XO controlled 480Hz Oscillator
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From: Chris on 2 Feb 2010 11:29 What is the simplest way to get 480Hz from a crystal controlled oscillator? Looks like most of the pre-packaged XO's and VCXO, seem to put out much higher frequencies. Would a series of dividers be the best way? Thanks, Chris KQ6UP
From: Uwe Hercksen on 2 Feb 2010 11:36 Chris schrieb: > What is the simplest way to get 480Hz from a crystal controlled > oscillator? Looks like most of the pre-packaged XO's and VCXO, seem > to put out much higher frequencies. Would a series of dividers be the > best way? Hello, there are also crystal controlled oszillators together with a pin programmable divider in one small case. Bye
From: Tim Wescott on 2 Feb 2010 11:40 On Tue, 02 Feb 2010 17:36:00 +0100, Uwe Hercksen wrote: > Chris schrieb: > >> What is the simplest way to get 480Hz from a crystal controlled >> oscillator? Looks like most of the pre-packaged XO's and VCXO, seem to >> put out much higher frequencies. Would a series of dividers be the >> best way? > > Hello, > > there are also crystal controlled oszillators together with a pin > programmable divider in one small case. Dunno if one would go down to 480Hz, but if it did it'd be the way to go. -- www.wescottdesign.com
From: Tim Wescott on 2 Feb 2010 11:46 On Tue, 02 Feb 2010 08:29:47 -0800, Chris wrote: > What is the simplest way to get 480Hz from a crystal controlled > oscillator? Looks like most of the pre-packaged XO's and VCXO, seem to > put out much higher frequencies. Would a series of dividers be the best > way? > > Thanks, > Chris KQ6UP 480Hz what? Forever constant frequency square wave? Yes. If you want to vary the frequency you may want to use a programmable divider, and the easiest way to do _that_ may well be to use a small microprocessor, particularly one with a hardware timer. If you want a sine wave you could either divide down to a 480Hz square wave and filter, at the cost of a fairly elaborate analog filter. Or you could use that microprocessor again to generate a 480Hz almost-sine wave to a DAC or PWM, in which case you can use a much less elaborate (and therefor easier to design and cheaper) analog filter. If you can live with a healthy bit of output impedance, you could do this with PIC, a resistor, a cap, and either a crystal and it's capacitors or a crystal oscillator that'll be bigger than the PIC. -- www.wescottdesign.com
From: Chris on 2 Feb 2010 12:02
On Feb 2, 8:29 am, Chris <christopher.man...(a)gmail.com> wrote: > What is the simplest way to get 480Hz from a crystal controlled > oscillator? Looks like most of the pre-packaged XO's and VCXO, seem > to put out much higher frequencies. Would a series of dividers be the > best way? > > Thanks, > Chris KQ6UP Clarification: I only need a digital (read square wave) output. Fairly high voltage swing (12V) into a high Z load. Regards, Chris |