it's working?!!!!!

[NickZ]

   Guys::
   It's not that the Jtc stops at 1 volt or lower, but the charging of the second charge battery stops once the run battery gets below 1 volt, because the led is on, there is no real charging going on, as the charge battery would need at least 2 or 3 volts over what the led takes, to charge up, especially if the led light is on.   AAs will normally last all night on the joule thief on with a single AA (or 24 hours or so), but that is dependent on the number and type of Leds. The above is for the battery swapping circuit.
  The idea is to make a Jtc that will be useful, economical to run, and will last at least all night lighting several leds with a usable light intensity, not barely lit, for a week with a useless light intensity.
  My point was also that more leds means shorter run times, even if they are on the pick-up coils.  There is a correlation between the leds and the battery run cycle. This thing about
the secondary coil not draining the battery because its not directly connected to the primary is just not true.
500 leds will only light for one hour even when using the best 10.000 perm ferrite core.  Maybe two hours, thats it...
  So, the question is: how many leds are best for a single AA.  24 hour run time (bright).

   A couple of cement batteries connected to a Jtc is the only portable free light idea I've seen yet.  No wires going anywhere outside the house, not dependent of sun, wind, or frozen ground.

[Pirate88179]

@Bill:

For low voltage and low power Joule Thiefs I use the transistor BC547B. Could you please tell as a better one, possibly a transistor which turns on with 0.2 Volt at the base?

I would also like to see a good specification of your "larger Bedini motor which charges your batteries for a year or more"? May be you can download the specs into the download area of this forum? There is endless information about Bedini motors, but details are almost never published. Specially the parameters of the coil and the magnets are hard to come by. Also the circuits often leave lots of questions open. I suspect that the builders do not want to spend the hours necessary to document something comprehensibly.

Greetings, Conrad

Conrad:

All of my small JT circuits use the old 2N3904.  The light I made for my Mom ran 24 hours/day for about a month and worked fine off of "dead" batteries.  when I checked those batteries once it stopped working, the all had less than .2 volts in them, some even less than that.  I made a short video of that light on my Youtube channel.

The specs for my Bedini are going to be hard for me to remember, specifically.  I can try to look them up but, there are several videos on my channel on this motor.  From memory, I used a basic Lidmotor transformer coil with iron nails as a core. (The transformer coil is nothing more than a discovery by Lidmotor that when winding the coil, if using the RS mag wire as supplied, you get a lot more of the lighter ga. wire than you do the thicker ga. so, when you run out of the thicker, you just keep winding with the thinner until gone.)  I designed a simple device where I can adjust the gap between the rotor and the coil at will, and very exactly.  I used a vcr head and very strong neos with the south poles facing out.  It hits over 10,000 rpm on 12 volts.  I still keep burning out my 2 vr's no matter what ones I stick in there.  (I used 2 of them) Transistor is the 2N3055.  I used an 80 volt neon as well.

If you have any specific question that are not answered in my videos, just let me know and I will go back and look up the info.

Bill

[conradelektro]

All of my small JT circuits use the old 2N3904.  when I checked those batteries once it stopped working, the all had less than .2 volts in them, some even less than that.

The specs for my Bedini are going to be hard for me to remember, specifically.  I can try to look them up but, there are several videos on my channel on this motor.
Bill

@Bill: thank you for the answer.

Concerning the 2N3904: I also used this transistor and my observation was, that it may run with less than 0.65 Volt, but it did not start with a lower Voltage than 0.65 Volt. Therefore I never tested how low down it still oscillats once started with 0.65 Volt.

Your Bedini-motor: I looked at the four videos. The VCR head is a very good idea because this wheel runs fast, accurately and quietly. The coil adjustment mechanism is very useful and seems to solve many problems. Somewhere there is an old VCR hidden in my house and I will try to find it. I collected some other wheels nicely mounted on good ball bearings from old printers. Further I put aside some old hard disk drives and CD-drives which could be used and one can even get some electricity from the motor (which acts as the bearing and also acts as a dynamo when it is span at high revolutions).

Your videos give nice ideas and the only question left is the circuit you implemented. I am sure it was published in some thread in this forum. May I trouble you to point me to it? Or you might still have the circuit on your PC, so that you could repost it? (Although it would be off topic.)

Did you ever try to run your Bedini-Motor in a closed loop via an electrolytic capacitor? Two rather small batteries (e.g. 100mAh)  would also be impressive (swapped by help of simple hand activated switches every few minutes)?

I did some tests with pulse motors and the power consumption could be brought down to about 100 Milli-Watts (still spinning well and fast). Therefore the use of big batteries on a Bedini-Motor would suggest a long run time, but one year is very good performance.

Sorry, I know that this was all discussed in some threads some time ago. Please point me to the right threads I would like to read up on it.

Greetings, Conrad

[Pirate88179]

Conrad:

Interesting thought about the 3904...I can't really say if I ever tried to start a circuit below that voltage, I only measured the battery after it stops working so, we both may be correct here....interesting.  I learn something new every day.

Thank you for your kind words on my videos.  I can't believe it has been 2 years since I built that particular Bedini motor...wow.  I used the schematic and resistor values from this video:

http://www.youtube.com/watch?v=mOGjLDU2lX8

The only thing different is I used the Lidmotor transformer coil which is very simple, but I can point you to one of his videos where he explains how to make it.  I used the same style coil in all of my One Magnet No Bearing Bedini motors, one of which I can run from my earth battery. I also added a second vr.

This guy on the above video does a lot of good explaining as I had no real clue about the Bedini Motor prior to building some of them.  Oh, I only placed the south side of the magnets facing out by mistake, they were suppose to be north facing out but I screwed it up.  I was told it would never work this way but I tried it anyway as it would have been a real pain to remove and reverse them.  They have to on really well due to the forces involved.  At those speeds, you do NOT want a neo flying off.

Funny, I just e-mailed John Bedini and asked him if he, or anyone he knew, ever ran his motors using supercaps only.  I have not heard back from him but I have always wanted to try this.  They could possibly store those high volt spikes in a more efficient manner than a lead/acid bat.

I had made a screen capture back then of that guy's schematic from the video but i can't find out where I put it, but, that is the exact circuit I used.  There are several videos in his series and all are good.  I believe the complete schematic is in the one I posted the link for.

Let me know if you have any more questions, or if I missed something.

I apologize to all for the off-topic posts.

Bill

[conradelektro]

@Bill: I found a circuit posted by jonnydavro in http://www.overunity.com/index.php?topic=7113.0 (Topic: One magnet no bearing Bedini motor), see the attached drawing. It is almost identical to the circuit from the video of  introvertebrate
http://www.youtube.com/watch?v=mOGjLDU2lX8

It looks like the circuit you used for your VCR-head Bedini motor.

I also found the video from Lidmotor about how he wound his Bedini-coil (with transformer action)
http://www.youtube.com/user/Lidmotor#p/u/336/WkLmRlHKJIY

To wrap this up:

- Did you use this L3 (12V relay coil) as depicted in the attached circuit?

- Your two variable resistors and the resistor at the base of the transistor, are they 10K, 1K and 100R, as in the attached circuit?

These are my last questions, thank you for your patience.

Greetings, Conrad