Appy 3.3V to the mic input?? Why?????
?
The KEY? lines (dit/dah) they would not like DC applied to them
as they are input direct to the micro.? ? For SSB I think one is
hooked to the A/D which is ac coupled but a sharp transient
of 3.3V might just hit the input too hard.
?
ITs 2.2K to 2.2V rail so that not? it but the A/D input are nominally
biased to half the Vdd (3.3V).? The mic input is though a .1uf cap.
?
Likely killed the micro.
?
--
Allison
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