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jskiba(at)icosa.net
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 Posted: Thu Jan 11, 2018 11:39 am Post subject: Need a device to send 12volts when all 3 green lights are li |
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Below is the landing gear circuit, I need a device or build one that can use the 12volts coming from the gear down and locked switches and only send 12 volts to another device[for testing a led] IF ALL 3 lights (gear down and locked)
I thought use 3 NPN transistors in series but it seems on my test, if I supply 12 volts to the base of the npn it still lights the led (leak though ?) with no voltage on anything else
I am using figure two of these examples
http://www.rason.org/Projects/transwit/transwit.htm
[img]cid:image002.png(at)01D38AE1.28EBC0D0[/img]
IDEAS ?
[img]cid:image001.png(at)01D38AB2.2D717B60[/img]
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