Author Topic: How to build the vic tried and tested  (Read 37658 times)

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Re: How to build the vic tried and tested
« Reply #96 on: September 04, 2011, 17:03:05 pm »
Steve,
The flyback core two Cs are removed from the winding housing and seperated.  I wind a single layer iron wire around a thin plastic tube about an inch and half long just enough to fit in when I put the two flyback Cs back together.  Over the single layer primary I then wind on a copper secondary which is done by winding a 1/4 " high hump about 1/4" wide and then another next to it and then another until the end which is about seven or so humps next to each other, a lazy man's tricoil like approach with no seperator bobbins..  yep it is connected to my three inch cell.
kb

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Re: How to build the vic tried and tested
« Reply #97 on: September 04, 2011, 17:10:13 pm »
Steve,
 
Also, mosfets do matter, of the 1/2 dozen I have on hand they give me a range of 300v ptp to 700v ptp, except the irfbc40, which produces the 2.6kv, I've favored this mosfet for some time now, it is worth looking into the datasheet to see the difference it has, and nicely, they are cheap on ebay, about 50 cents each
 
kb

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Re: How to build the vic tried and tested
« Reply #98 on: September 04, 2011, 21:31:03 pm »
Thank you, KB
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Re: How to build the vic tried and tested
« Reply #99 on: September 04, 2011, 21:59:28 pm »
Kb,

About you using Fets, try to use transistors....
Like the 2n3055.
Fets have al kinds of demping stuff inside.
I got the cleanest signals with transistors.

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Re: How to build the vic tried and tested
« Reply #100 on: September 04, 2011, 22:35:14 pm »
Steve,
 
I was about to to try fets on the positve side and even bought some but got caught up in this iron wire idea.  I just wound another flyback to see if it was just a fluke or I was imagining things.  The one on the right side is new and beats the first one!!
What do you mean by demping stuff inside?  What 2n3055 circuit do you recommend I wire up?  I'm guesing I just pulse it off the existing mosfet driver anyway, correct?
 
kb, danka 

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Re: How to build the vic tried and tested
« Reply #101 on: September 04, 2011, 23:33:37 pm »
Steve,
 
I was about to to try fets on the positve side and even bought some but got caught up in this iron wire idea.  I just wound another flyback to see if it was just a fluke or I was imagining things.  The one on the right side is new and beats the first one!!
What do you mean by demping stuff inside?  What 2n3055 circuit do you recommend I wire up?  I'm guesing I just pulse it off the existing mosfet driver anyway, correct?
 
kb, danka
Yes, just use the same driver circuit. Maybe keep a resistor between the driveroutput and transistor base.

The Fets i used, seem to have a capacitance inside. Maybe because of the build in diode.
In all cases, it gave resonance between my coils. Not such issues with transistors.


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Re: How to build the vic tried and tested
« Reply #103 on: September 04, 2011, 23:59:43 pm »