Re: [EVDL] Reed switch source

[Jan Steinman via EV]

> From: Andrew Wood 
> 
> Does anyone know where its possible to buy reed switches of large size 
> i.e where the glass tube is about the diameter of a finger?

Why would you ever need reed switches of such a size?

> Contact rating only needs to be low voltage/current.

All reed switches that I know of have limited E/I/P ratings. If you need more 
than about ten watts or half an amp or 100 volts, you have to drive a relay 
with the reed switch.

> Also some largeish diameter coils they could be placed in to operate them?

Again, what's with the desire for "large?"

That said, my go-to source for reed switches is Electronic Goldmine:
https://www.goldmine-elec-products.com/prodinfo.asp?number=G19684

I have some of these, and they're the biggest reeds I've ever seen, but they're 
still only about a third of the diameter of your pinkie.

You might find Hall Effect devices could be better for your application. They 
are much more sensitive than reed switches, and you could stick one in a 
finger-sized package, and still drive it with smallish magnets.

For a "largish diameter" coil, you might try a solenoid with a removable 
plunger.
https://www.goldmine-elec-products.com/prodinfo.asp?number=G23209

Or if you use a Hall Effect sensor, a few turns of wire around it should 
suffice. 8 milliteslas trip:
https://www.goldmine-elec-products.com/prodinfo.asp?number=G23888

 To gain the wisdom to survive the dual crisis of peak oil and climate 
change, we may have to abandon our media habit -- not just TV but also 
electronic games and entertainment. All teach consumption, competition and 
violence and tend to make us think along lines that support a corporate 
consumer agenda. -- Pat Murphy  
 Jan Steinman, EcoReality Co-op 

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Re: [EVDL] Reed switch source

[Lee Hart via EV]

Andrew Wood asked:

Does anyone know where its possible to buy reed switches of large size
i.e where the glass tube is about the diameter of a finger? Contact
rating only needs to be low voltage/current.

Also some largeish diameter coils they could be placed in to operate them?


I've never seen a reed that large. If it was, it would be able to switch 
10s of amps. It was cheaper to use conventional relays for such 
currents, so I don't think anyone made them.


Is this for a demo? If so, you could build one yourself in a test tube, 
with a couple pieces of flat spring steel at each end. Holding a magnet 
or electromagnet near it will make them attract each other and touch.


Lee Hart
--
Ring the bells that still can ring
Forget your perfect offering
There is a crack in everything
That's how the light gets in.
-- Leonard Cohen, from "Anthem"
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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Re: [EVDL] Reed switch source

[jim--- via EV]

Andrew Wood asked:
> Does anyone know where its possible to buy reed switches of large size 
> i.e where the glass tube is about the diameter of a finger? Contact 
> rating only needs to be low voltage/current.

> Also some largeish diameter coils they could be placed in to operate them?


One of these:
https://www.digikey.com
https://www.mouser.com

If they exist, one or both of these will have them.  Although I have never seen 
a reed relay that large.

Jim Walls



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