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Electrical advice - old fire alarm bell
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<blockquote data-quote="Perplexed" data-source="post: 3845346" data-attributes="member: 7157"><p>Thanks for the advice, folks. I’m learning a lot about how these alarm bells work!</p><p></p><p>I have a new-to-me bell; this one has a tag that says 24V, .38 amps, and when I look inside the housing, there’s a single big-butt electromagnet with a striker nested in the center. I don’t see any converters or capacitors, so I’m assuming this one runs on DC. However, when I hook it up to the DC variable power supply and dial in 24V and 1 amp, the striker retreats into the EM and stops. When I cut the power, the striker is released and emerges slightly. I can pull it out some more, but when power is applied, it retreats.</p><p></p><p>Wouldn’t that be a sign of AC power such that the striker is alternately pushed and pulled? I didn’t want to just plug in an AC cord before asking here, as I don’t care to see lots of sparks, smoke, and fire <img src="/images/smilies/wink.png" class="smilie" loading="lazy" alt=";)" title="Wink ;)" data-shortname=";)" /></p><p></p><p>Pics below.</p><p></p><p>[ATTACH=full]297333[/ATTACH]</p><p></p><p>[ATTACH=full]297335[/ATTACH]</p></blockquote><p></p>
[QUOTE="Perplexed, post: 3845346, member: 7157"] Thanks for the advice, folks. I’m learning a lot about how these alarm bells work! I have a new-to-me bell; this one has a tag that says 24V, .38 amps, and when I look inside the housing, there’s a single big-butt electromagnet with a striker nested in the center. I don’t see any converters or capacitors, so I’m assuming this one runs on DC. However, when I hook it up to the DC variable power supply and dial in 24V and 1 amp, the striker retreats into the EM and stops. When I cut the power, the striker is released and emerges slightly. I can pull it out some more, but when power is applied, it retreats. Wouldn’t that be a sign of AC power such that the striker is alternately pushed and pulled? I didn’t want to just plug in an AC cord before asking here, as I don’t care to see lots of sparks, smoke, and fire ;) Pics below. [ATTACH type="full" alt="F87C2825-8F9F-4B1B-8FB9-670F120814B2.jpeg"]297333[/ATTACH] [ATTACH type="full"]297335[/ATTACH] [/QUOTE]
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