I'm starting to develop a VOX circuit to solve the following problem. Wife got new smart phone after flip phone went in water. We're on a boat. Wife's phone is inside now, she's outside working, can't hear the phone ring. Won't take the phone outside, I think she thinks she paid $0.01 for the flip phone and $200 for the smart phone and won't take a chance with it. So I want to build a VOX, it will hear the phone ring and turn on an oscillator to drive an already outdoor speaker. Two tone would be nice. So mic amp, This looks good, >
Any thought, simplification? I can probably just use the first part of the VOX circuit.
Mikek