[sdiy] Ensoniq patent, was: distance meter for keyboard, was: Where to get special white keys?

[Tom Wiltshire]

On 2 Mar 2009, at 02:17, Ian Fritz wrote:

> At 06:42 PM 3/1/2009, Kyle Stephens wrote:
>
>> You can get Hall sensors for $0.50/a pop here, and at $0.45 for 100 
>> + quantities:
>>
>> http://www.allelectronics.com/make-a-store/item/SS-19T/HALL-EFFECT- 
>> MAGNETIC-POSITION-SENSOR/-/1.html
>
> Those are switches.  You need *linear* Hall sensors.

Are you sure? The linked datasheet shows a linear transfer graph and  
says "Analog devices are designed to produce an output voltage  
proportional to the intensity of the magnetic field to which they are  
exposed".

Looks like those could be ok to me.

T.