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Protection of LM4780

We want to implement 100V Audio Line System.So we are using LM4780 as Audio Power Amplifier.

 Is there any need of DC Protection Circuit  between Audio Power output and Audio 100V Step-up transformer? Please see this link.

 http://sound.westhost.com/articles/line-amps.html

In this DC Protection to amplifier from transformer is covered. We have to give DC Protection to LM4780 IC? If so what is the circuit to be added at the output before connecting to Audio Step-up transformer? 

There is no setup (Function generator) to measure the frequency at which the Transformer saturates. 

Please give information on this…

Suneetha