I am considering powering the "door unlatched" warning annunciator through
diodes so that it is enabled if either the fuel pump OR the strobe light has
power applied AND either door is unlatched. This should ensure that the
warning is active prior to takeoff while avoiding annoyance on the ground. Is
this reasonable? And given this arrangement, would it be wise to add a
warning horn also?
My annunciator LEDs are on a small perf board to be mounted on the horizontal
section above the gear handle; the LEDs are in a line above this handle so
that they mount directly on the perf board. Has anyone used CMOS logic
mounted on a board like this within the panel but without a metal case? I
have some ideas for simple logic circuits to drive annunciators but don't want
to get bogged down with problems due to RF pickup.
John A044 Newtown, CT
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