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- Newsgroups: sci.electronics
- Path: sparky!uunet!gatech!asuvax!ennews!mcdphx!schuch
- From: schuch@phx.mcd.mot.com (John Schuch)
- Subject: Re: How would you detect lack of a square wave?
- Message-ID: <1993Jan3.225717.10578@phx.mcd.mot.com>
- Sender: news@phx.mcd.mot.com
- Nntp-Posting-Host: bopper2.phx.mcd.mot.com
- Organization: Motorola Computer Group, Tempe, Az.
- References: <1993Jan2.172332.21070@socrates.umd.edu>
- Date: Sun, 3 Jan 1993 22:57:17 GMT
- Lines: 21
-
- In article <1993Jan2.172332.21070@socrates.umd.edu> jimbo@socrates.umd.edu (Jim Bogard) writes:
- >What's the best way to detect the presence/lack of a square wave?
-
- Go to RadioShack and pickup their little 555 timer cookbook. There is
- an example missing pulse detector circuit. In essense, the square wave
- continuously resets the timer before it has time to trigger. If the
- pulse train stopps, the timer times out and trips.
-
- John
-
-
- +--------------------------------------------------------------------------+
- | John R. Schuch - Motorola Computer Group - Manufacturing Engineering |
- | N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
- +--------------------------------------------------------------------------+
-
- --
- +--------------------------------------------------------------------------+
- | John R. Schuch - Motorola Computer Group - Manufacturing Engineering |
- | N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
- +--------------------------------------------------------------------------+
-