Joule Thief

[TinselKoala]

I dunno about the specific black blobs but I do know about two, four-terminal devices that are used in garden lights.

[Pirate88179]

TK:

Thanks a lot.  I appreciate the reply. Can we get these chips on the market anywhere or are they just a custom, in house item?  I didn't see any resistors in those circuit diagrams so I am guessing they are just like mine with the resistance "built in" to the chip somewhere.

Some of my earlier lights that I took apart (which looked identical to the one I took apart for the photos) had an external resistor on the board.  None of my boards have a schottky diode though.  I realize that there are many variants of this type of circuit.

I am just impressed as this is the most simple circuit I have ever seen that is an actual JT and it works very well.  If I could find some similar chips maybe we can make it better by experimenting with the inductors?

Bill

***EDIT***   I just found this: http://www.flytron.com/electronic-parts/240-ana608-solar-charge-and-led-controller.html

The ANA608 is available.  I will try to order some in the next few weeks.  Thanks again.

[goku_092966]

or you could try QX5252

from simple JT circuit on my night lights to this cheap solar garden light circuits...

credit goes to MrFreddiew1 who posted improvement regarding this circuit on Youtube.

[Farmhand]

Anyone got any info on a garden light IC 52521H with 1008 under it, 4 pins ?
I think I can read the board traces so I'll try to make a drawing.

..

[Pirate88179]

http://www.led-ics.com/pddetaildate/product/detail/20110321_10775860_52521H.html

I found this site and schematic.  You might be able to translate this page.  This schematic is similar to the ones TK posted elsewhere.  It appears this chip only works down to .9v.  Some of the other chips we have looked at go down to .6 which to me, is more useful.

Bill