youngqd@jacobs.cs.orst.edu (Dean Youngquist) (05/09/91)
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 money than their fixed frequency counterparts but 50 clams seems a bit steep! The fixed frequency cans used in computers are about $5 to $10 are'nt they? Therefore I am looking for other sources. Any leads welcome. ------------------------------------------------------------------------- | ...Any resemblance between the above views and those of my college, | | my terminal, or the view out of my window are purely coincidental. | | Any resemblance between the above and my own view is nondeterministic.| | The question of the existance of views in the absence of anyone to | | hold them is left as an exercise for the reader. The question of the | | existance of the reader is left as an exercise for the second god | | coefficient. ( A discussion of non-orthogonal, non-integral polytheism| | is beyond the scope of this article ). | | | | Dean Youngquist - youngqd@jacobs.cs.orst.edu | -------------------------------------------------------------------------
whit@milton.u.washington.edu (John Whitmore) (05/10/91)
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
dana@locus.com (Dana H. Myers) (05/11/91)
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 *