Saw this little gem, though I think they goofed it.
Perhaps it should have been
(741) - 555 - 7805
Or,
324 - 5532
Saw this little gem, though I think they goofed it.
Perhaps it should have been
(741) - 555 - 7805
Or,
324 - 5532
Perhaps I'll have a go at a jellybean DTMF dialer
There are also dozens of application specific ICs like the HT9200
That's wonderful! $200 dollars for a clock divider 
https://explodingthephone.com/docs/dbx0874.pdf
My widget won't generate any of the magical control tones
