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Did you use an OEM board or after market board made by Dinosaur Electronics? That buzzing usually indicates a short someplace. Unplug the gas valve and try it again. Double check the polarity at the DC connections and be sure you didn't get the feeds on the gas vavle leads instead of the DC feeds. Easy to do......then get back to me. All follow ups are included in our fee.
Best to get the battery........these don't work well on just a converter. Especially an older one that may have too much AC ripple which is some AC current bleeding off into the DC side. Boards don't like that! The battery helps to filter out that when present. Put the battery in and try it again. IF you have a meter that reads in millivolts, set it on AC and take a reading AT the battery and see how much if any AC volts you have. Over .5 VAC is too much. Then you would need to upgrade the converter to an all electronic version.