This is a multi-part message in MIME format. --Boundary_(ID_QzyPmAOYluCpo8qhatCwhg) Content-type: text/plain; charset=us-ascii; format=flowed Content-transfer-encoding: 7BIT Larry Bradley wrote: > I'm intending to build a digital tach for my sailboat, which has an > ancient > old gas engine in it. I've built analog tachs before, using a 555 > driving a > meter. The problem is a decent filter and protection circuit for the > input > from the points to the PIC. Has anyone else done this for a PIC > before, and > can point me to a circuit? My engine is a hundred miles away, so I can't > easily experiment right now. > I used to use this circuit. regards Tony -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! 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