Joule Thief

[innovation_station]

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

i was hopeing for some thing with out chips only a cap and transistor tiny .....just to start and stop the flow in line at a slow rate .. but easly adjustable by changeing the cap

ist

just like a 12 v dc flasher ...  but for 1.5 v   without a relay

this one showen will work for a much scaled up unit ....  and i could just change the cap ...   but i dont want to BLOW THINGS UP RIGHT NOW ....  SO I WILL STICK WITH REAL LOW VOLTAGE AND REALLY SIMPLE ....

[electricme]

@Bill

Thank you Bill for starting the topic, and congrats to everyone 800 is prity agood innings.
I have learnt so much from it.

jim

@Innovation_station,

Using indicator flasher units.

i was hopeing for some thing with out chips only a cap and transistor tiny .....just to start and stop the flow in line at a slow rate .. but easly adjustable by changeing the cap

ist

just like a 12 v dc flasher ...  but for 1.5 v   without a relay

this one showen will work for a much scaled up unit ....  and i could just change the cap ...   but i dont want to BLOW THINGS UP RIGHT NOW ....  SO I WILL STICK WITH REAL LOW VOLTAGE AND REALLY SIMPLE ....

These things are designed to run at 12v DC (although there are 24v units also), the old style used a bimetal heat plate to flash, it relied on two 21watt bulbs to set the speed of the flash rate.

That said, the newer ones went electronic, the flash rate could be varied by swapping the resistor for a pot, and put different value caps.
Now how would I know that, we are not supposed to tamper with them lol.

jim

[Thaelin]

Pirate:
   I did a couple of hours rummaging through the different threads here and it looks like you hold the trophy for the longest thread ever. At the rate it is going it looks like you will hit the 1000 page mark too. Is there a prize for an over unity thread any one??



thay

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

[xee2]

@ jeanna

I am thinking of trying one in a jtc of course, ...

I think Thaelin answered your question. But would not be good for JT. They are a filament bulb that are brighter because they are at much higher temperatures than normal bulbs. To get high temperature they need high current. That means high battery drain. You might try xeon flashlight bulbs. But you will still have high battery drain problem.

[jeanna]

Thanks Thaelin, Wilby and xee2,

I thought halogens were not a filament lamp. I thought they were a gas I guess because of the name.

The last time I tried a flashlight bulb it did nothing. I think that may have been around 120 volts. I could try something higher voltage now to see.

Probably my best approach will be to get into the diffuser part of this and make a really bright but not blinding light with leds, because if I can do that, I will have much more light for the battery. The spotlight quality of the led is something that I think needs proper diffusion for it to be able to take the place of a tube or cfl.

I'm tired.

night all,

jeanna