Joule Thief

[rensseak]

@renseak,
This is interesting that you can do this.
Please tell us the amps draw from that array.

Also, is there anything else that is different from the regular jt circuit in that? If so please supply the information.

jeanna

@jeanna

i connected my dmm  to the plus side of the bat. in series between the rest of the circuit and it reads 63 mA. rectified it reads 9.7 V at 0.41 mA, so there is no big change in measuring and also in the circuit it self except that i rewound the coil and using the twisted wire as it is like you can see in the photo.

Norbert

 

[xee2]

@ jeanna

Drawing with some LEDs added.

[Cap-Z-ro]

Posted on the Coral Castle thread...food for thought possibly.

"
Hey Pese,

I recall that Ed was said to be heard singing to the coral stones...something I feel is an important component of his work.

Over on the 'joule thief' thread they make reference to the coil making an audible sound which they tuned into silence.

I'm wondering if the frequency of that sound could be tuned to accomplish what Ed did by looping the secondary coil around an heavy object ?

Regards... "


Regards...

[jeanna]

@xee2,
VERY NICE. thank you.
lets make a note of the page for newcomers so we can help them and so this is our standard terminology. It is what we have been using, and now with the drawing to ID the names, things should get easier.

@All,
Is there a table somewhere that describes  the wavelength relating it to the frequency? If I find one I will post it.
EDIT: I found what I was looking for. an applet from msu. It shows that all the wire lengths in a range that we can and are using correspond to radio waves and maybe a bit microwave. If it is below 1/3M it is a microwave, if I remember. anyway... done.

@MK1, are your secondary lengths arbitrary? or are they relating to the wavelength you want?
You seem to tune them to the toroid, but not the frequency desired.

I need to wait for my precision pots. RS didn't have them or I'd have bought one for use today. My best toroids have at least 6 + 6 turns for the primary... so far, anyway.

@Cap-z-ro, That sounds good. 

thank you all,

jeanna

[Mk1]

@jeanna

i tune the numbers of jt coil to get the best output , but also use the trimpot the find the freq needed for the toroid , i drive the transistor the the needed freq.Every time a make adjustment i also check the trimpot , with the meter one the pickup coil , so i get a better idea of what is going on. I spilt the coil bot many reasons , first the have a better voltage over the whole toroid , because it doesn't rotate , also create a bigger opposing field , isolating the pole create the ac , also make more room for pickup coil (in a prime location on a free toroid), i also try to keep the jt turns low , because it then takes less pickup turns to get higher voltage.

Not all toroid work the same , they all do but when it comes to pickup coil ferrite is a good choice because it works good at a greater freq range , but does not the the real high voltage , powder iron need the right freq and jt turns i bit harder to get working , but even some are better then others , learns about the toroid , buy always having a pickup coil
on and connected to meter and tuning the trimpot finding the sweet spot .

So far i get the same voltage and usage of all my pickup coil .even when i got 16 .

I have blown many led , with this , then they still work but not in all situation like new ones .

The 30 inch is about 22-27 turns on a 1 inch toroid , some toroid give me max 48 volt from 30 inch, and others up to 140 volts , but 48 v x 16 that is still quite good . That said i usually get 48 volt from the toroid in power sup the bigger ones .

Mark