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I'm looking for a hall effect generator

it also makes the battery last longer.

Bye. Jasen

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jasen
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PC (dc brushless) fans have hall sensors too.

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Bye.
   Jasen
Reply to
jasen

got

yes thats true, I thought of that after I posted, theyre cheap too.

Colin =^.^=

Reply to
colin

You need to be careful in your choice of reed if you want to minimise current consumption.

Reeds with noble metal contacts can work well as "dry" reeds, but if you aren't picky enough about this you may find that you have to put milliamps of "wetting" current through the contact to keep the contact resistance low and stable. Mercury-wetted reed switches are ideal if you really do want to work with minimal current through the closed contact (as well as being bounce-free and very long-lived), but they aren't cheap and they do have to be mounted within 15 degrees of the vertical (unless you can find an oerientation-insenstive mercury wetted reed - I've seem them advertised from time to time, but the people that try to make them never seem to be able to keep them in production).

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Bill Sloman, Nijmegen
Reply to
bill.sloman 

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Contrary to popular opinion, a "dry" relay contact is one that never
has to switch current, not one that switches current, no matter how
low.

An example would be a relay that\'s energized with no voltage
difference between the contacts and then when the contacts have
settled down, current allowed to traverse the contacts.

Conversely, when the relay is to be de-energized the current through
the contacts is removed before the contacts are allowed to open.

In other words, dry contacts never hot switch.
Reply to
John Fields

This is what is known as prescriptive linguistics - some self-defined expert telling the world what a word "means".

In fact, Humpty-Dumpty was right - a word means what the speaker intends it to mean - and if popular opinion talks about "dry reed relays" with the explicit understanding that such relays can be used to switch very low currents, that becomes a de facto definition of the phrase.

The parts were originally developed for us in telephone exchanges at a time when "true" dry switching wouldn't have been a practical option.

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Bill Sloman, Nijmegen
Reply to
bill.sloman

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