It is crucial to match amplifiers to speakers correctly and use them with care. But in some cases you want extra protection from blowing up the speaker. I have thought of a ridiculously simple idea - to use zener diodes parallel to the speaker.
- Zener diodes let through current only after certain voltage point (for example 5v) and by doing so they keep the voltage stable at that point. Zener diodes are mostly used as voltage regulators.
Not sure if it is wise to do so and how it will clip the sound when the diodes start letting through current of overvoltage but as I see it - it might clip the sound badly but it will still protect the speaker from too much voltage going in. I have found few circuits using this technique but descriptions are really lacking and I am not sure what to expect.
Sure, there are better options than using zener diodes as speaker protection circuit but for the sake of simplicity I am very interested if this would work as intented - protect speakers from over-voltage and power peaks.
My (simple) circuit design:
*Light diode acts as a clip indicator
Similar circuit I have found online though it does not use any resistor in between them basically creating a 2ohm short for voltages over (in example) 5v. Could anyone comment how would amplifier handle such circuit design?