amplifier circuit - pls help

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shorabkareem

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I am building a simple preamplifier with TDA2822M IC to power my FM/MP3 player. my question is ? is it necessary to use a (1n4148 swithing diode) to protect my output (music) signal from my MP3 PLAYER. the voltage of my preamplifier is 12+v and my Mp3 player is using 5v.

last time i plug in my mobile phone in to my amplifier. My phone got bursted up? can you please explain why?

tks
 

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Cmos cannot handle any input getting greater than the supply rails due to a buried SCR in the substrate creating a virtual short circuit across supply. But I cannot comment on your circuit.
 

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