Joule Thief

[Cap-Z-ro]

Great to see you back Wilby...hope just the fish were biting.

Regards...

[Pirate88179]

Wilby:

Welcome back!  Good decision.  We are about to have a lot of fun here.


Jeanna:

Stefan just opened a topic telling us about the switch.  It has not happened yet...very soon though.  He said we will loose all of our PM's so we need to back them up.  Check out his topic on this.  Then, there will, sadly, be some downtime. (according to Stefan)  But, after the switch, I think things will be a lot better.

Bill

[dog812]

@jeanna

Sorry to be confusing..
what i was saying is it wouldnt work with any resistor above 68 ohm.. the next resistor value i have higher than 68 was a 100 ohm lieing around and it would not work in the base position. And every other resistor i tried above 68 Ohm's did not work.. 100, 180, 190, 1k, 2.2k....
Only my 47 and 68 ohm resistors worked...

Also.. i am lighting the 3 LED 's off the secondary.. .. they light up very bright.. but only for about 24 hours.. if that matters

I just cant get any readings on my multimeter off the secondary wires... it just reads 0.0

I was wondering if that was normal?

[jeanna]

...
tuning the base R to get the led(s) to light to even brightness regardless of polarity will give the 'closest to sine' you can easily get without using a scope.

Wilby's back!!!

good.

I will give this a try. So, I put 2 leds into the bjt light place and adjust the base resistor til they look even. Yes?

This is probably the missing piece to make the wires going into the second tier on my 2 tier thing even. Right now, it makes a difference which one is where.

thank you,

jeanna

[jeanna]

@jeanna

Sorry to be confusing..
what i was saying is it wouldnt work with any resistor above 68 ohm.. the next resistor value i have higher than 68 was a 100 ohm lieing around and it would not work in the base position. And every other resistor i tried above 68 Ohm's did not work.. 100, 180, 190, 1k, 2.2k....
Only my 47 and 68 ohm resistors worked...

no that is not right.

Also.. i am lighting the 3 LED 's off the secondary.. .. they light up very bright.. but only for about 24 hours.. if that matters

That is about right.
The transistor takes a bunch and with the resistor anywhere below 1000 it will go that fast.

I just cant get any readings on my multimeter off the secondary wires... it just reads 0.0

I was wondering if that was normal?

that is normal. It is the reason I was pushed to buy the scope.

You must do the diode bridge and measure it better yet capture it in a capacitor before you will know.

It gets tedious, for someone like me, anyway.   

Have you taken the led out of the bjt light place?

jeanna