> -----Original Message-----
> From: Chris Loiacono [SMTP:chris@MAIL2ASI.COM]
> Sent: Friday, November 01, 2002 3:33 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: Getting signal safely from fuel injector
>
> And why ever would you want to avoid optical isolation in this
> application,
> unless you don't want it to last forever?
>
As the millions of tachometers fitted to cars all over the world will
testify, it's not that difficult to interface a noisy, spiky high voltage
signal to a precision low voltage circuit and have it last.  An
opto-isolator is a nice simple method of level shifting and clamping in this
instance, but a simple RC network with a clamping diode will work perfectly
well.

Mike

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body