Joule Thief 101

[Magluvin]

The phase shift video.


https://www.youtube.com/watch?v=EhpP7Bmcwhs



Brad

Hey Brad

Just thinking. Would the L2 trace lead if its peak is offset to the left of L1 trace peak?  Maybe Im wrong. Just thinking that leading is ahead of others in time. If the trace is left to right, then the L2 peaks before L1.  Either way though, you have shown the shift due to the magnet interaction.

Mags

[tinman]

I just got a PM from one of my "fans" directing me here because you are vibrating some ferromagnetic materials near coils, which is a well known pet peeve of mine
I never looked in here before because I expected this thread to contain some boring Joule Thief circuits - not an off-topic device like that.

I am too lazy to read the entire thread, so could you summarize for me what is your investigation about and what are you trying to determine?

Just have an oscillating  magnet in front of an air core transformer,where i can shift the current phase relationship of the primary and secondary to a state where the secondaries current can lead that of the primaries current. Once at the magnets resonant oscillating frequency,the primaries P/in drops while the secondaries P/out increases by over 2000%

Just looking into the effect ATM
See the mechanical resonance thread for the un/cluttered version of the topic

Brad.

[tinman]

If you block the magnet (but don't change anything else) and run through a wide frequency sweep in the same area, what do you see in terms of the phase relationship?

I have only tried raising  the frequency with the magnet away from the coil,never with the magnet in position -but held still. Without the magnet there ,i see little to no change in phse relationship up to 10khz,but do see amplitude changes.

I will try with the magnet in place when i get home from work tonight.


Brad

[tinman]

Hey Brad

Just thinking. Would the L2 trace lead if its peak is offset to the left of L1 trace peak?  Maybe Im wrong. Just thinking that leading is ahead of others in time. If the trace is left to right, then the L2 peaks before L1.  Either way though, you have shown the shift due to the magnet interaction.

Mags

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

[Magluvin]

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

Lol. I havnt dealt with phase of 2 signals for 25yrs. Hadnt the need to.  But was hoping I was wrong and you could let me know. I might have mistaken you in the vid.

Mags