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Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Hi, welcome to the forums. No, you need both windings for the oscillation to occur. You could try to find the primary windings at the pins on the bottom but I'd suggest that you wind your own. You don't really have to use magnet wire or anything. You can use any old insulated wire as long as it can handle he current.
There are other simple, powerful drivers like the ZVS flyback driver which is more efficient and can reach higher powers than the single or double transistor driver. Here is the schematics for the ZVS flyback driver. There are some good threads here and on the old 4hv forum about this driver.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
If you use the normal input winding, the feedback coil will have to be made with 5 to 10 times more turns, as the inductance of the primary winding of typical flyback transformers is around 1 mH, while with these few turns you end with a few tens of uH only.
Thanks and there comes other questions. Besides the sucking cup there are 2 more wires Is it necessary to insulate the wires and other pins and by what way?
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
The primary wires only need to be insulated to prevent shorts between turns to the core, and the HV wire out is already insulated. The pins on the base of the flyback rarely arc over with 2n3055 driver, however if they do, maybe using clear silicone caulking could help insulate (note that the HV ground must remain uncovered for connecting to the flyback.
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flyback and insulation driver coil winding
