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Goodchild

Mon May 24 2010, 09:26PM

Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795

Like I said before and also 803 said you only need the 40Kv (big red wire)

Here is a good page to read up on flybacks and how to drive them:

aris

Tue May 25 2010, 08:46AM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

the second pole is the pin that arc ok?the pin of the ground and input poles which of them are and how i can know?Also i think to supply the flyback transformer with an second transformer that output 12v and 800mA,this is a good idea?Goodchild you use your flyback for tesla coil?If yes can you send me diagrams and parametres for exaple what input voltage you supply it ,how and what output voltage you got?..!

Goodchild

Tue May 25 2010, 02:25PM

Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795

Umm you can't use a second transformer to drive a flyback. Flybacks are high frequency transformers. The link that I provided before shows you how to wind a primary find the ground and driver them. Once you get the flyback working then we can help you hook it up to a tesla coil, but you have to get the flyback working first. You should read up a little more about flyabcks before you build one. Use the search tool there are loads of post from other people that have build flyback tesla coils.

aris

Tue May 25 2010, 04:55PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

ok thanks i search for it..The mosfet and other same things can be found to a tv or an other electrical machine or i must bought?If i achieved to drive it how i can mesured the output voltage and how i can decreased it to 7-15 to use it for the tesla coil?

Edit:It's essential i wind my own primary or the internal turns are sufficient for the voltage i want for the coil?

803

Tue May 25 2010, 07:09PM

Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
Location:
Posts: 191

if you wind your own primary, you will get more voltage, but less life, ie it's going to break faster. if you use the built in one, it will last longer, stay coller, but less voltage. it realy depends one you. i suggest using the build in one

just my $o.o2:-D

Proud Mary

Tue May 25 2010, 07:23PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Why not just look up the part number in the HR Diemen replacement LOPT index?

Mads Barnkob

Tue May 25 2010, 07:45PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

803 wrote ...

if you wind your own primary, you will get more voltage, but less life, ie it's going to break faster. if you use the built in one, it will last longer, stay coller, but less voltage. it realy depends one you. i suggest using the build in one

just my $o.o2:-D

The output voltage depends entirely on the number of windings, bus voltage of the driver, frequency of the driver and duty cycle of the driver. Saying that something will break faster with a self wound outer primary coil is nonsense.

Using the original inner primary winding can cause you problems as internal flashovers due to high coupling between the coils and flashovers at the connector pins of the flyback that could lead to destruction of your driver.

My only sound advice for you, Aris, is to study much more before asking more questions, you seem to be in a hurry to build a Tesla coil but you show a great lack of understanding of the components you are working with.

Study some more, then come back and ask some questions that show you have just some understanding and insight on the subject. You have almost repeated your questions through this thread despite numerous explanations and links to others work to study.

aris

Tue May 25 2010, 08:19PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

yes i am new in electronics and as a student i dont know very much about this:P..After some reading i found this easy circuit

Its ok to drive with it my fbt?Also i think to use this transistor:s2055af transistor insted of the transistor that use this guy!Its ok?

One more stupid question..The flyback is used only for solid state telsa coil or and for spark gap?

quicksilver

Wed May 26 2010, 03:17PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

A LOPT is used in many applications, To get a good idea what it does, search for "LOPT, applications, design" - not flyback. It's a pretty interesting device.

The 2N2055 has a appropriated rated capacity to handle the levels of current you MAY use but it's not the best performer. That's why most people avoid them and find alternatives. You look at it's data sheet & check out it's rated capacity. Most higher rated triode switching transistor will function but for the very elementary driver you want to make each part has a great deal of impact. You can find much better. And, yes, it will make a difference.

Additionally, in your example circuit, the gentleman uses what appears to be 1/2 watt rated resistors. That's not a good move if you intend on pumping more current than a 9v battery through it. Resistors in that circuit will get hot; they protect the transistor, etc. You need to follow an appropriate schematic & stick with the rated materials for your initial power supply. Here is the example (I believe) that is the classic "one switching transistor driver":

It's very simple and can use lower levels of current (than a ZVS driver). Save that schematic and use the appropriate parts. Substitutes may be made but go for a higher wattage resistor or a more robust transistor; don't substitute lower rated components. Try the 2N2055 and see if it meets your needs. Try to make a neat job: wires all over Hell can be a danger & an annoyance.

803

Wed May 26 2010, 05:27PM

Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
Location:
Posts: 191

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