Joule Thief

[jeanna]

Hi stprue,
I will.

thanks,

jeanna

[TheNOP]

@jeanna
your actual scope is telling you both, peeks and average(@60Hz = RMS).

one thing i am not sure if you know or not is that what a dmm is usually showing is the average voltage.
that average voltage pack more energy then the peek value you are reading with your scope.
to compair the voltage values of a dmm you need to compair it to the average values your scope give you, not to the peek value.

to be fully analog a scope require that no digitalisation(sampling) be made to display a signal.
a lcd display is digital by nature.

some analog scope also have a sampling rating.
but that is for signal storage and replay.

the highest frequency rating of a scope is the minimum time a scope can display the exact signal.
a 10MHz scope will not be able to display a 20MHz signal.
this is due to the fact that its internal circuits are not made for an higher frequency then 10MHz.

in an analog scope each position of the time scale redirect the signal to a different circuit.
this is needed to syncronize it to the display scanning rate in real time.

on a digital scope an A/D(analog to digital) converter is used.
todays cheap and mid range digital scope are using a 8 bits converter.
that mean 256 different posible steps(vertical axis) * the sampling rate(horizontal axis).
it is not a in real time display of the signal.

[jeanna]

Ah theNOP
Your last sentence is probably the best reason that stprue should not spend over 500 on a scope that is like mine.

I would like everyone here to have access to a scope, but not pay a lot for a pictorial display of a dmm. Mine makes a big deal that it is not a pictorial display of a dmm.

Mine will also give the rms, but it really does not apply to what I am doing; however it may be close to the dmm.

I gave the dmm results only so stprue could make his own comparisons.
I only use the vac on mine to let me know the range so when I turn on the scope it is safe.

My scope at peak to peak shows the spikes. The spikes are what is going into the 800 range and lighting fluoros.

I admit to not knowing much. I appreciate helpful help, too.

thank you,

jeanna

[jeanna]

Hi everybody,

Here is a little description of how to make the MK1
It really is only how to make the secondary part.
MK1 describes 3 ways to make the primary part. I peronally do not find them very different, so I do not want to bias this, by choosing one.
====
Overview first:

All the winds go the same way...from over the top through the center and around and up again.
You will be wrapping the coil in 3 directions ultimately. (because it is a toroid, this means the mags move 4 times)
Start at the bottom and end at the bottom.
You will end up with 2 wires.

In this example the total winds will be 40.
OK here goes:

Starting at the bottom left side leave a nice long tail for later connections  and
wrap the wire up 10 times
wrap one more then return to the bottom.
(if you don't understand this, draw 10 hatch marks on a paper then count the spaces in between them)

At the bottom, after you have wound 20 turns  you are coming out the bottom, so go over the primary windings and continue through the center.
(you can pull out a few inches for a center tap before diving through the center again.)
Continue winding 10 more turns up the right side and
wind one more and
wind down the right side to the bottom.
The total turns is 40.

Leave a nice tail.
Cut
sand the varnish off the tails-connect, and - tune.

(of course, you can wind the opposite way from my description; but, the point is to stay wrapping the same way throughout.)
Keep the crossed wires in the center if possible and on the outside put the down wires in between the up wires.


have fun,

jeanna

[electricme]

@ThaNOP,
Thank you

lol
nice drawing.
it look way more cleaner then my work bench...

i wish i could take pictures.
just to give you an idea, think of a scrap yard but filled with electronic junk pilled here and there in a 8' x 12' area.
with books, old computers, computer parts and accessories, almost all over the rest on the basement.
i am cleanning up tho, slowly...
i recycle everything that can be.

thanks for your previous comment.
but know that this house of knowledges is as crippled as my basement.
so you better do your homework and cross-reference what i am saying.
just like you should do with everyone informations.

Actually you discribe my place here nicely ha ha.

jim