| Steve R 2007-02-11, 9:25 am |
| I have been looking into the solid state triggers as I need to
fabricate an ignition pickup for an electronic ignition system
(triggered 4 times per revolution from cranking speed up to 6000rpm).
As far as I can tell there are two main types of trigger, one depends
on a magnet going past, and another has a magnet in it and relies on a
lump of steel/iron going past to cause a pulse (I think this type is
called inductive). Some are powered, some just have a coil to give a
pulse, and one I have seen has a coil and a powered op-amp chip on
board.
I think the Hall Effect ones give a fixed voltage pulse, whereas the
coil type give a bigger and bigger voltage the faster they are
triggered. Is this correct ?
For ignition I need something fast switching, weatherproof, and
ideally triggered by metals rather than magnets - so I was thinking of
an ABS sensor from the scrapyard. I don't know if these are Hall
effect or not, but they must have the magnet inside. Anyone know ?
Am I on the right track with this, as I haven't found any useful web
pages explaining this lot ? I have found I can buy a crank trigger
assembly for $300 (http://www.msdignition.com/mag_2.htm) - but thats a
lot of beer money !
Steve
|