actully, the Hall effect, has 2 have a refrence voltage going to it, the shudders and crystal, inturupts the signal compleatly. so it's on off, bianary, square wave, digital signal. it's not digital itself, but that's the signal it sends. these are getting widely used, because a computer can read the digital output signal, where as, with a magnetic pickup, an A/D converter would need to be used, old Chrysler ign box's used a couple diodes, for an A/D converter. I'd take a hall effect, over a magnetic pickup, any day, because they are so accurate ( this is why there used as ckp's ), for a distributor, you might only need 8 shudders ( 8cyl ) but, add in 180 shudders, put the sensor on the crankshaft, and you got 100% crankshaft position.
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Took the words right outta my mouth.


Don