Help with simple circuit

MacGyver · 2005-10-04T01:19:28+00:00

At least I think it is simple...I have 2 12v wingtip lights that I need to be able to control withone switch and one wire running through a wing in an airplane.This is for just one wing. That's the gist of it.I just bought piggyback strobes for the wingtips, but I don't want tohave them on all the time that I have the navigation lights on.I was thinking of a relay that has a remote control, or has a signalrun through the positive wire or could possibly have a low & highsetting and if we send 12 volts to the relay it trips, but it won'ttrip at say 10 volts.Also was thinking about if I turn the switch on once just the lightcomes on. Flip the switch off & on again in under 2 seconds and thelights & strobes come on. Leave the switch off & everything turns off.I was thinking about relays with a capacitor to keep the line live for2 seconds to be able to flip another relay... but now I am confusingmyself again.Any Ideas???Seems like it should not be too difficult.Thanks so much for any advise!!! Sean GallagherPheonix, AZ

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Fred Bloggs 20 years ago

The ruggedized approach uses an SCR latch. The timing components are the

2.2U and 2.2M. If the circuit is switched on when the 2.2U is discharged, T1 is triggered immediately and grounds out the gate of T2 preventing it from triggering. The strobe lamp remains OFF, and the 2.2U charges to the battery voltage. When SW is turned off, T1 turns off and 2.2U discharges very slowly through the 2.2M with a 6 second time constant. If SW is turned on before the 2.2U has discharged to approximately 6V, T1 is prevented from triggering by the zener diode, ZD, and T2 is now allowed to trigger and activate the STROBE lamp. View in a fixed-width font such as Courier.

. . SW >---+------------------------------------------+ . | | . V strobe . - lamp . | | . +----------------[1K]----+----------+ +-----+ . | | | | | . [1K] | | | | . | | | | | . V | | | | . - | | | | . | [100] | | | . +----+ | | | | . + | | | | T2 | | . === [2.2M] | | --- | . 2.2U| | +-[1K]-+---------\\ / | . +----+----[100K]-----+ | | | --- | . | | | | | | | . | ZD |T1 | | | | | . | 6.2V | --- [1K]=== | [100] . +------|

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ehsjr 20 years ago

Set your reader to view the posts with a fixed font, like courier. A couple of solutions have been posted in ascii, so you are missing out if you can't read them.

Ed

It is.

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John Fields 20 years ago

OK, no problem. :-)

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John Fields 20 years ago

I don\'t really like the OFF position being responsible for a long term anything but OFF, so how about this: The switch starts in the OFF position with everything off, then if it\'s moved to ON the nav lights will go on. Then, if it\'s toggled OFF and back ON again in less than one second or so, the nav lights will go off and the strobes will go on. Finally, if it\'s toggled OFF and ON again in less than one second or so, the strobes will stay on and the nav lights will come on. In order to turn off the lights during any part of the sequence, all that\'s necessary is to place the switch to the OFF position and leave it there for a few seconds, at which time eveything will go off and the circuit will return to its quiescent power-down state where it consumes no power.

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RST Engineering (jw) 20 years ago

Yeah, but he gave me an idea for another $500 column, and that made it worthwhile to me at least {;-)

Jim

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Rich Grise 20 years ago

So, do I get any kickback for prompting this $500.00? Please send your check (payable to 'Richard Grise') to: Rich Grise c/o ABI Engineering 12143 Rivera Rd. Whittier, CA 90606

Thanks! Rich

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MacGyver 20 years ago

I would love this!!! As I said before though, I don't have any reason to ever have the Strobe lights on witout the NAV lights, so that can be taken out of the equition. Please post how you would accomplish this. Thanks so much! Sean

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MacGyver 20 years ago

This would certainly work for me, but like I said, we can simplify it even more by ditching the Strobes without Nav position. If you do post a diagram, could you please e-mail me the post too. My browser is not ASCii friendly. Thanks!!!

Sean (OP as you guys refer to me) haha snipped-for-privacy@cox.net

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MacGyver 20 years ago

Would love to read the column! What magazine was it.

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MacGyver 20 years ago

Maybe I'll send ya Photos when it's all done! haha

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John Fields 20 years ago

OK. BTW, when there\'s more than one person in the thread, if you\'d leave a little of the post you\'re replying to in your reply, that would make it a lot easier to figure out what/whom you\'re responding to.

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RST Engineering (jw) 20 years ago

It will be Kitplanes magazine, March '06 issue.

Jim

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Rich Grise 20 years ago

Hey, I've got it! Run the nav lights and strobe simultaneously, all of the time, and shroud them while you're taxiing. Then, when you're at the threshold, set the brake, jump out of the plane, go grab your shrouds, and take them with you. ;-) You could use a couple of recycled pillowcases. ;-)

Cheers! Rich

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John Fields 20 years ago

Schematic posted to abse and emailed to the OP.

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JeffM 20 years ago

MacGyver wrote [without context]:

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Help with simple circuit

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