§01 Yang The sounder is overloaded

Background introduction

   Dismantle the electronic pet dog two days ago   Got two speakers .  Their diameter is 35 mm .  The impedance is 30 ohm .  One of them has been damaged , Internal disconnection . So it was burned in advance .  For the last one left , Plan to check its overload by applying high-power voltage .

Experimental method

   Put the speaker on the bread board ,  Connected to DC power supply .  DC power use DH1766 Provide up to 32V, 10A Current .  By constantly increasing the applied voltage ,  Check the response of the speaker .

test result

   First apply 12V The voltage of . The following is the action of the loudspeaker .

  
   And then apply 16V voltage , The following is the speaker action .  The loudspeaker coil is burnt out , The plastic film softened and deformed .

※ total   junction ※

   this This kind of small loudspeaker has the maximum coil power ,  Beyond these powers , The coil will heat and fuse ,  And it will also damage the vibrating film of the loudspeaker .