Pulsed DC Transformer with Embedded Magnets

[ltseung888]

The Book and DIY package

It looks like the basic Joule Thief A can fit into a small circuit board.  I can include such a board with the components for the student buyer to assemble on the empty side of the board.

Now the decision is what to include?
1.   The basic Joule Thief?
2.   The Joule Thief A?
3.   Something more advanced?

What are your comments?

Second Comment from Lee

Lee: “I think that Mr. Chan is too conservative.  Let me show you the simple Joule Thief Charging Circuit.”

Tseung: “Thank you.  The only change to the Joule Thief is the addition of the Diode.”

Lee: “You should check this out.  If it works, the DIY kit will be much more valuable.”

Tseung: “I shall.  I know that one group in Hong Kong is working on something similar.  They will kill me if I give out this as a DIY kit with my book,”

[tysb3]

Hi, ltseung888

Yours circuit, I think , need to be corrected

[ltseung888]

Hi, ltseung888

Your circuit, I think, needs to be corrected

Thank you for your suggestion.  I shall try both.  Actually, I believe the LED is not even necessary.  It was put there to show that current actually flows to charge the battery.

[tysb3]

If curent trough LED was enough to charge battery, you dont need add diod.
In my way LED will become bright when battery will be charged.

[ltseung888]

If curent trough LED was enough to charge battery, you dont need add diod.
In my way LED will become bright when battery will be charged.

Thanks for reminding me.  LED stands for Light-emitting diode.  LED has the diode capability already.  There is no need for an additional diode.  All I need is to put the weak battery in the circuit to get it recharged.