Here is a link to a Russian website on these electroluminescent displays: http://www.155la3.ru/electroluminescent.htm a bit down you can see a few different ways to drive these. The Russians used a lot of small transformers to drive these, I used small 24V/230V 0.6VA transformers when I experimented with these displays and I learned that they don't like overtones nor anything other than sine wave as a drive signal, they quickly burn out and short circuit if you drive them improperly. You also need to use a current limiting resistor as that will protect them somewhat from catastrophic failure and save them somewhat if they are driven improperly.
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