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I was wondering about these transformers. It says it requires a DC input (I think) however don't transformers need an AC input, and if so does that mean I would need to make an oscillator circuit to pulse the DC? Or can I just input AC?

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5VDC is just a misprint in the catalogue. Lower down it says:

  • Primary Voltages: 1 x 13V
  • Secondary Voltages: 1 x 1.34kV

So you should give it 12-13V AC, preferably as a sine wave, and will get just over a kilovolt on the far side. Take care to keep the two secondary outputs well away from one another and well insulated.

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  • \$\begingroup\$ I don't think anyone bothers to drive CCFL light transformers with a sine wave. Square-wave or modified square-wave is much easier, and the CCFL lights don't care about waveform anyways. \$\endgroup\$ – Connor Wolf Apr 24 '13 at 7:56
  • \$\begingroup\$ Does it have a noticable effect on EMC or efficiency? \$\endgroup\$ – pjc50 Apr 24 '13 at 8:52
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If you are worried about driving it, this diagram in a Linear technology article shows a connection method - it uses a Coiltronics CTX110092-1 which has the same coil configuration as the type you listed: - enter image description here

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