Alt-BEAM Archive
Message #00865
To: Beam beam@corp.sgi.com
From: "Sathe Dilip" sathe_dilip@bah.com
Date: Tue, 23 Feb 1999 15:59:21 -0500
Subject: [alt-beam] Re: crystal chip
(Sorry if you receive multiple copies of my response. I have tried
twice before. Received error once & the second time also has not
shown up in >3 hours.)
Ben Hitchcock wrote:
>
> To make a crystal-locked oscillator: connect a crystal between the input
> and an output of one gate of a 74HC14 chip. Then use the output pin as your
> clock frequency.
>
> You can't get much simpler than that! One inverter, and one crystal! And
> you have 5 inverters left over!
>
> Ben
That may be true but I have not seen a crystal with a frequency lesser
than 10 kHz. The easier to find in junk (and common) are probably the
36 KHz crystals from wristwatches etc. and still others are in the MHz
range. To make them usable in the a bot for control (timing), one will
have to use divider chains needing additional chips.
Dilip
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