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#11
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13 VDC switch
What do you want the cutoff voltage to be? Personally, I'd pick 13.0 volts,
but it is child's play to do any voltage you want. There will be about a milliampere of quiescent current for the sensor that will still be on-line when the output shuts off. Jim "abripl" wrote in message ups.com... You mean I started a new idea? It sure would be handy to plug in portable devices into the cigarette lighter socket source and not drain the battery with engine off. OR in case of charging system failure some non-crucial devices could be turned off automatically. We need this before November. RST Engineering wrote: This is starting to smell very much like the upcoming November Kitplanes column. Jim |
#12
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13 VDC switch
"RST Engineering" wrote in message
... What do you want the cutoff voltage to be? Personally, I'd pick 13.0 volts, but it is child's play to do any voltage you want. There will be about a milliampere of quiescent current for the sensor that will still be on-line when the output shuts off. Jim One-chip solutions designed for this purpose that can detect both undervoltage and overvoltage are available from several vendors, such as Maxim. Example: http://pdfserv.maxim-ic.com/en/ds/MAX6457-MAX6460.pdf These offer very low quiescent current when off (couple of uA). The output can be used to activate a relay (maybe needs an extra transistor). I think you can request free samples. Rob |
#13
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13 VDC switch
A. Maxim is very poor on production delivery.
B. Joe Sixpack in East Undershirt Ohio can't go down to the corner Maxim store and buy onesie-twosies on Sunday afternoon. C. One milliampere out of a 25 amp-hour battery will run the battery down in 25,000 hours (1040 days, or a little less than 3 years). If you don't fly your airplane but once in 3 years, that's not my problem. D. Why would you use an unreliable electromechanical device like a relay when a FET is half the price and a thousand times more reliable? Jim "Rob Turk" wrote in message news:Y7_gg.1536$YI3.268@amstwist00... "RST Engineering" wrote in message ... What do you want the cutoff voltage to be? Personally, I'd pick 13.0 volts, but it is child's play to do any voltage you want. There will be about a milliampere of quiescent current for the sensor that will still be on-line when the output shuts off. Jim One-chip solutions designed for this purpose that can detect both undervoltage and overvoltage are available from several vendors, such as Maxim. Example: http://pdfserv.maxim-ic.com/en/ds/MAX6457-MAX6460.pdf These offer very low quiescent current when off (couple of uA). The output can be used to activate a relay (maybe needs an extra transistor). I think you can request free samples. Rob |
#14
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13 VDC switch
abripl a écrit :
Looking for a ready made 13VDC electronic switch, that switches a circuit on when voltage reaches 13+VDC - or a simple circuit. It would be for optional devices I want to go on when the engine is charging and off when not charging. Any sources? Not sure what to Google for. ----------------------------------------------------------------- SQ2000 canard: http://www.abri.com/sq2000 Hi abripl, You'll find what you're looking for there : http://www.periheliondesign.com/lvwaabm.htm Or there http://www.aeroelectric.com/Catalog/AEC/9005/9005.html Works great with our airplane. Regards, Gilles Thesee Grenoble, France http://contrails.free.fr |
#15
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13 VDC switch
Yeah,
13V cuttoff sounds right. Most charging systems go to at least 13.5 volts and batteries seldom settle near 13 when not charging. 1 ma is fine. FET? is that what it takes? Its gota work for low and high loads same... RST Engineering wrote: What do you want the cutoff voltage to be? Personally, I'd pick 13.0 volts, but it is child's play to do any voltage you want. There will be about a milliampere of quiescent current for the sensor that will still be on-line when the output shuts off. Jim |
#17
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13 VDC switch
..
"abripl" wrote in message ups.com... You mean I started a new idea? It sure would be handy to plug in portable devices into the cigarette lighter socket source and not drain the battery with engine off. OR in case of charging system failure some non-crucial devices could be turned off automatically. We need this before November. Ok, I'm operating from memory, but if the objective is to turn "on" only when the alternator is active, trigger your switch with the stator output - should be 0 when the alterntor is inactive, and about 1/2 the output voltage when the alternator is charging. A 6 volt relay would do the job, eh? -- Geoff The Sea Hawk at Wow Way d0t Com remove spaces and make the obvious substitutions to reply by mail When immigration is outlawed, only outlaws will immigrate |
#18
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13 VDC switch
Others can do what they want. Personally I want a finished "plug-in,
easy to use" product and not a lifetime hobby of playing with alternator circuits, or whatever. Capt. Geoffrey Thorpe wrote: . Ok, I'm operating from memory, but if the objective is to turn "on" only when the alternator is active, trigger your switch with the stator output - should be 0 when the alterntor is inactive, and about 1/2 the output voltage when the alternator is charging. A 6 volt relay would do the job, eh? -- Geoff The Sea Hawk at Wow Way d0t Com remove spaces and make the obvious substitutions to reply by mail When immigration is outlawed, only outlaws will immigrate |
#19
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13 VDC switch
"RST Engineering" wrote in message
... A. Maxim is very poor on production delivery. That's not been my experience, but maybe I've just been lucky. Also, when they offer samples then the chips are available at least in sample quantities. That may not mean much if you want to order 100.000 of them, but for us one-off builders this is fine. Besides, Maxim was just one example. Linear Technologies has similar chips and similar sample programs. B. Joe Sixpack in East Undershirt Ohio can't go down to the corner Maxim store and buy onesie-twosies on Sunday afternoon. The samples ship worldwide. If I can get them easily in Hoevelaken, The Netherlands, Europe then I'm sure they'll ship to East Undershirt Ohio as well. C. One milliampere out of a 25 amp-hour battery will run the battery down in 25,000 hours (1040 days, or a little less than 3 years). If you don't fly your airplane but once in 3 years, that's not my problem. Agree, and if you leave your plane for 3 years without flying I'm sure there will be other issues to worry about.. D. Why would you use an unreliable electromechanical device like a relay when a FET is half the price and a thousand times more reliable? Agree again, it's whatever makes you feel happy. I've had luck with either device. Automotive relays seem pretty reliable, and so are FET's. Jim Rob |
#20
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13 VDC switch
"jmk" wrote in message
oups.com... I believe it was "Interesting proof." I remember it as being 'trivial'. I have always looked with skepticism on anything called trivial ever since. And didn't someone finally work it back out a couple of years ago? Probably. I've been away from math class for many years now. |
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