Schematic for a bench-microphone to test-tone with PTT switch-box

For anyone wishing to build a simplified DIY "microphone / tone / PTT" testing box / set-up., here's a hopefully understandably drawn schematic of one I generated quite a while back at the request of some customers who wanted to "try their hand" at such things...
I mean., all that one can do, is to try.! :-)
If anyone has any questions (within reason of course.!) feel free to ask.
PS: The one I use / built, has a small built-in 200mw audio amp and 1-inch speaker (only for "tone-operation"), but would've made the schematic a bit more "long-winded" for most DIY'ers...
Regards,
Eric Klein
Klein Communications
radioman55
Also as KY8E
www.qrz.com/db/KY8E

[@ericklein4282]

For anyone wishing to build a simplified DIY "microphone / tone / PTT" testing box / set-up., here's a hopefully understandably drawn schematic of one I generated quite a while back at the request of some customers who wanted to "try their hand" at such things...
I mean., all that one can do, is to try.! :-)
If anyone has any questions (within reason of course.!) feel free to ask.
PS: The one I use / built, has a small built-in 200mw audio amp and 1-inch speaker (only for "tone-operation"), but would've made the schematic a bit more "long-winded" for most DIY'ers...
Regards,
Eric Klein
Klein Communications
facebook.com/radioman55
Also as KY8E
www.qrz.com/db/KY8E