Hi Fred
Is ok.I ask something and until now you didn't answer me. I need the PCB. .I know I can hear a submarin even a angel .A good one .
You are a guru not me, so if you want you can add a fine tuning at this schematic for 5Khz and 8.7khz.
This can be your help in this project.Wait until the end....
I told you there is another device in this but we will talk later .First step build this ,make the improvment ..and see.
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