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Old 14th December 2012, 03:36 PM   #31
vasko is offline vasko  Czech Republic
diyAudio Member
Join Date: May 2010
So I'll just use TL494 in push pull mode with two FETs with UF4007 and RC circuit. That will bypass flyback issues? And I'll use DTC to drive lamp without ballast cap/inductance.
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Old 14th December 2012, 04:26 PM   #32
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Join Date: Sep 2006
You can't do a push pull without a dual winding transformer. You'll have to wind one yourself, or use Class C with a (tuned) pulse drive. Normally lamps will need a ballast to run or they present a short circuited laod (or low impedance at any rate) which will ruin the resonant circuit, but this would normally be needed for any tube driver.

You can only set the inductance once you know the frequency your converter runs at, and the leakage inductance of your LOPT etc.

Many cheap circuits on the market do just what you suggested originally and run the tube from a pulse transformer, but the lamps don't last long - this is the point.

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Old 14th December 2012, 06:20 PM   #33
vasko is offline vasko  Czech Republic
diyAudio Member
Join Date: May 2010
Originally Posted by john_ellis View Post
You can't do a push pull without a dual winding transformer.

Offcourse I'll make dual primary winding for push pull, that's implies.
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