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jon(at)finleyweb.net
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 Posted: Mon Dec 08, 2008 2:32 pm Post subject: AeroElectric-List: Need for start-up protection? |
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Nice post Earnest, I totally agree. The responses to Sam's question have been disappointing.
I am NOT an electrical wiz. That said, I think you are in need of a Transorb or TVS (Transient voltage Suppressor) Sam (or maybe Eric's Snap-Jacks??). The purpose of these little guys is to protect devices from overvoltage conditions by clamping the voltage at some set point. They are placed between the device and power supply. I'm not good one to recommend part numbers but there are lots of possibilities at Digi-Key.
My goal in using these in my plane was not to allow me to leave the power switch on all the time. Rather, I wanted to avoid frying some peice of equipment when the day comes that I accidentally start/shutdown with something on.
Jon
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jon(at)finleyweb.net
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| Posted: Tue Dec 09, 2008 6:37 am Post subject: AeroElectric-List: Need for start-up protection? |
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Ok, then what is the answer? I am one of the folks that just can't understand why this is not a problem in cars but is in aircraft. Does a car have a relay that disconnects all electronics during engine start or are the components better designed or ???
Jon
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Wed Dec 10, 2008 8:28 am Post subject: Re: AeroElectric-List: Need for start-up protection? |
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Your automobile doesn't require some "special" technique to get everything going. This is the classic "accident waiting to happen".
The Air Force did a study of airmen where they turned on a red/green indicator light and the airman had to push a button in response to the green light. In about three cases per-thousand, the very best airmen either didn't push the button when the green light turned on, or pushed the button when the red light turned on. This seems to be the performance limit of for the best human brains.
So if you have to turn off the avionics before starting. You'll screw it up 0.3 percent of the time. This can be expensive, and unnecessary.
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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