Joule Thief 101

[Magluvin]

Like I said, either way you still show the phase shift.

Also, is it possible the difference in the 2 scope trace freq numbers, maybe the pendulum is trying to hold its resonant freq while the func gen is over or under that freq?

Mags

[picowatt]

The leading trace/phase is to the right-is it not? as the trace starts from the left of the screen,and travels to the right of the screen. So the one furtherest to the right is the one that started to the left first.
---OR i have been looking at scope traces wrong all this time lol.


Brad

It is not...  The left most trace is the "leading" trace. 

For example, at around 8:46 in your last video, the scope "appears" to be telling you that the yellow trace is lagging the blue trace.

I say "appears" because there are a few issues.  The first is verifying how the transformers are connected phase wise (dot convention) and second, I would want to use the second channel of the FG to generate a marker pulse, modified half cycle, etc, to confirm who is leading who...

I believe using a marker was touched on during discussion of your flywheel version of this setup, which was never instrumented as suggested to observe acceleration and deceleration of the flywheel.  Although possible, it would be a bit more difficult to do so with this new "waving wand" version.

PW   

[MileHigh]

Measure with a micrometer.
Mark with chalk.
Cut with an axe.

[tinman]

Measure with a micrometer.
Mark with chalk.
Cut with an axe.

There is no doubt about ya MH--->you are the king clown,and a liar.

And ultimately I am trying to help Brad.

Brad

[tinman]

It is not...  The left most trace is the "leading" trace. 

For example, at around 8:46 in your last video, the scope "appears" to be telling you that the yellow trace is lagging the blue trace.

I say "appears" because there are a few issues.  The first is verifying how the transformers are connected phase wise (dot convention) and second, I would want to use the second channel of the FG to generate a marker pulse, modified half cycle, etc, to confirm who is leading who...

I believe using a marker was touched on during discussion of your flywheel version of this setup, which was never instrumented as suggested to observe acceleration and deceleration of the flywheel.  Although possible, it would be a bit more difficult to do so with this new "waving wand" version.

PW   

I will be winding a new 1:1 coil tonight,as requested by Poynt,and will be able to supply the dot convention.
I cannot determine the winding direction of the primary winding of the transformer,as it is taped and lacquered,and the wire very fine. Guess i could use a compass and DC current to work it out.

Also remember the secondary winding is on top of the primary winding--not along side it as with a normal E core type transformer. So in this case,at the 8.46 minute mark,the yellow trace is actually leading the blue trace,as it was lagging at the start without the magnet in play,and thus show's the 90* phase shift as expected.


Brad