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rparigor(at)SUFFOLK.LIB.N
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 Posted: Fri Mar 17, 2006 9:57 pm Post subject: Landing Light Circuit? |
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I read a post a while back about using an inductor in Bobs Landing Light
circuit.
Do you have a link to that circuit?
Thx.
Ron Parigoris
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Sun Mar 19, 2006 5:46 am Post subject: Re: Landing Light Circuit? |
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Hi Ron,
I can categorically state that an inductor of any use in a landing light circuit would weigh more than a watermellon. I think you are looking for an NTC thermistor to limit inrush current.
These are little quarter-size parts that have a higher resistance when cold and a lower resistance when hot. Most thermistor makers have these. Digikey has p/n KC022L. When cold the part is 0.7 ohms and when hot it is 0.02 ohms (1/35th as resistive). This lowers the filament thermal shock considerably.
It is important to realize that the part runs HOT. Make no attempt to cool it off. It wants to be mounted in still air, probably on the back of the lamp itself.
The "keep-alive" lamp current technique uses power that could be better used elsewhere, but this is a personal choice. It is easy to make a soft-start switch in solid state too.
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
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