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From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics,rec.radio.swap
Subject: Re: Wanted: Voltage Controlled Oscillators, can type, under $50.
Message-ID: <1991May10.022841.24746@milton.u.washington.edu>
Date: 10 May 91 02:28:41 GMT
References: <1991May09.000310.7621@lynx.CS.ORST.EDU>
Distribution: na
Organization: University of Washington, Seattle
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In article <1991May09.000310.7621@lynx.CS.ORST.EDU> youngqd@jacobs.cs.orst.edu (Dean Youngquist) writes:
>I am looking for manufacturers of Voltage Controlled Crystal Oscillators.
>I have found one, MuRata-Erie, but they charge about $50.00 each.  Now
>I understand that they might be a bit more mo
>counterparts but 50 clams seems a bit steep!  The fixed frequency cans

	Of course, it matters what your frequency range is.  From DC
to about 15 MHz, you can use a 74HC4046 (about $1), or for higher
frequencies a 74S124 (60 MHz) or 74LS321 (70 MHz) should fill
your needs for about $3.  In ECL, the venerable MC1648 will take
you to about 225 MHz.

	These all require a resistor/capacitor pair to set the frequency
range.  The 'HC4046 (like the CD4046 slow-CMOS part it replaces) has
particularly convenient adjustment inputs for both center frequency
and frequency range.  The 'S124 and 'LS321 are duals.

	John Whitmore