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From: dana@locus.com (Dana H. Myers)
Newsgroups: sci.electronics,rec.radio.swap
Subject: Re: Wanted: Voltage Controlled Oscillators, can type, under $50.
Message-ID: <1991May10.192803.2805503@locus.com>
Date: 10 May 91 19:28:03 GMT
References: <1991May09.000310.7621@lynx.CS.ORST.EDU> <1991May10.022841.24746@milton.u.washington.edu>
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Organization: Locus Computing Corporation, Inglewood, CA
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In article <1991May10.022841.24746@milton.u.washington.edu> whit@milton.u.washington.edu (John Whitmore) writes:
>
>	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.

  Not really. The MC1648 oscillator uses an LC tank to set the frequency.
Voltage control is accomplished with external voltage-variable capacitance
diodes.

Dana

-- 
 * Dana H. Myers KK6JQ 		| Views expressed here are	*
 * (213) 337-5136 		| mine and do not necessarily	*
 * dana@locus.com		| reflect those of my employer	*