Joule Thief

[innovation_station]

this is what i found so far ...


hummmm

1hz

http://www.discovercircuits.com/DJ-Circuits/3na-osc.htm

getting better here is 12 -13 peeks.....   all i did was change the transistor ...  2n5871

now ill just use the 1$ flasher from ramma for my switches ..  for the second freq ........

[stprue]

looks verry nice stpure ..    but that is to be expected ...  lol

now cuz i am the villliage idiot lol   can some one help me with a super simple transistor  pulser with a cap that fils and drains ...  and cauzes the timeing of the transistor to switch ... 

if ya know what i mean ...   


i want to use a small transistor to pulse slowly and i in reward for this will teach you some thing you will like ...

ist

as well your design will be used with mine ... 

this is pnp switching on my 2 10 640 1"   now    look at how i tuned it ....it is not tuned to ac sine waves   it is not tuned to highest peek voltage ....  it is TUNNED TO THE most RIPPLES AFTER THE WAVE...   WITH A 1K POT  and this coil i can only tune in to 3 peeks .....  ok   




just cuz a single pules kick is getting OLD  and BORINGGGGGGGG... 

take a look at these scope shots .....

Well a simple solution would be to use a 555ic set to pulse slowly, use POTs to adjust to whatever rate you want!  I kinda sounds like you might be doing this but I'm not sure so... well...just in case here!!!

Stew

[WilbyInebriated]

Thanks Thaelin and wilby,[

quote author=WilbyInebriated link=topic=6123.msg190053#msg190053 date=1247015982]
@jeanna
you can get 12V halogen lamps in the auto section ..

Right, but will they blow with more?
...or is there a resistor for the 12 volt?
I am thinking of trying one in a jtc of course, but there would be no learning if I just popped the bulb at the first shot, you know like about 24 of the leds in my trash bucket.  ... so I am asking first. I will try, I guess. My son had one he liked for reading which was low wattage, but I suspect the high pitched hum was a ringing coil of some sort...

thank you,

jeanna

I need to go to a birthday party so bye for now. I will check back at 9 or 10 PST...

you can run a lot of voltage/little amperage into them without worry of blowing. but you will be lucky to get the slightest glow on the resistive filament without amps. give it a go though, try the jtc, or the fugi, anything you got. it's a good experiment. pull one (a lamp) from the car headlight if you can.

[Pirate88179]

@ All:

I see that my friend Wilby has just posted the 8,000th post here on our topic.  Congratulations everyone on a great topic and I want to thank everyone for their hard work and experiments here.  I still believe we are setting a great example for others on forums all over the world by the way we all conduct ourselves here.

Thanks once again to all of you that have taught me so much.  It is a debt that I cannot repay.

Thank you to everyone.

Bill

[Pirate88179]

Can anyone of you electronics guys answer a question for me concerning the Joule Thief? OK my question is this:
The plans I have call for a 1k resistor.  From everything I have learned in electronics thus far, resistors limit the flow and dissipate overage as heat.  This seems wasteful to me since the idea of this device is to improve efficiency, as in use all or most of the available energy in a battery or similar system.  I am wondering why the resistor is needed?  If it gets "warm" at all it is wasting power correct?  Is this required to protect the transistor?

I would really appreciate any input here as this is my first Joule Thief.  I know they have been around a while and I have a pretty good idea on how they work, at least in relation to the lighting of LEDs.  I am also going to experiment with these using supercaps as the power source both with, and without batteries.  This will all be tied into my work with earth batteries from which I can already light an LED.

If I need the resistor to protect the transistor, then fine, that's the way it is.  It just seems a little counter intuitive from my limited electronics knowledge at this point.  Thank you.

Bill

OK, so I am feeling a little nostalgic tonight.  This was my very first post here opening up our topic.  Just think of how far we have come since this first post.

I have had a lot of folks thanking me for starting this topic but, it is not me, it is all of you that have made it what it is.

Thanks once again to everyone!!!

Bill