The MOSFET used in the K3 is internally diode protected.
73,
Tom N0SS
At 16:40 09/01/2008, David Robertson wrote:
Hank
The K3 Key out may be rated for 200 volts but if you use it with an
unmodified SB220 you are taking a real chance of damaging the K3
because there is no protection diode in the SB220 and the field
collapse voltage can exceed 1000 volts.
the SB220 was originally designed for relay keying.
73
Dave KD1NA
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