Maybe you can key a TIP31 or 32 Power transistor from output of K2 circuit. These worked pretty well for me back in VIC20/RTTY days for keying FT101E.
Paul WD8OJL
"The FL-2100B pulls 20v on its keying input, whilst the circuit for the K2 is
only designed for 5-12v !! This is clearly written on the instructions with
the circuit, which I neglected to read.
Does anyone have details of a simple circuit I can build, so I can use this
with my FL-2100B ??"
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