Joule Thief

[innovation_station]

love the design ...

bros

yes it will start from a swipe of a magnet .... 

we can do this .... 

ist!

[jeanna]

lots of timeouts this morning...

@Jeanna

My AC voltage with this biggo is like 47v, I'm not sure if it's my set up or the way I wound it or maybe we have stumbled upon another benifit of the MK design! Hummm

My DMM right now says my secondary is 99VAC
An analog meter I recently got says around 450acv which it is. The sweephand and meter is way too small for useful reading, but the confirmation is nice to have.

It would be helpful if you could remove the battery and read the ohm value on the pot. It will be different for different people and transistors, but with the same toroid core, I got the best results of 450vac as seen on the scope, with 60-90 ohm. I am also trying to find just the right stationary resistor so I can build this into something.

xee gave me a link to an electronics store (help xee!) that happens to have a better version of my scope for the same or less than I paid for mine. (I paid $185.00 from allelectronics, but they were out of stock last I looked...)

Thanks for the infos,

jeanna

[jeanna]

@Jeanna:
   It is a known fact that a cold FL tube is harder to light than a warm one. One place I worked, we had to switch lighting so we could see in the winter just because of that.

thay

oooo coold place to work.

Thank you for this confirmation, thay.
I know I have one cfl that will only light on winter mornings if I wrap my hand around it to warm it.

So, it may be the only thing that is slowing things down here in the maritime west coast, where a Turtle-neck shirt is the morning uniform even on days that end up in the 80's.

I also have very high humidity here, esp in winter. It is kind of opposite everyone else inland and to the east.

So, if we are not heating our tubes and we are using high volts/freq to get them going maybe I need more than everyone else just to overcome the coolth and moisture levels here...

thank you,

jeanna

[innovation_station]

OOOPIE ... DUBBLE POST

[stprue]

lots of timeouts this morning...
My DMM right now says my secondary is 99VAC
An analog meter I recently got says around 450acv which it is. The sweephand and meter is way too small for useful reading, but the confirmation is nice to have.

So an analog scope shows 450 and a DDM shows 99? I'm very confused by this!

xee gave me a link to an electronics store (help xee!) that happens to have a better version of my scope for the same or less than I paid for mine. (I paid $185.00 from allelectronics, but they were out of stock last I looked...)

Thanks for the infos,

jeanna
[/quote]

I really want to get one