'll be keeping in touch.
NickZ
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  #32 (permalink)  
Old 10-07-2010, 12:58 AM
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Hi NickZ, thanks for your thoughts. I took that 20 led christmas string and took out the leds and put them in parallel on my breadboard to use in the typical JT collector/emitter output position and am getting much better light output, I'm making duration tests now and going to try various coils and toroid sizes, etc. Using the secondary for output is good, though I notice it's much more finicky to get good duration.
peace love light
Tyson
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  #33 (permalink)  
Old 10-07-2010, 06:57 AM
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SkyWatcher:
I just finished another one inch toroid with 25 turns bifilar insulated braded telephone wire (thin insides wires). I left some room between each wire wrap. More tests tomorrow...
I'm glad you're into doing all those coil tests, that is what it takes to get this right.
I'd like to try for at least a 2 inch toroid size, just to be able to get more secondaries wound on it, if I can get my hands on one. I heard that the old Tvs come with one that is about 3 inches? I'll look for one like that also.
NZ
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  #34 (permalink)  
Old 10-07-2010, 07:33 AM
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Hi NickZ, Thanks for sharing what your working on, any pictures. I am still making duration tests, well many tests to be done in fact and these warm white straw hat christmas leds are really spreading the light out nicely, i put the plastic covers and it helps diffuse the light a little more. In the pic are five of them in parallel right now and are burning brighter and lighting up the bathroom better than with the full string of 20 and so far, even though this particular time test is still going it's exceeding the series led test with secondary. Maybe with the proper ratios of coils and led arrangement, a secondary configuration might be just as good, though so far, the normal JT emitter/collector output with leds in parallel is doing a much better job.
peace love light
Tyson


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  #35 (permalink)  
Old 10-07-2010, 06:31 PM
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@Seumas:
I removed the small solar panel from a Casio calculator to use with my Jt circuit. It put outs about 2 volts in full sun, but will not run my JT.
So, I made another 1 inch torroid coil last night which does light up a 7 white Leds bulb with only one 1 1/2 volt battery. I'll try that Jt connected to the solar panel next. It is important for the Jt to be able work on only one battery's voltage (1.5 volts) or less. If it can't, then something needs improving, since the device is not working like it should. My 2 volt panel should be able to charge a single AA 1.5 volt battery, and that should make the Jt work like it should. We'll see. If I can get my newest coil to work on the 2 volt solar panel now, I'll let you know.
Your button cell is probably higher voltage than just one or two volts, probably 3 or 4 volts.
NickZ
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  #36 (permalink)  
Old 10-07-2010, 11:22 PM
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Hi NickZ, thanks for sharing what your doing. That casio calculator solar panel is probably too small, since it is only meant to output very low current compared to say a solar garden light photovoltaic panel. calculators use tiny amounts of current to run. I would at the least, try and get a garden light solar panel. I plan on trying to rewire that 12 led lantern, i showed a pic of, so that all leds are in parallel, since right now they are wired in parallel/series, which doesnt work as well since the normal JT output is lacking in the voltage to run at 6 volts, 3 volts is perfect for regular JT output. Also, my longest test run with any secondary JT configuration with the series christmas led string has been 6.5 hours using the AA 1.2 volt rechargeable and the longest run time so far with the same warm white leds in parallel has been 11.5 hours giving equal or greater light output. I have a test running right now with the same warm white leds using the 1/2" diameter toroid with 24 gauge bifilar and it has already exceeded that time duration. I will be making 24 gauge bifilar tonight and filling a 1" toroid to see the difference compared to the smaller 1/2" toroid. Then I will test the large ferrite bead with 24 gauge to compare duration as well. Then, once I get the best configuration for output and duration, I will make a light design to hold the leds and then build a separate dedicated solar charger using mulitple garden light solar panels to charge multiple AA 1.2volt rechargeables, then try and incorporate some kind of joule thief circuit that will also charge in the moonlight. Though the moonlight charger may have to be a capacitor dump design. We will see.
peace love light
Tyson
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  #37 (permalink)  
Old 10-08-2010, 04:12 AM
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@Seumas, SkyWatcher and All:
I made a new 3/4 inch toroid today, and I was able to get the small 1/2 by 2 inch calculator solar panel to light my Jt directly, even off of the light from a lamp. But this last coil (3/4 inch toroid) made with insulated tinned copper wire, won't light off of only one AA, it needs two. I have another one inch toroid that will light leds from only one AA but will not light from the solar panel. So, interesting results so far. I'll try to send a picture or two tomorrow.
I wonder what a 2" bifilar air core would do on the Jt. I'll try that as soon as I get more wire. I made a coil using a thin 2 inch round magnet, similar to the kind used in speakers, but did not get good results, maybe due to poor permeability.
Since I can't obtain any 2 or 3 inch toroids. I'll have to look for an old monitor or crt Tv. to pull one out of.
I also have another Jt that is lighting one Led or more, from two AAs batteries, while it's also charging two more AAs. The 4 batteries are needing to be swapped back and forth several times a day to keep all of them all charged up and lighting the leds, but it has been lighting and charging very well, untill the batteries finally gave out after a couple of weeks. I was using regular non rechargeable batteries, which are all I can get here.
I have not had any luck with secondaries yet, I think it's that there is not enough inductance from my coils yet, but I'll get to that soon.
I love the way my newest Jt lights up from the tiny solar panel, with no batteries. I'll try hooking up a charge capacitor to it soon to see what it will do. It would be nice if it can charge during the day from sunlight next to a window , then light the Leds all night long.
Good luck with your tests...
NickZ
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  #38 (permalink)  
Old 10-08-2010, 08:40 AM
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Hi folks, Hi NickZ, glad that calculator panel will have some use for you, will be interesting to see if it can charge something. The one test finished with the 1/2" toroid w/ 24 gauge JTC and the 6 christmas leds, It ran for 14.5 hours, though I think I can stretch that to 16 hours or so with a few tweaks. I also made a JTC with the 1" toroid using 24 gauge and the frequency was too low as I could hear the annoying high pitched sound, so that will not do, and if I put thicker gauge wire on it as shown in the original version of my lantern, the run time was only 4 hours. So it seems more tests need to be done to try and get the larger toroids to perform better and not be audible, which I'm not sure is possible till I try some different things. Though so far, the best combination for a fairly usable light with good duration, is the 1/2" toroid with 24 gauge bifilar which is now running the modified lantern w/ the 1 AA rechargeable. Maybe the compromise would be if one wanted more light, would be to use multiple smaller toroids to maintain the higher frequency which gives better efficiency and run them all off the same AA of course with each toroid having its own transistor. Here is a pic of the lantern modified again with 6 of those warm white christmas leds in parallel. I used one of those plastic connector strips to mount the leds and replace the other unit that slid inside the plastic tube diffuser.
peace love light
Tyson


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  #39 (permalink)  
Old 10-08-2010, 04:53 PM
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SkyW and All:
I think that it's important that any of the toroid coils and wire combinations are able to light off of a single AA, if not we're just pissing in the wind.
I think that with the right solar panel and the right JT circuits ,a solar panel can run many JTs circuits, at night and recharge itself (capacitors) during the day. That is what I'm working towards, for now.
My tiny 2 volt solar panel is charging a capacitor now. So far it is all working like it should on about 1 1/2 volts and can even go down to less than 1/2 volt and the Led is still on, even with 7 leds (dim).
More tests will be done on it today to see how long it will last at night just from the charge in the capacitor.
Although I don't have super caps, I do have a handfull of capacitors that come out of Pc power supplies, etz... Maybe someone can recommend which mF and voltage caps can be used best. I feel like soldering all the caps together to see what they'll charge to. No, Yes?
Your tests on the lantern are looking real promising. Check the link to the warm whites leds from Ebay, (below).
I have a 16 light Led Emergency Back-up light that I'll be doing something similar with, also. It charges a capacitor and last about 3 hours now as is, but hopefull I can install a Jt into the circuit and make it last a whole night, running off the capacitor that it has. It recharges the cap back, off of the grid.

Check out these warm white 140degree Leds:
20 PC 0.5 Watt StrawHat 8mm 140° WARM White LED 90Kmcd - eBay (item 250448852092 end time Oct-13-10 16:47:29 PDT)
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  #40 (permalink)  
Old 10-08-2010, 11:09 PM
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Hi NickZ, thanks for the info. on your calculator panel tests, sounds good so far. That link you posted to those warm white higher output leds looks good, though a little pricey compared to the 3 bucks for 20 christmas led string. Oh, i forget to mention that the lantern I modified twice now, had a resistor stuffed inside that square tube led assembly for each led, so there was 12 resistors each 540 ohms that were limiting the light output of the lantern, since now without all those resistors and the new leds, it is twice the brightness for around the same duration, still testing that particular circuit in the lantern right now. Going to try and get the frequency higher on the 1" toroid, so that it might be usable without the noise.
peace love light
Tyson
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  #41 (permalink)  
Old 10-09-2010, 12:39 AM
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Solar joule thief

@SkyW:
The 0.5 watt bulbs are more expensive buy, but in an effort to light ones house, they can be built into any 20 (or more) empty Led Panels, and alot of light can can be obtained. There are already many different multi Led light bulbs being made now, ready to go.
I was also thinking how a combination of different color Leds can be placed into the ready made empty printed circuit panels, and the desired color factor is able to be obtained. As I still don't particularly like the light emited by regular white Leds, but it is much more acceptable when the lights are dimmed down, or inside of lamps. I have not seen the warm whites leds here yet.
Thanks for the pics of the lantern, looks like a nicer color tone Led (straw hat) I'll send one of the tiny solar Jt that I just made, just let me know WHERE to attach the picture. I can't find that.
I also can't find a spelling checker, if there is any.
NZ
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  #42 (permalink)  
Old 10-09-2010, 07:13 AM
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Hi folks, Hi nick, theres different ways to post pics, one is use energeticforums attachments feature which has a paperclip by it, or use an image hosting site like what i use, image shack. Yes those leds your looking at are probably much brighter, if your looking to replace something like 40 or 60 watt regular light bulbs, though even the 20 led string i showed in the pic isn't too bad. I bundled one of the led strings into a cluster and mounted it into a cfl base and installed in light socket and I'd say it's equivalent to a 15 to 20 watt incandescent bulb, while this led string draws around 2.4 watts. That last test with the 6 warm white leds in parallel finished, it's about the same maximum I had using the other leds, about 17 hours of light good enough to do all the normal things in a bathroom except maybe put on makeup for women. Though the output could be raised or use multiple toroids with more leds in parallel and it would be even better. The lantern I modified has to be doing better than most low light lanterns as far as output and run time. I have a few luxeon flashlights that I'm curious how well this JT circuit can run them.
peace love light
Tyson
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  #43 (permalink)  
Old 10-09-2010, 01:39 PM
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SkyW:
Here is a picture of my little solar panel lighting the Led bulb. It can charge capacitors also, I imagine a battery or two also, I'll soon know more
NZ

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  #44 (permalink)  
Old 10-10-2010, 12:11 AM
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Hi Nick, thanks for the pic, I like visuals. That's a nice bumblebee wire color scheme, though are you sure that's a ferrite toroid, looks good though. I am rewinding one of my 1" ferrite toroids like the gadgetmall layout to run a 1watt led and see what I can charge or run on the regular JT output.
peace love light
Tyson


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  #45 (permalink)  
Old 10-10-2010, 03:42 AM
Jenn Meredith Jenn Meredith is offline
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Does anyone know about private solar rebates?

Hi everyone,

I am thinking about getting solar power for my home in New Jersey. I was originally thinking about doing a state rebate, which would be about $5,000 off. I also saw this thing in the news about this solar company doing a $6,000 rebate, but it is a private rebate that is not involved with the state government.

GeoPeak Energy Launches NJ Solar Rebate Program for New Jersey Homeowners

On other instances, I also heard about this rebate from Renewable Energy World--http://www.renewableenergyworld.com/rea/news/article/2010/09/cant-get-solar-rebates-create-your-own-

Have any of you gotten any of these private rebates? Do you really get your money back, and when will you get it? Are there any other companies in New Jersey that are giving these rebates?

Thanks,
Jenn
Home Solar Power Kits
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  #46 (permalink)  
Old 10-10-2010, 04:32 AM
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@SW:
That looks like a great little circuit. Is that 11 turns bifilar and 22 secondary? With a one watt Led bulb? The straw hat warm white bulbs do come in one watt size I think, or use two of the 0.5 watt bulbs.
I'll give that circuit a try also. I have a couple one inch ferrite toroids and some 2n2222As transistors that would work for that. I do need to get some more magnet wire though. Any ways, let us know how it goes.
My tiny solar panel with the bumble bee Jt did charge a 10v 4700 mf capacitor to 3 volts today, and it will keep the led on without any light going to the solar panel, but for only a couple of minutes. It's a start. But I'll try to charge an dead AA battery tomorrow instead to see what happens.
I've been having real good luck charging batteries while lighting an Led with my other 4 AA Jt. (also with a one inch toroid) by swapping batteries back on and forth. It does charges great, but I do have to swap them every 6 hours or so. Still it's about as close to free energy as I've seen yet. I'll put in a switch on it soon, so I can swap the batteries by just flipping a switch. I'll send some more pictures.
I also made a couple different two inch air core toroids today, that I'm still working on.
Thanks for posting the sketch above, looks like it's worth replicating.
NZ
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  #47 (permalink)  
Old 10-10-2010, 05:23 AM
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Hi folks, Hi Jenn Meredith, I haven't researched that much into home solar power plants because at the cost even with rebates is out of the question at this time. Though we all make choices, albeit the choices have been very limited due to a handful of power crazed embodied souls and their methods of dumbing down people has been very effective till lately, though my view is if one takes advantage of this benefit(rebate) I can't help imagine that somehow by doing so, you will forfeit your rights to do as you please with your solar power system. I hope I'm wrong, however it smells of corruption to me.
Hi Nick, I actually made an air core toroid also, going to test it soon. I built that gadgetmall circuit 1.2volt AA, though I do not have an ultracap(boostcap), nor do i have a decent nichrome heater element, but i do have a few large car audio 1.5 farad super capacitors. I used a 1" ferrite toroid with 12 turns - 24 gauge bifilar and 24 turns of 24 gauge secondary and used a 1 watt luxeon led connected to secondary output, then hooked the 1.5 farad supercap to the regular collector/emitter output with diode, also using tip42c with 1kohm base resistor because it seems to run the circuit better. I powered up the circuit and initially the cap was about .4volts and it slowly charged the cap, while the led was not lighting and then once the cap was above the battery voltage the luxeon led started to get brighter and brighter until it reached it's full output for the settings the circuit is at right now, I'd say it's 70% of full brightness. Cap rose so far to 2.8 volts and is still climbing slowly, one thing i notice is that no matter if the cap is hooked up or not it doesn't change the brightness level of the led, so it seems that once the 1.5 AA's voltage is exceeded by the cap that any load removed from the cap after that point will have no affect on the input or the output of secondary, which in this case now is the luxeon led. More testing to be done.
peace love light
Tyson
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  #48 (permalink)  
Old 10-11-2010, 03:41 AM
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SW:
Your last build sounds great. So, you are able to light the one watt Led bulb with the secondary, to 3/4 brightness, while charging the cap at the same time.
I am charging two new AAs that are now discharged, but I'm charging them back up with the pulses from Solar Bumble Bee Jt. I can charge a cap to 3 volts using only the tiny solor panel, but since the light from the cap only lasts about a minute running the Led, I'm using the two AAs now to see how they will charge up, and how long the charge will last.
I recovered a 3.7 volt rechargeable phone battery that was totally dead, and would not take a charge, by a 1 hour charge by a Jt. The phone is still working two weeks later. It is now charging fine on the regular phone charger. Minor miracles do happen.
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  #49 (permalink)  
Old 10-11-2010, 06:15 AM
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Hi folks, Hi Nick, thanks for sharing your experiment results, yes i built the gadgetmall circuit and it does work like he says, though I'm having good results right now with a different setup charging a 1.2 volt AA rechargeable while using the typical 1.2volt AA rechargeable for the input. I switched toroids to the 1/2" diameter and 24 gauge bifilar which is giving much better light output that hurts to look at and charging of the AA which is right after the leds on the regular JT output. Here is the simple circuit.
peace love light
Tyson


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  #50 (permalink)  
Old 10-12-2010, 12:27 AM
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Hi folks, I used the circuit I just posted previously and found that while it charged the secondary AA cell and it held a voltage about 3 times what the primary battery lost and when swapped it ran the circuit, however it was not as solid a charge, some what fluffy. So I'm testing right now this modification to the circuit, a super capacitor in parallel with the secondary charge battery, though an ultracap(boostcap) might even be more ideal, also the capacitor is in line with the led diodes, then i put the AA cell in parallel off of that in hopes that it will attain a more solid charge. With this setup, it is charging the battery well, so we will see if it charges better this way. Here is a cad pic of the circuit addition.
peace love light
Tyson


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  #51 (permalink)  
Old 10-12-2010, 02:53 AM
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SW:
I'm also playing around with different capacitors to see what's what. They do seam to be able to slightly boast the charging volts of the Jt by a volt or two.
Nice idea combining the cap and the battery, that's what I'm doing now, also.
NZ
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  #52 (permalink)  
Old 10-12-2010, 06:57 AM
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Hi Nick, thanks for your thoughts. I'm trying to figure out a way to get as close to the same charge return in a secondary charge battery. Problem is, if we can't get an equivalent solid charge back that isn't fluffy, then it's not that useful. Though i think there is a way and gadgetmall using that ultracap that is part capacitor/battery seems to do it well, that's why I figured trying a capacitor in parallel.
peace love light
Tyson
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  #53 (permalink)  
Old 10-12-2010, 05:03 PM
Watson Watson is offline
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Quote:
Originally Posted by NickZ View Post
SkyW and All:
I think that it's important that any of the toroid coils and wire combinations are able to light off of a single AA, if not we're just pissing in the wind.
I think that with the right solar panel and the right JT circuits ,a solar panel can run many JTs circuits, at night and recharge itself (capacitors) during the day. That is what I'm working towards, for now.
My tiny 2 volt solar panel is charging a capacitor now. So far it is all working like it should on about 1 1/2 volts and can even go down to less than 1/2 volt and the Led is still on, even with 7 leds (dim).
More tests will be done on it today to see how long it will last at night just from the charge in the capacitor.
Although I don't have super caps, I do have a handfull of capacitors that come out of Pc power supplies, etz... Maybe someone can recommend which mF and voltage caps can be used best. I feel like soldering all the caps together to see what they'll charge to. No, Yes?
Your tests on the lantern are looking real promising. Check the link to the warm whites leds from Ebay, (below).
I have a 16 light Led Emergency Back-up light that I'll be doing something similar with, also. It charges a capacitor and last about 3 hours now as is, but hopefull I can install a Jt into the circuit and make it last a whole night, running off the capacitor that it has. It recharges the cap back, off of the grid.

Check out these warm white 140degree Leds:
20 PC 0.5 Watt StrawHat 8mm 140° WARM White LED 90Kmcd - eBay (item 250448852092 end time Oct-13-10 16:47:29 PDT)
For storage capacitors, you need multiple Farads. Using a bunch of 1000 microfarad caps is not enough, they will only run a JT for a fraction of a minute. I got some 10F (not uF!) supercapacitors from Sparkfun.com. i also bought some 50F supercaps from Mouser.com, but they were back ordered for more than a month. Most supercaps are rated at around 2.5 volts.

For solar cells, I got some from Solar Cell. It looks like the 2V circular cells were for a garden light.

I have a lot of info on Joule Thiefs in my blogs.
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  #54 (permalink)  
Old 10-12-2010, 05:21 PM
Matthew Jones Matthew Jones is offline
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Them Futurlec Solar cells are way to expensive with shipping. Your talking 9 -12 dollars a watt.
You buy B grade cells on ebay for 10% of what they cost there. You might have to build your own little case or something but....

Futurlec liable to make you wait a month or better before you get anything out of them. They have terrible delays and real poor service.

Matt
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  #55 (permalink)  
Old 10-12-2010, 07:59 PM
Guruji Guruji is offline
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JT

Hi guys Gadgetmall had a nice circuit to this lighting leds and charging at the same time.
Attached Images
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  #56 (permalink)  
Old 10-13-2010, 03:23 AM
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NickZ NickZ is offline
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Guys:
Thanks for all your replies. I just charged the new rechargeable wireless phone batteries most of the day in the sun using my tiny solar panel connected to a Jt, but although the battery did take a 2 volts charge, the Leds are still dim. I charged the same new 3.7v phone battery 30 minutes on the regular phones charger, and it lit my Jts Leds 100%.
I think that these 3.7v rechageable phone batteries will work just fine with the Jtc.
Now I just need to get a better solar panel. Thanks for all your suggestions.
It does seam like Ebay's source for grade B solar panels 3"by6" 36 piece set for $55 is a deal. 18 volts total voltage for charging a 12 volt battery.
That would light many 12 volt Jtc, and several hundred Leds... Might not save the world, but it would light my bathroom, and my Christmas tree, ha ha...
NickZ
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  #57 (permalink)  
Old 10-13-2010, 06:53 AM
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NickZ NickZ is offline
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SkyWatcher, Watson, and All:
I find that if I charge TWO AA batteries by using another set of two AA run batteries from a Jt. And, I return the negative rail of the transistor to the battery positive, instead of to the negative side. It works great, and charges strong (no fluff), until the batteries finally starts to lose their charge. But even when the volt meter say 0, I'm still lighting Leds. At that point a joule bump (solar recharge) is in order. Then it all works fine again, runs strong and cool, no fluff.
It appears that it is very important to keep the input voltage steady, and not alow it to get to low, or the benefits of having the Jt in the circuit are lost.
Watson- thanks for the info on the caps.
They look nice, and I'm sure they have their place.
I think that maybe the best bet still are the sealed lead-acid batteries, for now. Please correct me if I'm wrong.
What I'm hoping to build is a 12 volt Solar Jt that uses a Run Capacitor to start and run itself (for hours at night if needed). And also to be able to charge lead-acid batteries, while providing some usable light for the home. At the same time also feeding-back some output to the run capacitor, thus eventually not needing the solar panels addition input. So it's self running and charging while lighting Leds.
NZ
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  #58 (permalink)  
Old 10-13-2010, 09:58 PM
Lighting Up Hope Lighting Up Hope is offline
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Thumbs up WORLD LIGHT Delivering Brightness, Lighting Up Hope.

WORLD LIGHT Delivering Brightness, Lighting Up Hope.

Our Mission
Enable households without reliable electricity to attain the same quality of life as those with electricity. We will begin by replacing every kerosene lantern with clean, safe and bright light. Product should be SOLAR, LED LAMP, LED LANTERNS, Wind-Up (Dynamo) and SOLAR CHARGE.

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suntransfer - ST 2
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Greenlight Planet Inc - Introducing the Sun King solar lantern

We can custom-designed for urban and rural households in developing countries that do not have regular access to electricity and are currently relying primarily on dim, polluting and hazardous kerosene lanterns for lighting it will be providing tens of thousands of solar lighting products for earthquake relief efforts to the devastated areas, most of which still do not have access to electricity and must rely solely on generators and solar power.

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Andi
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  #59 (permalink)  
Old 10-15-2010, 03:11 PM
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SkyWatcher SkyWatcher is offline
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Hi folks, Hi lighting up hope, I would say that this site and the other one has all the ideas one needs to build things to help people, though it should be dirt cheap and no profit made from such an endeavor.
Hi Nick, funny you bring up using 12 volts. I've never had much luck with the JT circuits running 12 volts due to heat in transistor, though I have had good results from the bedini style oscillator circuit, which is just a couple changes to the JT circuit. In fact, just today I was trying to pump up the brightness of a couple new toroids and beads I just wound and have to use 2 AA's to get the brightness I'm looking for and the JT circuit pnp tip42 was getting hot. So I decided to wire it up bedini style and there is no heat at all now and the 12 warm white led's in parallel are burning spots in my eyes if I look at them too long. I will be doing a duration test later to see how this compares with the JT style oscillator. Another thing which I know jeanna and others mentioned, was the fact that the leds do not get warm when powered this way, though just today I ran my 20 led string off the wall power and they did get warm . So it seems there is even more benefit to running led lights this way, it means they should last a whole lot longer than even what they are rated for, since I'm sure they take the heat into account to base their rated hours on.
peace love light
Tyson
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  #60 (permalink)  
Old 10-16-2010, 01:46 AM
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NickZ NickZ is offline
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SW:
The warm white Leds, or regular clear 12 volt bulb (like the car bulbs) give the kind of like that I can put up with. So, a 12 volt joule thief (or several of them) that can light 500 to 1000 leds, would probably do. As I wouldn't be too happy having to use the light from the CFL bulbs. I am looking for practical uses for the Jt, and not just to see how long I can light a single bulb or two, but to see how long I can make alot of them last at least 6 hours if not all night long.
With a 12 volt solar panel keeping the input voltages steady, connected to a 12 volt battery, several 12 volt Jt circuits should should be able to light up many Led bulbs, all night long, and recharge during the day. That is what I am working on.
I am already using the light from a 16 led Emergency Back-up light that is giving me now 5 hours of light each night, and recharging itself off the grid during the day.
But the trick is to make the devices self run without external input.
NickZ
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