Joule Thief

[Pirate88179]

Detrex:

Some of us have run Bedini motors from our JT's.  I have read about Newman motors but do not really understand how they are supposed to work.

It may be possible to dump the ac spikes from the JT into a very large Farad cap (I have used two 10 farad caps and later a 650 farad cap for this purpose) which will convert (or appear to convert) the spikes into usable power for your motor.  Now if you need to rectify it before the cap or not, I do not really know.  I didn't have to with the Bedini but, as I said, I am not sure what your motor really needs.

Bill

[resonanceman]

To Resonanceman,

thank you for your hints on air coils, very interesting, I have to try the twisted wire. There is so much experience with JTs out there in this forum, great!

The following idea is going around in my head:

In order to keep the energy consumption of a Joule Thief down one should go for very short duty cycles over the LEDs (or any lamps one wants to light up). See the attached drawing.

Very short pulses, even spikes might be good, but with high frequency in the Megahertz.

This might best be achieved with a secondary which has no connection with the circuit (besides induction and resonance). As I see from other folks posts, the secondary was the big progress with the JTs.

And for high frequency the air coil comes into play because of its low inductance. It is also nice to get rid of the Toroid because good ones are hard to come by.

May be I am on the wrong track with the "duty cycles" and would like to hear comments from the master JT builders?

Greetings, Conrad

conradelektro

I think  you  are on the right  track with the  your duty cycle ideas......

The  JT isn't  good at making  " normal " electricity.

It is  good  at making  spikes...... 

These spikes  are  what Tesla  was using in many of his  experments.
Tesla often  talked  about  disruptive discharge.....  we have an easier way  to make the spikes.........or impulses.

In my opinion   we need to focus  more on how to effectively  use the spikes........and how to  transform  the spikes into  " normal "  electricity.
So far  using the spikes  to charge  a battery seems to  be the most practical way to go.

gary

[crowclaw]

@ detrix

I have taken a look at your video and I go with Bill on this, storing the DC charge is the issue here. What is the current draw to run your motor with your present set up? You  need 1000 volts!! so you need some hefty caps that have to be both charged  and be capable of  delivering their charge within your time frame. We need to know what current demand is required at your target voltage to get an idea of what can be the best approach.

[resonanceman]

To Resonanceman,

thank you for your hints on air coils, very interesting, I have to try the twisted wire. There is so much experience with JTs out there in this forum, great!

The following idea is going around in my head:

In order to keep the energy consumption of a Joule Thief down one should go for very short duty cycles over the LEDs (or any lamps one wants to light up). See the attached drawing.

Very short pulses, even spikes might be good, but with high frequency in the Megahertz.

This might best be achieved with a secondary which has no connection with the circuit (besides induction and resonance). As I see from other folks posts, the secondary was the big progress with the JTs.

And for high frequency the air coil comes into play because of its low inductance. It is also nice to get rid of the Toroid because good ones are hard to come by.

May be I am on the wrong track with the "duty cycles" and would like to hear comments from the master JT builders?

Greetings, Conrad

conradelektro

I think  you  are on the right  track with the  your duty cycle ideas......

The  JT isn't  good at making  " normal " electricity.

It is  good  at making  spikes...... 

These spikes  are  what Tesla  was using in many of his  experments.
Tesla often  talked  about  disruptive discharge.....  we have an easier way  to make the spikes.........or impulses.

In my opinion   we need to focus  more on how to effectively  use the spikes........and how to  transform  the spikes into  " normal "  electricity.
So far  using the spikes  to charge  a battery seems to  be the most practical way to go.

gary


Edit

About  the frequency........ It is true that  a JT running  at Mhz speeds  would   be able to  create alot more power than  a slower JT.
The problem is  RF transmition. ....... The higher  the frequency ........or the power ......the more  ANY wire will tend to act as a transmitting  antenna. .........  I don't know about you....but I don't like the idea  of the FCC knocking on my door.

[Pirate88179]

Gary:

So, that is who those people were that were knocking on my door.... ha ha. (Just kidding)  But, you are exactly right.  If we get up into the higher freqs who knows what disturbances we might be making?  This is always a good thing to keep in mind.  Telling the FCC that we had no idea this was happening is probably not enough to keep out of trouble.

Bill