This is a simple way to made a Speaker from 12 volt Relay .
1- 12 Volt relay.
2- Plastic dish.
3- Strong magnet.
4- Audio Amplifier.

Connect The input of Audio Amp. to PC or any media player audio output.
Connect the output of Audio Amplifier to 12 volt relay coil  and fellow the below video.  

Note that the Audio Amp. used TDA1557 Chip shown in attached Data sheet. 

As an instructable, it's pretty good. However I wouldn't exactly call it a "tip and trick"
don't you mean that the other way around ? it's a trick, not an Instructable !
No. The author entered this in an electronics tips and tricks contest. This isn't something that would be convenient to someone doing elecronics.
Well , I respect your opinion but I considered a relay as an electronic parts and I made a tricks to convert it to a speaker , that's why I entered this to this contest. <br />
True. It is fairly impressive. How does this work anyway? Like, isn't sound analogue, and a relay digital?
<p>a relay is just an electromagnetic coil and some contacts, like an electric switch, there is NOTHING digital about a relay</p>
would any 12 volt relay work ? and why are the resistors there, wats their purpose used 4?
wow! this is something!
AWESOME! 'able

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Bio: Electrical Engineer
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