Joule Thief

[Mk1]

@jesus

I will have more answers today on the feedback, that said you forgot one coil connection option there 4 not 3.

Mark


http://www.alan.melia.btinternet.co.uk/toroids.htm

[nievesoliveras]

Perfect.

Thank you, Jesus.

AND your first 2 questions clarified my problems really well.

I will put the results together and post it sometime today... unless I find problems I haven't noticed yet.

...

jeanna

Jesus,

The problem I have with the use of clockwise and ccw is that if the viewer moves to the opposite side the direction changes. If you could greatly magnify the drawing, or better yet use a magnification of the MK2 as I did yesterday. I changed the names adding more names, because it only confuses us to have any names repeated but for different parts.

At the bottom of the MK2 is a clear drawing of the coils and their directions.

Anyone who has made one will be able to immediately know what the lines mean and the questions about the directions becomes very clear.

I think we should assume that someone has one to look at for reference.

A washer with string wrapped around it is enough to make a difference in following the questions.

I might put up a drawing that can be used for changes along with yours. for now, maybe

thank you so much for stepping forward.

jeanna

The clockwise we are going to use is this one:

We will wind the wire going through the toroid from the upper side and comming out from the bottom, then repeating the process again till the desired turns are achieved.

After finishing the first one without changing the toroid up and down present position move the toroid on your palm so the already made winding moves 180 degrees from you and start the same process again.

That is, going through the upper side through the toroid and coming at the bottom with the wire and repeat.

I will make a graphic later with this instructions included.

Jesus

[xee2]

@ jeanna

Scopes are very confusing because they have so many things that can be changed. Many, if not most, scopes are dual channel. That means that they are two voltmeters with the voltage of each being displayed as a separate trace. A dual trace scope has two probes and is usually used to look at the timing of pulses coming in and out of the circuit. For a dual trace scope each probe has two connections. I think you have a single trace scope. In which case you only have one probe. The probe is just like a voltmeter. It has two connections, one is the tip and one is the clip on the attached wire. Voltage is always measured between two points in the circuit.  You can not measure the voltage on a battery with just one lead of the voltmeter. You need to have one lead on the positive terminal and one lead on the negative terminal. Since voltage is always measured between two places, in order to understand where the voltage was measured it is necessary to state what the two places were that were used to measure the voltage. I am not sure if this helps or makes you more confused, but I hope it helps.

For instance in this drawing by jadaro2600 he shows the two points that the voltage is measured between.

[TheNOP]

A graphic explanation of my first question. It seems that the other one is misunderstood.

The question is on the graphic.

like xee2 wrote, the load must not be where you putted it.
unless there is a load on the + and - of the bridge, there will be no currents flow where the load is.


@jeanna
just like a dmm your scope got 2 wires to make the measurement.
some probe also have a 3 rd small wire on it.
that small wire on the probe is the same as the other wire.

[jeanna]

Thanks xee2,
No, it doesn't confuse me.

I want to be able to measure the oscillations that are occurring on the secondary. I want to be sure I am not introducing anything from the bjt, so I don't want to use the bat ends or the transistor legs or the resistor etc.

I just cannot think of what to anchor this clip to. (except another oscillating wire!  )

Thank you for this help.
===
@Jesus,

When you come out of the center of the toroid and go around are you going to the left or the right from the first?

I think it introduces a very confusing element here. And, please remember this is not a straight rod. It is a washer. So, it is circular and its cross section is also circular. I think this is a lot of the problem, and I don't think we should add to it.

Here is a modified 'blank' from the drawing Mark made of the MK2. I changed the numbers so that each wire end has a new number. What do you think? (other than it is not pretty!)

thank you,

jeanna