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  #31  
Old 05-25-2017, 05:25 PM
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zilik zilik is offline
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Quote:
Originally Posted by rv8ch View Post
I always leave my strobes on - can't miss those when I forget the master.
Ditto! Never left me with a dead battery
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  #32  
Old 05-25-2017, 11:23 PM
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Originally Posted by GeraldC View Post
Your circuit operates on the positive side of the master relay...
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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  #33  
Old 05-26-2017, 01:54 PM
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Quote:
Originally Posted by FasGlas View Post
Or you could just put a pressure switch under your seat (like cars have for seatbelts), connect it to the master power and a piezo horn. As soon as to get out and the master is still on the horn blows... I'm not sure I would trust the only source for aircraft power on a handful of sensitive electronic parts. IMHO.
Or, as soon as you hit some moderate turbulence that lifts you up off the seat a touch...doesn't sound like a good idea.

I do it the old-fashioned way. A CHECKLIST. Yes, you have to actually use it.
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  #34  
Old 05-26-2017, 02:10 PM
GeraldC GeraldC is offline
 
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Quote:
Originally Posted by BruceMe View Post
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)
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 View Post
And it's never after a flight that I leave the master on... it's after working on it.
Then maybe it would be safer to leave the normal master switch alone, and optimize your circuit to be used only for maintenance purposes.
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