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Improved single transistor flyback driver

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LAN_403

quicksilver

Mon Jul 11 2011, 07:12PM

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

Doesn't require 4.7K capacitance but it needs to be fairly close & (in terms of voltage) a good idea is using one approx 1/3 larger than input voltage. RE: heat sinking & related issues, consider the current level of the battery as well (use heavy traces or wiring). The circuit itself is very flexible and works well for what it is. I really like the 2N3773 and if you have a decent heat sink the MJE13007 (I've also used 13009 savaged & all was fine) have gotten great results.

SaberShip

Mon Apr 23 2012, 11:26PM

Registered Member #4546 Joined: Mon Apr 23 2012, 02:46AM
Location:
Posts: 8

This is a great circuit! I'm using a MJ15003G transistor and have played around with it alot. I can get some nice 4cm arcs starting at about 1.5cm and the transistor hardly gets warm after several minuets on my 5" heatsink!!

I was wondering if the resonance cap across the transistor could be applied some how to this circuit using the MJ15003Gs ??
http://www.kronjaeger.com/hv/hv/src/fly/flyback1.png

The website that this schematic comes from is right here:
http://www.kronjaeger.com/hv/hv/src/fly/index.html

Any insight would be appreciated, thanks!

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