Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!ginosko!uunet!zephyr.ens.tek.com!tekcrl!tekgvs!jans From: jans@tekgvs.LABS.TEK.COM (Jan Steinman) Newsgroups: sci.electronics Subject: Re: A pathetically simple question... Message-ID: <6028@tekgvs.LABS.TEK.COM> Date: 29 Sep 89 21:16:37 GMT Distribution: sci.electronics Organization: Tektronix Inc., Beaverton, Or. Lines: 16 Check out the CMOS 4528 dual mono. These suckers will delay up to *days* with careful parts selection. (your basic 10 Gohm resistor: clean a piece of glass with MEK, draw a thin line of india ink on it... the leads are a problem :-) They're re-triggerable, and lack a lot of the nasty behavior of the infamous 555. Plus, you get two of them in a DIP. For a 10 second delay, try 10 Mohm and 1 uf. Capacitor leakage current will reduce the effective time constant -- use non-electrolytic caps with resistors over half a meg or so. Jan Steinman - N7JDB Electronic Systems Laboratory Box 500, MS 50-370, Beaverton, OR 97077 (w)503/627-5881 (h)503/657-7703