Thanks Mike, However I think that the op amp approach is more elegant and probably cheaper to implement.
Ivan. ----- Original Message ----- From: "Michael Leavitt" <[email protected]> To: <[email protected]> Sent: Thursday, 27 July 2000 12:50 Subject: Re: CS>Away too long > How about installing a potentiometer in series with the relay coil to vary > the available voltage, i.e. the point it would drop out. Take reading of PPM > and calibrate the scale of the knob on the pot. > > Mike > > Ivan Anderson wrote: > > > Maybe a voltage (or current) comparator opamp with a fet switch? > > If any one nuts one out, please let me know. > > > > Ivan. > > > > ----- Original Message ----- > > From: "Robert L. Berger" <[email protected]> > > To: <[email protected]> > > Sent: Sunday, 16 July 2000 06:14 > > Subject: Re: CS>Away too long > > > > > Hi Erwin; > > > > > > I haven't found out how to program a relay with a selectable window > > for shut-off. > > > > > > Given me a schematic and I will paly with it. > > > > > > No doctor just a crotchy old guy' > > > > > > "Ole Bob" > > > > -- > > The silver-list is a moderated forum for discussion of colloidal silver. > > > > To join or quit silver-list or silver-digest send an e-mail message to: > > [email protected] -or- [email protected] > > with the word subscribe or unsubscribe in the SUBJECT line. > > > > To post, address your message to: [email protected] > > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > > List maintainer: Mike Devour <[email protected]> >
