Hello, im trying to make a side tone circuit for my pixie. I have found one that seems to be used with the pixie but cant seem to get it to work only hearing a click on keydown.
Anyway i have found another sidetone circuit below using NE567. I can't find this listed in any of the places i normally get components so i want to know if anyone knows an alternative to this chip?
I dont know which country this design is from so im not sure if the number of the chip will change throughout different countries.http://www.qrp4u.de/docs/en/sidetone/index.htm