The Siren Board

Discussion of Outdoor Warning Systems
It is currently Thu Aug 13, 2020 11:50 am

All times are UTC




Post new topic  Reply to topic  [ 1 post ] 
Author Message
PostPosted: Thu Jul 16, 2020 5:19 pm 
Offline
New User

Joined: Thu Jul 16, 2020 5:11 pm
Posts: 1
Real Name: Ethan
I just bought an old Universal Security Instruments SA-1R 12V siren at a garage sale. It has a small rectangular box mounted on the outside with three wires connected to it: Red, white and black. I took apart the motor housing and see that the red and white wires connect to the inside of the motor, the black wire is ground (as you may have guessed.)

Inside the externally-mounted rectangular box is a coil of very fine magnet wire and a contact mounted on a flexible metal strip. I don't know what this device is called, but I know that it sets up an oscillating magnetic field that causes the strip to vibrate rapidly and periodically make an electrical connection. The last time I saw something similar to this was in one of those fake-book pranks where it looks like a little book bound with metal foil. When you open the book you trigger a pendulum that swings back and forth through a coil of wire, generating a mild (but surprisingly strong) electrical shock.

Anyway, it seems that this is defective (a lot of rust flakes fell out when I opened it.)

My questions are: What is this part called? Is a replacement available?

Regards,
Ethan


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 1 post ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 16 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to: 

Powered by phpBB® Forum Software © phpBB Limited