On Tue, 18 Jun 2002, Jinx wrote:

>> Since I'm not an EE, nor do I even pretend to be, a few questions
>> do spring to mind (boing!). Is the torroid that they are talking about
>> used to "focus" or "enhance" the already present magnetic field,
>> thereby making it easier to sense using the hall effect sensor?
>> And why does there need to be wire wrapped around the torroid?
>
>The sensors have optimum gauss ranges and some twiddling
>with the magnetic field may be needed. In some cases this means
>adding a concentrator such as a block of iron, in other cases it
>means stepping-down by a transformer such as a wound ferrite.
>The main aim is to optimise the field strength range for the sensor
>
>I've not used the linear UGN devices so can't comment on them
>as ammeter sensors. The only uses I've ever had for them have
>been as detectors and switches

Do you happen to know if Allegro used a mild steel lead frame or a copper
one on their sensors ?

Peter

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