Joule Thief

[electricme]

@Free
Welcome to the humble Joule Thief forum, I have been away a few days.
I took a look at your UTube page, very nice man.

jim

@Stprue
That is a very tidy big toroid there, looks like it's been wrapped in gold leaf lol.

@All
Some months ago I said it should be possibel to tune the toroid by using a variable capacitor, and so it seems possible.
It appears there is another way to fine tune the JT, if you go to the below web site, scroll down.
At the bottom of the page, there is a circuit showing what looks like a JT to me, which has a "tuning capacitor" instead of a "base" resistor.

We should also be able to tune this further by insurting a tuneable "choke" which is a multy tapped sincle coil wrapped around a toroid placed in series with the JT primary.

http://www.qrp4u.de/docs/en/rf_ampl/index.htm

look for this, it makes very interesting reading too.

jim

[stprue]

That is some very nice work! I love the way it looks so perfect!

Nice job!

-Altrez

Thank you very much...I'll tell you one thing, it's a lot easier and quicker to wind when you can fit your spool through the center of the coil.

[the_big_m_in_ok]

TheNOP said:

a diode bridge with a cap at its output is known to do what you seem to be looking for.

No, but I'll show you what I mean:



                        AC from JT
                        |                | /
                        +-----|<----| |---+
                        |                | \    |
   Relay coil      ||(                        |
parallel with JT ||(                        |
                     ||(                        |
                     ||(                        |
                        |                        |
                        |     \ |               |
                        +---| |--->|------+
                        |     / |
                        |
                        |AC from JT


I remember this from an older Internet source awhile back, I think also dealing with free/alternative energy.  My previous circuits, elesewhere on the Joule Thief topic thread, were thought experiments to replicate and improve on this circuit immediately above.
NOTE:
The precise circuit, I recall, had the caps paralleled on either side of the relay coil, but were also presented as I show them here---oppositely wired.  I did it this way for ease of drawing.

The Relay coil could also be the JT transformer itself and this circuit was advertised as a recovery method for CEMF.

My question is:
Is there any limit to the number of these that can be added to the JT/relay coil?  Does Lenz' Law come into play with this tactic?

--Lee

[altrez]

@Free
Welcome to the humble Joule Thief forum, I have been away a few days.
I took a look at your UTube page, very nice man.

jim

@Stprue
That is a very tidy big toroid there, looks like it's been wrapped in gold leaf lol.

@All
Some months ago I said it should be possibel to tune the toroid by using a variable capacitor, and so it seems possible.
It appears there is another way to fine tune the JT, if you go to the below web site, scroll down.
At the bottom of the page, there is a circuit showing what looks like a JT to me, which has a "tuning capacitor" instead of a "base" resistor.

We should also be able to tune this further by insurting a tuneable "choke" which is a multy tapped sincle coil wrapped around a toroid placed in series with the JT primary.

http://www.qrp4u.de/docs/en/rf_ampl/index.htm

look for this, it makes very interesting reading too.

jim

Jim,

Thanks for sharing that link its very interesting.

-Altrez

[gadgetmall]

Hi everyone . Not much happening here . This is a bit off topic and it concerns German Ingenuity . What will they think of next I wish i had one on my street 
http://d.yimg.com/kq/groups/9577550/168641286/name/SpeedBump.wmv

Gadget