🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Article View: sci.electronics
Article #5968

Re: EVENT COUNTER

#5968
From: David Lesher
Date: Sat, 01 Sep 1990 13:33
21 lines
1615 bytes
[needed debouncing, if I understood correctly]

I built some special IO boards for a DEC Falcon {a micro-PDP-11 beast}
that had to debounce switch inputs. I used a 16 pin dip hex debouncer.
I *think* it was a 14490, or 14409, but it's been a while;-}

In any case, its law was simple: For the output to go up, the input had
to go up and stay up for 5 periods. To then go low again, it had to go
low and stay low, etc. You set the period of the internal clock with a
cap I recall. There was WIDE variation in periods available -- maybe
large us to several seconds.

It worked well for me on several hundred boards with 8 per board. But I
should mention that another designer cursed it roundly, as he never had
any luck with it.
-- 
A host is a host from coast to coast.....wb8foz@mthvax.cs.miami.edu 
& no one will talk to a host that's close............(305) 255-RTFM
Unless the host (that isn't close)......................pob 570-335
is busy, hung or dead....................................33257-0335
Technical Details
Message-ID: <1990Sep1.133327.12909@mthvax.cs.miami.edu>
Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!asuvax!ncar!umigw!mthvax!wb8foz
References: <26dd5749-39csci.electronics@vpnet.chi.il.us> <26de96e2-39c.1sci.el <26ded58a-39c.2sci.electronics-1@vpnet.chi.il.us>

Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!asuvax!ncar!umigw!mthvax!wb8foz
From: wb8foz@mthvax.cs.miami.edu (David Lesher)
Newsgroups: sci.electronics
Subject: Re: EVENT COUNTER
Keywords: counters,data aquisition
Message-ID: <1990Sep1.133327.12909@mthvax.cs.miami.edu>
Date: 1 Sep 90 13:33:27 GMT
References: <26dd5749-39csci.electronics@vpnet.chi.il.us> <26de96e2-39c.1sci.el <26ded58a-39c.2sci.electronics-1@vpnet.chi.il.us>
Reply-To: wb8foz@mthvax.cs.miami.edu (David Lesher)
Organization: NRK Clinic for habitual NetNews abusers
Lines: 21