Joule Thief

[jadaro2600]

how did you found that, you have a frequency counter ?

This is a good question.

I have a DMM which shows me duty cycle and frequency.  I tested it on sound system with a tone generator, and things are fairly accurate.  I took the measurement between the base and the collector.  I assume that when we're talking about frequency on such a basic setup, that it's the frequency which is across these leads.

I've taken some others as well, so here are my revised numbers for this particular setup...


Measurement: Base - Collector: Across Inductor to Base
Duty Cycle: 78.6% : 99.9%
Frequency: 2.756 MHz:1.054 kHz

[TheNOP]

I tested it on sound system with a tone generator, and things are fairly accurate.  I took the measurement between the base and the collector.  I assume that when we're talking about frequency on such a basic setup, that it's the frequency which is across these leads.

I've taken some others as well, so here are my revised numbers for this particular setup...


Measurement: Base - Collector: Across Inductor to Base
Duty Cycle: 78.6% : 99.9%
Frequency: 2.756 MHz:1.054 kHz

cool
i can only guess when it come to frequencies.
a frequency counter cost to much for my current ressources.

what model is it and how much does it cost ?

[jeanna]

@Hazens1
Bravo!!
For a lot of things.
The price for those leds, for one.
The good output for another.
Glad you are back.

@Jadaro,
What does duty cycle mean and how does it relate to this?

@All,

I only have  a moment right now, but I just finally succeeded in collecting 6 volts from the second tier and. yup, you guessed it, The first tier had a (very weak and only partial) MK1 style toroid pumping it.

I will get into it more a bit later.

I also wanted to say, because Altrez wants to try an expensive hi permeability toroid, I pulled out my hi perm jt toroid wound with lots of secondary I think 7T,7T,68T maybe.

The thing as a first tier is just disappointing, as before, but on the second tier the most interesting thing happened and I believe it is the hi perm that is responsible.

The second tier lights (4 in 2 spots) blaze brightly.
There is one connection that the scope can find no volts 0.00v then bump, .6v for one spike, then back to zero.
It may have some use after all, because for the blazing lights the draw was 29mA.
For now, I am glad I did not take it apart.

jeanna

[TheNOP]

What does duty cycle mean and how does it relate to this?

frequency is the number of cycle per unit of time. second, microsecond, nanosecond, etc...

duty cycle is how much of this cycle remain in a state versu the other state.

ex: for pulsed DC, it is how long it stay in the on state and how long it stay in the off state for each cycle.
for AC it is how long on the + side and how long on the - side.

AC can be concidered as a tristate cycle, but the second state is almost never saw in electronic.
+ 000 - 000 + 000 -  is not something usual.
+ 0 - 0 + 0 -  or +++ 0 --- 0 +++ 0 ---   is

duty cycle in AC can be view like this:
+++ 0 - 0 +++ 0 -

in DC:
+++ 00 +++ 00 or + 000 + 000

[Artic_Knight]

if the red line begins where the green line begins then yep thats what i was talkin about!  if thats a green wire lead going through the coil to the red where the green wire sticks up then that is definately the design.  the whole idea is that the electricity takes the "same path" twice. of course not by the same wire. but if i remember correctly wireing one clockwise and the other counter will cancel all magnetism so the wires litterally have to be wound side by side.  i may not be able to test this as soon as i want but i would love to hear feedback since its tesla im allways all ears!