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Registered Member #4230
Joined: Sat Nov 26 2011, 05:50AM
Location: Socketville
Posts: 53
That circuit doesn't work right as drawn with 2N3055s, so I'm not surprised that it's blowing horizontal output transistors. The BUH517 are only rated for 8A continuous. They'll only take 15A for less than 5 milliseconds. Also, if there isn't enough base current to drive them into saturation, they'll be operating in what is called the linear region. What this means is that they look like resistors and resistors dissipate heat.
There are other better circuits out there. When you find one that works well for you, you'll be blowing flyback transformers instead of transistors.
Registered Member #4081
Joined: Wed Aug 31 2011, 06:40PM
Location: UK
Posts: 139
So if there isn't enough base current to drive the transistors, can I use a MOSFET? Also what (simple) circuit would you suggest to build? I'm not looking for masses of power, just something that uses 12V and makes arcs. Thanks everyone for being so helpful.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
hi Herry, I like pluging this web sight it has a exalent desription for beginers. After I found the ZVS circuit I'll never go back transistor flyback ciruits.
Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
I have a 2N3055 style driver that I made with the drive transistor from the TV and resistors from the TV. I put a resistor of a few ohms on the base of the transistor and used the flyback transformers internal primary coil with a feedback winding consisting of a few turns of magnet wire on the ferrite core. The whole thing works very well running off a 12V battery. The key to getting the driver to work seems to be finding the transistor from the TV circuit.
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Trouble with 2n3055 flyback circuit.
