Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Classifieds
Media
New media
New comments
Search media
Log in
Register
What's New?
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Navigation
Install the app
Install
More Options
Advertise with us
Contact Us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Hobbies & Interests
Gearheads
Electrical advice - old fire alarm bell
Search titles only
By:
Reply to Thread
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Perplexed" data-source="post: 3827001" data-attributes="member: 7157"><p>I was able to plug in a variable DC unit and hook up the fire alarm to that; at 6V, the striker moved, but weakly, so I tried 12V, starting at 2 amps but the overload protection kicked in so I bumped the amperage first to 3, then 4, with the same result. Finally at 12V and 5 amps, the striker started hitting with authority. My question now is - there’s a tiny spark that forms whenever the striker hits a screw that limits its backward travel. Is this what normally happens if any of you have a similar vintage fire alarm?</p><p></p><p></p><p>[ATTACH=full]290211[/ATTACH]</p></blockquote><p></p>
[QUOTE="Perplexed, post: 3827001, member: 7157"] I was able to plug in a variable DC unit and hook up the fire alarm to that; at 6V, the striker moved, but weakly, so I tried 12V, starting at 2 amps but the overload protection kicked in so I bumped the amperage first to 3, then 4, with the same result. Finally at 12V and 5 amps, the striker started hitting with authority. My question now is - there’s a tiny spark that forms whenever the striker hits a screw that limits its backward travel. Is this what normally happens if any of you have a similar vintage fire alarm? [ATTACH type="full"]290211[/ATTACH] [/QUOTE]
Insert Quotes…
Verification
Post Reply
Forums
Hobbies & Interests
Gearheads
Electrical advice - old fire alarm bell
Search titles only
By:
Top
Bottom