Quote:
Originally Posted by BruceMe
I believe I've fixed this. It's now a pull-down configuration. I need to test the power sense voltage divider and at that OFF will actually trigger the cascading shutdown, but I think this is it (see the origonal post, it automatically pulls the latest version)
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Your new circuit switches the low side of the solenoid now, but you're still routing an unfused positive wire from the battery to your master pushbutton switch, which is the main thing a standard master switch circuit is trying to avoid.
Would you put a fuse on the power line going to your circuit? If so, it looks like a blown fuse will cause the master solenoid to shut off. A standard master switch circuit is designed to safely avoid putting fuses in the circuit, and also fail in the on state if the one wire going to the switch shorts to anything on the airframe.
Quote:
Originally Posted by BruceMe
And it's never after a flight that I leave the master on... it's after working on it.
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Then maybe it would be safer to leave the normal master switch alone, and optimize your circuit to be used only for maintenance purposes.