Joule Thief

[Mk1]

@jeanna

I made a new mk , with one pick up coil going one way and the other both , and both pickup coil light the led both ways so the secondary both way doesn't make it happen but the jt coil at 180. The mk was never design for a 3 inch toroid , it was design to make the most of the 1 inch toroid, but now tell me ca you put a coil at the 180 form the jt coil , and check if voltage is similar or not , or even more fun you could but a second jt circuit on at 180.

Mark

[jeanna]

Hi Mark I will get to that in a minute.

@xee,
This is what I can say about the comparison of stprue's and mine.

Quoted text is from stprue

Here is my most recent achievement.  Please feel free to replicate if you wish  but keep in mind I'm sure I can get the performance to go up.

PARTS
1 Biggo Ferrite Toroid from all electronics ...
1 2N3055 transistor from RS
1 1000v bridge rectifier

===
no rectifier
===

1 400v metalized cap at I believe .01pF
3 2.5v 10F supercaps from maxwell

===
I should remember to fix my mistake with the battery rail caps.
I put 2 47uF caps in series thinking I was adding more farads, but they should have been in parallel. I forgot to fix that again this morning.
tomorrow is a new day!
---

1 POT I think mine is a 1K but it might be more.

===
The base resistor is ~90ohm
Tuning the pot got the pickup volts up from 80v to 450v.
===

3 Base turns
15 Collector turns
both with 30 gauge mag wire from RS

===

13Base turns
3 collector turns.
24 gauge tele wire
mine would not even turn ON until I had more than 8 on the base, and when I reversed the 3T, for the 13T It started to sing and... 450 AC volts was the results. Peak to peak.
===

265 turns on the Pickup with 28 gauge wire I pulled out of a levatron.

===
Mine is newbie wire 24 gauge.
===
I asked about the bridge and he answered...

The bridge only has the basic primary in it like Hazen1 would do.


The metalized cap might be .1pF I didn't have time to check on all my parts but it is either .01 or .1 at 400v

the one metalized cap is coming off the bridge and is on both the - and + ( be careful this will blow most LEDs)
the supercaps are hooked up on the input voltage side but are at the end and past the coil wires ++ and - for the emitter

===
In the end he replied with:

Yes the 2N3055 will start up hooked up either way but if I switch it around it is like 2 or 3 hundred volts.

===
This is true in part for me too.
I found that amount of difference from 80v Peak to peak went to 450 volts p2p.
BUT as I have said, mine would not even turn on until I had 13 turns on the base.
I have 2 3055's that I wired up and tried with this too.

jeanna

[electricme]

@TheNOP

thanks

there are 2 reasons for why i am like that.
the first is my fear of not be understood because of my english.

I wouldn't worry too much about not being understood, because of your english, as far as I am concerned its understandable, well to me anyway.

Being brought up New Guinea, I learnt Pigion English before english, so it took a while for me to learn the english, I always had trouble with it, so you are not alone Bro.

I'm glad this forum has a chap like you here, (and others also) who does know a lot about electricity, it's formulas etc etc. You are a treasure house of knowledge NOP.


jim

[jeanna]

Hi Mark,
I think most of my difficulty here is with language, so please bear with me...

@jeanna

I made a new mk , with one pick up coil going one way and the other both

OK you made one MK with half of it wound straight and the other half wound up and down?

, and both pickup coil light the led both ways

Yes, they should be able to light leds.

so the secondary both way doesn't make it happen but the jt coil at 180.

[does?]
You lost me here.
Please try to say this again.

The mk was never design for a 3 inch toroid , it was design to make the most of the 1 inch toroid,

Yeah well, it works great. better than I expected, but I don't know.

but now tell me can you put a coil at the 180 from the jt coil , and check if voltage is similar or not , or even more fun you could but a second jt circuit on at 180.

In fact there is another jt at the 180 just sitting there. It is the one that had too few turns on it so I couldn't get the transistor going.

I was actually planning to make a 4 direction (the mk1 design) pickup on that section of toroid, just to see, but I want to finish looking at my set up first.
I want to fix the battery caps.
I noticed today when I moved the breadboard and I happened to touch the top of one of those caps, the light flickered deeply. I may only need to have more farads less volts there. (I have 25 uF 200v instead of 100uF 50v at the battery.)

please help me understand your suggestions.
thank you,

jeanna

[Mk1]

@jeanna

I am saying that the way the pick up coil on the mk up and down doesn't make the LED light both ways , but the jt coil at 180 do.

second , since you got room for more coil i tough you could try going back to the regular mk since now you got a mix of two design , or put a second jt(full circuit) on the other side.

Mark