Is joule thief circuit gets overunity?

[TinselKoala]

I am putting the problems related to the DC offset on the Atten aside.

Then you must also put "aside"... by retraction... all the data obtained from these inaccurate and improperly used bottom-end oscilloscopes until and unless the accuracy and precision issues are addressed and corrected. An honest scientist would make a public statement withdrawing conclusions based on faulty data from faulty test equipment.

It is very probable that I may have access to a 4-CH Tektronics in the near future.

The focus is on the energy saving aspects with twin timer 10 second ON and 2 minutes OFF.  The experiment continues into day 2.

I do not think high accuracy or expensive equipment is needed in this case.  Poynt99 has a demo board that can easily be ON without the battery for over 10 minutes.  He can confirm that the LED hardly dims in the first 2 minutes.  This is the "requirement" to develop a solution for at least 3 real organizations.

God Bless.

If a timer is required to produce these results.... then the power used by the timer must be included in the input power to the system.

Plus, the "requirement" to show extra efficiency is to show that the electrical energy input is converted to light output with more efficiency. That means brighter light, and/or longer runs at the same light level. Since you have no instrumental measurements of light level, you have no data. Confirming visually that "the LED hardly dims in the first two minutes" is an anecdote, not a measurement that proves anything.

[ltseung888]

The following was sent to Mr. Zhou and the Atten Technical Support.  I may have missed some firmware updates etc.

Both scopes showed crossing 0 ref line characteristics.  But the values were very different.  Both Scopes were re-calibrated according to the Instruction manual.  (The comparison may not be fair as I used CH1 Vrms as the common point.  The frequencies were clearly different).

That is why I prefer to wait for the Tektronics before doing more DSO analysis.  My advice to researchers is - get access to a high end DSO.  If you cannot have one in your lab, make sure you have acess to one somewhere. 

God Bless.

[ltseung888]

Is the "age of instant communication" turning
us into a lot of nagging, impatient old hens?

How difficult it must have been back in the
"Old Days" (pre-telegraph/telephone/internet)
when letters between experimenters on opposite
sides of the globe could take weeks or even months
to be delivered.

Are we any better off today or are we deceiving
ourselves when we think so?

@SeaMonkey

Do not worry about the comments from TK.  It is just his style.  Once you get used to it, you can pick out the valuable points and ignore the negative aspects.  The good thing about internet posting is that you can just ignore certain points.  Appearing rude is acceptable in heated scientific discussions.

I sow seeds.  My eyesight and hearing are poor.  My hands are shaky.  I have given up soldering and reading long manuals with small print.  I post my findings as they come along.  There is no telling whether I have tomorrow.  More than one-fifth of my old schoolmates already passed away.  The seeds are FREE and now I only send them to those who have high end DSOs and who specifically ask for them.

Internet posting is different from publishing a top scientific paper.  A top scientific paper takes months to prepare.  Internet posting takes minutes.  The standards are different.  I just post results as I understand them at the moment of posting.  Some mistakes or misunderstandings will be inevitable.  But I had to admit that I learned much in this process.  I think we are much better off today.....

God Bless.

[forest]

Unfortunately TK is right. Charge capacitor, do what TK is asking and face the music.... 

[ltseung888]

Unfortunately TK is right. Charge capacitor, do what TK is asking and face the music.... 

Any one can produce the Board.  TK actually produced one.  It will take him little effort to build another one.  He can do the above experiment himself easily.