QuoteHello Folks,
I had a question lately and I like to repeat it here since there was no answer  :

ANSWER: GET USED TO IT...

QuoteCan you give me an hint, what core-material of the hv-coil is suited best ?

ANSWER: UNKNOWN

QuoteI could imagine we are working here in the range of 20 to 15 KHz so a flyback-core-type would do it ?

ANSWER: UNKNOWN

QuoteAnd what material for the hc-coil which is sitting on the outside area of hv-coil ?"

ANSWER: DUCT TAPE

QuoteThane ?

ANSWER: RETARD

QuoteRegards
Kator

ANSWER: WE'LL SEE.

Thane,

this is very strange : after all this tedius work you have presented in your videos you do not know which core-material you used ?

I have to be more precise : not ... suited best ... but which one did you use ?

I understood from your comments that there must  be a secondary ring-core-material at the outer surface of the HV-Coil not duct tape - otherwise the delay  of  the kick-back does not show up.

You remember ?

QuoteCoil-Configuration:
CAN DO THE SILLYSCOPE READINGS NOW THAT I AM HAPPY WITH MY COIL DESIGN FINALLY.

JUST SO YOU DON'T GO OFF ON A TANGENT - THE HV COIL IS SET ON THE CORE - THEN THERE IS ANOTHER LAYER OF CORE MATERIAL AROUND AND ON TOP OF THE HV WINDING - THE HC COIL IS WOUND ON TOP OF THIS SECOND CORE SO IT LOOKS LIKE THIS: (SIDE VIEW)

HC WINDING
SECONDARY FERROMAGNETIC CORE MATERIAL
HV WINDING
PRIMARY CORE
HV WINDING
SECONDARY FERROMAGNETIC CORE MATERIAL
HC WINDING

CHEERS
Thane

Regards

Kator

THOU ART TOO SERIOUS MY MAN...

Quote"Can you give me an hint, what core-material of the hv-coil is suited best ?

SO FAR I HAVE BEEN GETTING GOOD RESULTS WITH A MICROWAVE TRANSFORMER CORES AND AC MIG WELDING RODS BUT YOU CAN SEE THE EFFECT WITH SIMPLE IRON CORES BUT YOUR HYSTERESIS CURVE WILL BE WIDE SO ANY ACCELERATION YOU GET WILL BE OFFSET BY CORE DRAG.

QuoteI could imagine we are working here in the range of 20 to 15 KHz so a flyback-core-type would do it ?

POSSIBLY - IN FACT THIS IS NEXT ON MY AGENDA LIST - SINCE I HAVE SEVERAL COLOUR TVS WAITING TO BE CANNIBALIZED.

QuoteAnd what material for the hc-coil which is sitting on the outside area of hv-coil ?"

ARE YOU TALKING ABOUT THE CONCENTRIC BI-COIL DESIGN?
IF SO IT IS RECYCLED MICROWAVE TRANSFORMER BOTTOMS - SIZED TO FIT AND PLACED AXIALLY AROUND THE HV COIL (LAID OUT ON THE WORK TABLE FIRST AND PLACED ON THE STICKY SIDE OF DUCT TAPE).

I WILL BE TRYING TOROID CORE MATERIAL IN THE NEAR FUTURE WINDING IT RADIALLY LIKE WIRE...

CHEERS
THANE

QuoteI could imagine we are working here in the range of 20 to 15 KHz so a flyback-core-type would do it ?

POSSIBLY - IN FACT THIS IS NEXT ON MY AGENDA LIST - SINCE I HAVE SEVERAL COLOUR TVS WAITING TO BE CANNIBALIZED.

I have thought about flyback transformers and have my doubts about them for the following reasons.
1) When working on a TV set you must discharge the HV anode on the picture tube. The picture tube has some capacitance, and like a MO capacitor, can store a lethal charge. ( I was nearly killed by one of these. Lucky only to get instant charley horse on entire arm! )
2) High voltage diodes are often built in on the secondary - This will probably be a source of loss, unless you are able to short or remove them.  Some flybacks also include a HV adjust pot, another potential source of loss.
3) Multiple primaries (Think dual center tapped transformer inputs) may be useful if used, but probably lossy if unused.
4) Possibly more dangerous due to ability to produce 4-5 times higher voltage than microwave transformer. (If short fails) Arcs can leap about an inch in air! You can receive a shock just getting close! Very similar to a Taser.

Perhaps old style automotive ignition coils may be a better bet, but I've never opened up the can.

Quote from: derricka on October 11, 2008, 05:51:15 AM

I have thought about flyback transformers and have my doubts about them for the following reasons.
Possibly more dangerous due to ability to produce 4-5 times higher voltage than microwave transformer. (If short fails) Arcs can leap about an inch in air! You can receive a shock just getting close! Very similar to a Taser.

Perhaps old style automotive ignition coils may be a better bet, but I've never opened up the can.

I HAVE USED AN IGNITION COIL - BUT MOSTLY I AM INTERESTED IN THE CORE MATERIAL RATHER THAN THE WINDINGS.

T