Hello guys. I wanna know if you can help me with the design.
Here is what I wanna do:
I have a GPS system and XM radio connected to a single simple amplifier. I am using a toggle switch to change inputs GPS or XM.
I wanna know if it is possible to built something simple to make an automatic switching from XM to GPS when the sound comes from GPS (like spoken directions) and then if GPS stays quiet goes back to XM in like 30sec.
Finally found some time to get this done. I think it works pretty good. C3/R5 and R7/R8 gives me a delay of an about 30sec - just what I wanted. Used 4558 Op-Amp I found in my old modem (anyone should work).
Yeah - I drive a big rig and sometimes it helps to keep the eyes on the road and listen to the text to speech directions when I am going to the new places