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Battery fed light with fuse and reed switch help

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Joeralph123

New Member
Hello,
I'm trying to install a 12v 20a battery fed L.E.D lighting circuit with around a 1amp fuse? possibly a 1amp resistor aswell for safety? And a normally open reed switch capable of switching 0.7amps DC so maby a 1 or 2amp switching currrent? So it does not burn out quickly when used but I would still like a very low pull sensitivity (AT) as the distance from the magnet would have to be around 20-35mm. So any help would be appreciated helping me find a suitable reed switch, fuse and possibly a resistor?

Thank you
Joe ralph
 

alec_t

Well-Known Member
Most Helpful Member
Welcome to ETO!
I think you'll have a hard time finding a reed switch which will operate that far from the magnet. The most sensitive reed switch (unknown brand) in my junk box needs to be less than ~15mm from the most powerful magnet I've got. Also, reed switches capable of carrying 0.7A are unusual and probably expensive. Have you considered using a Hall Effect sensor with a relay or power semiconductor device?
Don't know what you mean by a '1A resistor'.
 

Joeralph123

New Member
Oh ok and does a Hall effect sensor have a parasitic effect on the battery? And I ment a voltage regulator of some sort? As I was worried about the reed switch sparking and deteriorating, I don't no much about Hall effect sensors so will have a butchers now thank you :D and I have no idea what a power semi conductor device is XD sorry I'm very much a newby at this
 

alec_t

Well-Known Member
Most Helpful Member
The AT rating is the Ampere-turns needed for powering a coil surrounding the reed-switch. How that relates to the maximum operating distance using an unspecified magnet is anybody's guess.
 

Tony Stewart

Well-Known Member
Most Helpful Member
This exceeds the current rating if any Reed switch. and magnetic field at that distance is too weak to excite any reed.

Try again . but forget reed switches.
 

alec_t

Well-Known Member
Most Helpful Member

dr pepper

Well-Known Member
Most Helpful Member
You might get that to work, I've had decent range from a reed switch with a old microwave magnet, a good size neo magnet ought to give you 20mm without much trouble, you'd have to get some and try it.
 
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