Was looking at a remote shutter switch, specifically the Canon RS-60E3,
which has mixed reviews/user comments

Am I right in thinking this is simply a passive two-stage push-button and
a stereo plug ?

If so, I'd rather make my own PIC-based one, with added timer, IR and
other capabilities

Picture

http://www.trademe.co.nz/Electronics-photography/Camera-accessories/Remote-shutters/photos/a-181316682/p-61068812.htm

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