Prototype

[kaos513]

Here is my project prototype inject signal to mic socket.

 

[kaos513]

Update

 

[kaos513]

Used Snapple caps,speaker Jack,on,off swich

 

[kopcicle]

Jack off switch?

 

[500kpot]

Jack off switch?

I admire your sense of humor, Kopcicle.

 

[TM86]

Jack off switch?

Come again?

 

[WINKDOGG]

What will be generating the tone ? A tone gen app on a phone works great ! Just run an 1/8" headphone plug into a wire in your switch box and plug in the phone and pick sound in Mhz ! I have also just held mic up to speaker phone but I like building stuff si I will give your Idea a try muself , Thanks 73's