Joule Thief

[electricme]

@Wilbe,
Your post on 380, the test you suggest, my JT wont light above 1k ohms, but if I drop the resistance, the LED gets brighter and brighter, and I have noticed one thing, for some reason, it is almost impossible to over drive the LED if it is connected between the Emitrer and Collector. The LED gets very bright, as I use my resistance wheel.

jim
 

[Mk1]

@electricme

I swear to god , sparks , you got to try this , you have what seems to me like the best toroid (the green one )to try this.
I just finish a new mk1 , 4 jt turns 22 bell, 15 foot 30 gauge , i get 670 rectified dc, i did not tune it yet , and i got to do the other side.

But the mk8 , charges caps so fast , 16 at a time , scary truly.sparks , and dose a fuji sound.

Mark

[jadaro2600]

I just ordered a bunch of 'crap' ...some Schottky diodes, toroids, transistors, ...capacitors, etc.  Perhaps I'll be able to make a decent Joule Thief later this week.

Things are cloudy with a chance of meatballs.

- - - -
I'm still wondering if the ingnition coil design may be a different approach to the toroid element of the joule thief;

Taking such an approach would mean using two different ignition coils with a switched ( alternated ) connection between the two of them.

+ ( ignition 1 ) X ( ignition 2 ) = resistor-base \ collector ...etc.  Passing the inner coil of one to the outer coil of another, reverse the connection.

It's too bad I don't have a more flexible method of diagramming circuits.

[jadaro2600]

If I'm expecting 900 volts of rectified DC voltage ..and I only have two capacitors capable of 500 volts each - is it a safe bet to hook them in series to measure the voltage.

..Wouldn't connecting the two give them the ability to withstand 1000 volts since it acts like a voltage divider?

-||---||-

?

[Mk1]

@all

Well now i don't get it the first 2 test gave me about 650 volts , i took a break to have a smoke then got bat to it now it only gives me 250 dc, and 135 ac , i will have  to test some more , so that is not so conclusive , nut has of right now , the mk8 is still delivering more power , but there is something i am missing now .

Mark