Carlspeak Posted February 9, 2010 Report Share Posted February 9, 2010 Visit the attached thread to learn more. Good discussion on the use of diodes in tweeter protection circuits and how they work. One poster claims they work better than fuses.http://www.audiokarma.org/forums/showthread.php?t=280504 Link to comment Share on other sites More sharing options...
Zilch Posted February 9, 2010 Report Share Posted February 9, 2010 Good discussion on the use of diodes in tweeter protection circuits and how they work. One poster claims they work better than fuses.Nobody's mentioned it yet, but they protect via clipping the waveform.[There may be an "UT, oh" in the approach.... ] Link to comment Share on other sites More sharing options...
Carlspeak Posted February 9, 2010 Author Report Share Posted February 9, 2010 Nobody's mentioned it yet, but they protect via clipping the waveform.[There may be an "UT, oh" in the approach.... ]...."More data less wank"???? Link to comment Share on other sites More sharing options...
Zilch Posted February 9, 2010 Report Share Posted February 9, 2010 Well practiced in the art, Ken's our expert on smokin' tweeters.More generally, he suggests that clipping per se is not the culprit, but in this case, the more you crank them, the more they approach pulsed DC.... Link to comment Share on other sites More sharing options...
soundminded Posted February 16, 2010 Report Share Posted February 16, 2010 Nobody's mentioned it yet, but they protect via clipping the waveform.[There may be an "UT, oh" in the approach.... ]Paralleled zener diodes connected anode to cathode connected across a tweeter will not form a class of circuit known as a shunt clipper or clamper. When the applied voltage exceeds the reverse breakdown voltage of the zener, it goes into the conduction band. The problem is that when it is forward biased it will conduct like a regular diode shunting the signal to the tweeter. This can be seen in the tutorial below;http://www.electronics-tutorials.ws/diode/diode_7.htmlThis device is best used for establishing stable reference voltages in power supplies and is a valuable element in a voltage regulator. A series resistor is needed to limit the current through it. A better choice is an MOV. This is a true clamper. But it has the disadvantage of effectively short circuiting the amplifier if the voltage exceeds the breakdown voltage. The best circuit design would be to use a current limiting series resistor with an MOV and that combination in parallel with the tweeter. This will avoid damaging both the amplifier and burning up the MOV. The MOV voltage should be carefully selected to take into account the voltage drop across the current limiting resistor and the maximum voltage the tweeter will see. Here's a tutorial; http://www.littelfuse.com/data/en/Applicat...note_an9767.pdfHere are some offerings;http://search.digikey.com/scripts/DkSearch...+oxide+varistor Link to comment Share on other sites More sharing options...
Zilch Posted February 16, 2010 Report Share Posted February 16, 2010 Paralleled zener diodes connected anode to cathode connected across a tweeter will not form a class of circuit known as a shunt clipper or clamper.They are not in parallel, rather, series connected in inverse polarity. Link to comment Share on other sites More sharing options...
soundminded Posted February 17, 2010 Report Share Posted February 17, 2010 They are not in parallel, rather, series connected in inverse polarity. That should work. One will be forward biased and the other won't conduct until it reaches its reverse breakdown voltage. I think a current limiting resistor in series with them is still necessary to keep them from burning up and from short circuiting the amplifier. Link to comment Share on other sites More sharing options...
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