> From: Andrew Wood <[email protected]>
>
> 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
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