Bedini Schoolgirl

[Robot77]

Hi Robot,

Welcome to the forum......
How your setup going?

hi selamatg!

thanks! still not running yesterday i tried that very simple circuit mentioned in the beginning of this thread. but nearly same results. though i could make some good measuring and a magnetic field was established when wheel speed was high enough (but only 3-5 volts coming through the powercoil with 12v input) (about 50mv in TC while field is up - if not only )

i really thing it depends on my coils, so right now i´m waiting for the ordered wire to build me a new one... but, slowly my picture of the whole thing clears up ... and i thought about building that whole thing more openly so that every part of the circuit could be replaced pretty quick...

so again... the real revolution should be the evolution of the mind ...

hopefully more to come,
robot

[darkwizard]

The diode here will increase the south pulse positive voltage and current and keep the transistor safe in the north pulse negative current.

A little moment before virtual south appears... the transistor will trigger on and the coil will charge with current... and this will move the rotor.

A simulation, the trigger coil generates a sine wave, not a perfectly one but, this will simulate very well what is happening here:

[darkwizard]

try to decrease the base resistor on the transistor , it will produce a voltage increase in the trigger, the resistor in this particular case will decrease the voltage and current and will put some kind of energy here that trigger the transistor this is from my own experience, but if you don't have the minimun current and voltage the transistor will not function properly.

I don't know why my transistor triggers with values 680 ohm resistance in my setup, , what i saying here is : the colector emitter voltage is 12 volts when the transistor triggers on, the current 50 ma, with a base emitter voltage of 2 or 3 volts and current 1 or 2 ma , this is no conventional trigger!




simulating my setup, 1hz frequency here is just only to view the wave in the right form

[BinzerBob]

Has anyone tried the Trigger and Energized winding in the bifilar setup to have the same gauge?

I was thinking of making a new coil, with 28 awg and 28awg (instead of say 23awg and 28 awg).

Any comments on what I am thinking of doing? The real reason is cost. I already made two coils, one uses 20 awg and 24 awg. The 20 awg wire makes the coil get very wide and expensive. I have another coil made with 24awg and 28 awg. I ran out of the 24 awg and have very much 28 awg (thinner wire the coils are very small for 500 turns!!! and not so expensive)

[theremart]

Same gauge.

Has anyone tried the Trigger and Energized winding in the bifilar setup to have the same gauge?

I was thinking of making a new coil, with 28 awg and 28awg (instead of say 23awg and 28 awg).

Any comments on what I am thinking of doing? The real reason is cost. I already made two coils, one uses 20 awg and 24 awg. The 20 awg wire makes the coil get very wide and expensive. I have another coil made with 24awg and 28 awg. I ran out of the 24 awg and have very much 28 awg (thinner wire the coils are very small for 500 turns!!! and not so expensive)

Hi,

I have done this several times... Not optimal, but does work. What I have found that works even better for me is to wind the power coils first, then wind the trigger on top. This gives you more power as the power coil is closer to the core.

Much depends on what you are trying to do... You want the coil to match the size of your batteries. If it is getting hot it may be you do not have enough winds on the coil, I had this problem when I made my multicoiler..

[dambit]

You want the coil to match the size of your batteries. If it is getting hot it may be you do not have enough winds on the coil, I had this problem when I made my multicoiler..

Hi Mart,

Is there a calculation you use to do this or just a guestimate.

Cheers,

Steve

[ren]

It has alot to do with the impedance of the battery Steve. I cannot go much further than that because I dont know much about it. There are better wire gauges for larger batteries than the 23/26 IMO.

[dambit]

I read somewhere that JB uses 18 Awg for his power coils, but that could be false. On the DVD the strands look pretty thick on the rotary device. (I know they are twisted). That would make sense as the device apparently has a very low overall impedance.

Cheers,

Steve

[ren]

Go for 1mm wire, and multifilars

100ft AWG 18 (SWG 19) x 4
100ft AWG 21-23 (approx SWG equal) x 1 for the master coil

100ft AWG 18 x 4 for all slave coils if multifilar.

Easiest way to make a big charger? Bundle as many lengths as you can onto one spool!

You could use 300ft lengths (or anything over 100ft for that matter, or under even) it all depends on what you want. Check the resistance of all power windings together, litzing can be advantageous in this circumstance.

[BinzerBob]

My opinion about AWG

Thanks for the replies.

I believe there is a trade off, the thicker wire should have less resistance and thus produce less system losses.. but the coil gets very fat. I am not sure what effect the wire winding geometry has on the electromagnet/pickup. For instance my one coil is about 6 cm in diameter while the other one which uses the thinner wire is only 3.5 cm in diameter. I am not sure how having the wire out on the outer edge of the larger coil compares in its magnetic effectiveness against the same outer wire on the smaller coil. It is much further from the iron core.

To keep the coil thinner and say to use less wire, one might consider to use a longer coil. But even this would increase system losses because there is more Iron core. There might be a optimal relationship between number windings, length of coil, size of wire etc to produce the best setup. But to consider this I think would be involved mathematically, or numerically (beyond what I want to consider or likely can figure).

I like the concept of first winding the energized coil then the pickup coil.

Thanks for all the replies.... now I have to make another coil.

Anyway.

[dambit]

Well, when I was figuring out the dimentions of my coils, I measured JB's ones on the dvd using references from objects of a known size. I figure if there good enough for him there good enough for me. The size I came up with is approximately 4" long by 3" wide with a 3/4" core.

I find that with a bobbin this size I can get about 900+ turns with four strands of 23AWG and one of 25AWG. I have found this size coil to be very effective and it doesn't get hot.

Cheers,

Steve

[theremart]

RE: matching coil to batteries

Hi Mart,

Is there a calculation you use to do this or just a guestimate.

Cheers,

Steve

I make this up as I go... But the best measure is to look at working systems and replicate.

but I got that manly from reading the dialoug between Sterling and Bedini. Bedini instructed Sterling on how to improve his setup.

Mart

[kick-bak]

Hi again.
Just a quick update on my sg.
Went out and bought a digital tacho n some more wire today.
She doing around 2500 - 2600rpm with 1 master and 1 slave coil. Only getting 4v out but at least im getting something back
Gotta make better coils, damn wire keeps rolling off the edge when using my electric drill to wind on the wire. I'm only using thick cardboard on the edges of my spools till I get hold of some welding rods and can then make real spools like you guys make.
I'd luv to share picks but the sg looks more like a Frankenstein and i'm already starting to loose track of what wire goes where.
Please keep posting picks of your setups as they are of great inspiration to me

[Guruji]

Coil sings

Hi guys I did another coil and changed the resistor and when I tried it one of the coil sings.Ok they said its self oscillating but does it charge the batteries and what about the second coil that I did?
It's useless now cause only the primary coil is singing?
Thanks.

[theremart]

Singing coil

Hi guys I did another coil and changed the resistor and when I tried it one of the coil sings.Ok they said its self oscillating but does it charge the batteries and what about the second coil that I did?
It's useless now cause only the primary coil is singing?
Thanks.

Normally that is a sign that your resistance that you added is too high. Best to stay to the standard schematics before changing things.

Keep at it !!