Toroidal Power Amplifier

[nilrehob]

I think this is the one i have, the 50V version:
http://www.nuvotem.com/en/products/pdf/1000P1_1001.pdf

And I think the core is GOSS (grain oriented silicon steel)

/Hob

[nilrehob]

i put a rectifier and a capacitor on the middle winding where there is no voltage,
only current when there is load on the right winding:

the "no voltage" part is not true
my meter is acting strange not sure why
I used the oscilloscope instead today and there *is* a voltage on the middle winding
in my case approx 0.6v/turn

i rewound the middle winding to around 25 turns to give me voltage suitable to charge a 12v batt

i do get some current in the middle winding without the load on the right winding
its not much but the 1.3Ah battery seems to charge somewhat
if i add the load the current on the middle winding rise considerably as stated before

this small current without the load on the right winding is what i was looking for
I think maybe Thane's BiTT works by having a (each) secondary with two cores channeling the bemf-flux to the second core (the right core in my setup when the middle winding act as secondary)
so without the load on the right im perhaps doing a first small partly BiTT replication?

I have to do more tests

/Hob

EDIT: BTW i did a middle winding with only two turns using the thickets wire i had
when shorting it and the right load on it made 45A and some smell...

[rave154]

Nil,

thanks again for doing those tests with limited time

your two-turn result makes some sense in that.....less turns generally is less voltage = more current.

hmm...this is kinda getting interesting

EDIT :-

yes thanes BITT, seems to get its gain not only from having the BEMF flux NOT intereferring with the primary flux ( and therefore making the primary draw more current )....but also due to the "geometry" it allows the 2 secondarys to feed each other

2nd EDIT:-

yes i think you have a sort of 2/3rds BITT.....do you have any other toroids of reasonable size.( or just ANY toroids with a winding )....that you could add in ?

[nilrehob]

thanks again for doing those tests with limited time

well, its freezing outside, reluctant to go out

your two-turn result makes some sense in that.....less turns generally is less voltage = more current.

Yes, i was surprised when i got no voltage, which was false, this does make more sense.

yes thanes BITT, seems to get its gain not only from having the BEMF flux NOT intereferring with the primary flux ( and therefore making the primary draw more current )....but also due to the "geometry" it allows the 2 secondarys to feed each other

yes i think you have a sort of 2/3rds BITT.....do you have any other toroids of reasonable size.( or just ANY toroids with a winding )....that you could add in ?

Sigh, I just ordered one, wife mad, not in stock so it will arrive in 2 weeks.

This is what im planning to do when it arrives:


/Hob

[rave154]

well, its freezing outside, reluctant to go out



Yes, i was surprised when i got no voltage, which was false, this does make more sense.



Sigh, I just ordered one, wife mad, not in stock so it will arrive in 2 weeks.

This is what im planning to do when it arrives:


/Hob

That diagram is exactly what i was thinking !

also, with 3 toroids, it opens up a few other possible configurations too

[rave154]

whats inside

Hi,

today at work i came across two, 240V CFL ballast's.... there were two inside each holding for one cfl tube. they are very heavy, about 7-8 inches long, 1 & 1.2 inches square, 4 wires.......resitances of 18 ohms & 28 ohm ( i think ).

so, anybody know whats inside them? ( id cut them open but they have little welds & rivets and i dont feel like filing right now )

Thanks

[rave154]

ok, i couldnt wait, i managed to chisel one of them open, yukky inside....sealed in....wax i think, and.....im not sure "what" they are exactly

[nilrehob]

I got my third toroid a while ago,
had two extra windings done (blue & green) on top of the original windings:


put power on,
lamps will not light properly unless the other lamp is there,
and not unless both primaries are powered.

any gain?
not sure yet,
probably not
i have been using two 15W bulbs
the two primary-cores unloaded consumes 10W at PF 0.7
with the two bulbs its 32W at PF 0.87
but the number of turns i did was too few,
i did 300 on each when it should have been 400,
as i only got 180V and not 240V

another thought
the two primary-cores (if using the topology as in pic)
should perhaps have less area than the secondary-core

/Hob

[Felix_the_cat]

Wire Core / perpendicular windings

I just finished winding my toroid that I plan to use for a hho cell. It has perpendicular windings and uses copper coated steel for the core, which is also the secondary.

I will use pulsed current in the primary ( red ) and hopefully the secondary will carry an alternating magnetic flux, that will be delivered to electrodes in
the cell.
check out:Bagel coil pictures by felaudet1 - Photobucket

[WeThePeople]

ok, i couldnt wait, i managed to chisel one of them open, yukky inside....sealed in....wax i think, and.....im not sure "what" they are exactly

Please be careful and breath very shallow and carefully while working with this material,
and wear latex gloves too !

The material in that ballast may very well be a high-level carcinogen type of insulative and thermally conductive potting material !

[blackchisel97]

ok, i couldnt wait, i managed to chisel one of them open, yukky inside....sealed in....wax i think, and.....im not sure "what" they are exactly

Since you have mention a chisel - maybe you'll find this useful - Compact fluorescent lamp There is a balast for CFL.


Vtech

[nilrehob]

I just finished winding my toroid that I plan to use for a hho cell. It has perpendicular windings and uses copper coated steel for the core, which is also the secondary.

I will use pulsed current in the primary ( red ) and hopefully the secondary will carry an alternating magnetic flux, that will be delivered to electrodes in
the cell.
check out:Bagel coil pictures by felaudet1 - Photobucket

Is it a kind of TPU?

/Hob

[nilrehob]

I finally wired the third winding,
but the test so far has been unsuccessful in replicating Thanes BiTT



so i guess next step is to pulse them ;-)

/Hob