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Forums
4hv.org :: Forums :: High Voltage
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Platinum
Sat Nov 12 2011, 05:55PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Does anyone have all the parts I can use to buy from them?
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Antonio
Sat Nov 12 2011, 06:36PM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
You can order the parts at many online stores, if you don't have a store that sells these parts around. It's a very bad idea to assemble the device with wires without fixing everything firmly. A simple solution is to use a perforated board, or a simple thin plate of any insulating material (better one that resists heat) with holes for the parts. Better too to first determine which pin is the ground pin, to connect it to true ground, and when drawing arcs move a wire connected to the grounded pin close to the HV terminal, that shall be kept suspended in an insulating support and never touched.
Use heat sinks for the mosfets, and be sure that the core used for the series inductor is as thick as the core of the flyback, and that you have more turns on it that the number used in the primary coil on the flyback. Failing to follow this will result in self-destruction of the device.
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Platinum
Sat Nov 12 2011, 11:23PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Well I've just bought another soldering gun, not a very good one but good enough to use temporarily, So I'll order the 2 IRFP260's and I'll find most of the other parts I need.

I have this

Link2

Could I use this to power my flyback as it seems it pass 190 of power, my PSU is a 12v 32A so I need some resistor to limit the current to a max of 15A.
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Antonio
Sun Nov 13 2011, 12:10AM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
It's a good idea to put a resistor in series in the first tests. If everything works, remove it. The circuit will draw just the corrent that it needs from the power supply, not the rating of the power supply.
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Ash Small
Sun Nov 13 2011, 10:06AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
A couple of 12V 100W car headlight bulbs in parallel should limit current to ~16A. (I think)
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Platinum
Sun Nov 13 2011, 05:41PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I wired it up all right, but the flyback is only outputting millivolts according to my multimeter.
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Platinum
Mon Nov 14 2011, 05:49PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
What am I doing wrong?

I trying to make a flyback driver from a single 50W NPN bipolar transistor from a TV, I can do it, but I can confused here:


Sf3z2
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Platinum
Tue Nov 15 2011, 10:08PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Please will someone help, this is the onyl parts I get confused by, I've shown in the circuit.
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Antonio
Tue Nov 15 2011, 10:49PM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
This is the simplest part. Two resistors.
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Platinum
Tue Nov 15 2011, 11:47PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I know I'm using a 13009 from fairchild rated at 100~W, but I can't find the resistors so I used a 22 ohm and 270 ohm one, is this the problem, sorry.

The part I shown I can't get :(
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