Happy New Year for everybody,
It is me again but with good news this.
I've added a pre-amp as Nigel suggested using TL071 as audioguru suggested and the voice became quite good that made me to reduce the PA volume which resulted in low noise at output ( but not zero ). so I told myself why not to check jumids suggestion and put a piece of aluminum underneath the circuit, isolate it and connect it to ground. This made noise to ZERO. So my circuit has no hiss and no need to put your mouth on the Mic.
Thanks all of you again (Radio Ron, jumides, Nigel Goodwin, audioguru and Hero999 for you valuable participation to my circuit.