Hi I'm looking for a circuit which removes dtmf tones and maybe other tonebursts from the rx audio before it is fed to the tx.
There are circuits around which use the MN3008 and MN3101 ics which are both obsolete now so are no choice. One possibility would be to replace them with similar ics from Coolaudio, but most likely these would still be hard to get even though they're still made. Does anybody have a different approach for such a tone blocker? Thanks Martin
