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FYI, you might be able to salvage components from an old electronics device that you are planning on getting rid of (broken radio, answering machine, phone, ???).
It might be an interesting experiment to put a (not too) small speaker in line with the power lead. As an inductor in series it should help smooth things out when the horn goes off and provide 4-8 ohms of resistance on the power dissipation side of things.
Plastic case? Any metal involved?
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"I kicked a giant mouse in the butt! Do I have to draw you a diagram?"
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