XO controlled 480Hz Oscillator
in [Design]
|
Prev: The UT804 bench multimeter
Next: Small genset
From: Uwe Hercksen on 3 Feb 2010 09:59 Vladimir Vassilevsky schrieb: > ???? Hello, i forgot a factor of 1000.... Bye
From: Jim Thompson on 3 Feb 2010 10:05 On Wed, 3 Feb 2010 06:15:37 -0800 (PST), George Herold <ggherold(a)gmail.com> wrote: >On Feb 2, 11:29�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 > >OK this is probably a stupid idea. But could you phase lock to the >8th harmonic of the 60Hz line frequency? > >George H. AC Line is sort of sinusoidal, so 8th harmonic content is probably not all that wonderful, but a PLL with a DIV8 as feedback should work great... do it all in cheapy CMOS, at low power ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Vladimir Vassilevsky on 3 Feb 2010 10:13 Jim Thompson wrote: > On Wed, 3 Feb 2010 06:15:37 -0800 (PST), George Herold > <ggherold(a)gmail.com> wrote: > > >>On Feb 2, 11:29 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 >> >>OK this is probably a stupid idea. But could you phase lock to the >>8th harmonic of the 60Hz line frequency? >> >>George H. > > > AC Line is sort of sinusoidal, so 8th harmonic content is probably not > all that wonderful, but a PLL with a DIV8 as feedback should work > great... do it all in cheapy CMOS, at low power ;-) AC -> XOR gate -> RC -> XOR gate -> RC -> XOR gate :))))) BTW, I actually used that sort of thing for frequency doubling in one of the projects... VLV
From: Jim Thompson on 3 Feb 2010 10:15 On Wed, 03 Feb 2010 09:13:12 -0600, Vladimir Vassilevsky <nospam(a)nowhere.com> wrote: > > >Jim Thompson wrote: > >> On Wed, 3 Feb 2010 06:15:37 -0800 (PST), George Herold >> <ggherold(a)gmail.com> wrote: >> >> >>>On Feb 2, 11:29 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 >>> >>>OK this is probably a stupid idea. But could you phase lock to the >>>8th harmonic of the 60Hz line frequency? >>> >>>George H. >> >> >> AC Line is sort of sinusoidal, so 8th harmonic content is probably not >> all that wonderful, but a PLL with a DIV8 as feedback should work >> great... do it all in cheapy CMOS, at low power ;-) > >AC -> XOR gate -> RC -> XOR gate -> RC -> XOR gate > >:))))) > >BTW, I actually used that sort of thing for frequency doubling in one >of the projects... > > >VLV Yep. I've done that sort of thing clear up into the GHz range. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Chris on 3 Feb 2010 11:44
On Feb 3, 7:15 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- Site.com> wrote: > On Wed, 03 Feb 2010 09:13:12 -0600, Vladimir Vassilevsky > > > > <nos...(a)nowhere.com> wrote: > > >Jim Thompson wrote: > > >> On Wed, 3 Feb 2010 06:15:37 -0800 (PST), George Herold > >> <ggher...(a)gmail.com> wrote: > > >>>On Feb 2, 11:29 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 > > >>>OK this is probably a stupid idea. But could you phase lock to the > >>>8th harmonic of the 60Hz line frequency? > > >>>George H. > > >> AC Line is sort of sinusoidal, so 8th harmonic content is probably not > >> all that wonderful, but a PLL with a DIV8 as feedback should work > >> great... do it all in cheapy CMOS, at low power ;-) > > >AC -> XOR gate -> RC -> XOR gate -> RC -> XOR gate > > >:))))) > > >BTW, I actually used that sort of thing for frequency doubling in one > >of the projects... > > >VLV > > Yep. I've done that sort of thing clear up into the GHz range. > > ...Jim Thompson > -- > | James E.Thompson, CTO | mens | > | Analog Innovations, Inc. | et | > | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | > | Phoenix, Arizona 85048 Skype: Contacts Only | | > | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | > | E-mail Icon athttp://www.analog-innovations.com| 1962 | > > I love to cook with wine. Sometimes I even put it in the food. I called a local custom crystal manufacturer -- $18 for a 7864320 Hz Crystal. The most straight forward approach looks like the CD4060B. I found a source $3 for a pack of 25. If you look at Fig. 13 in the data sheet for the CD4060B, it shows how to hook the crystal up to the chip. All I need is two caps and two resistors. The crystal manufacturer said that he would give me the values that I need to calculate C1 and C2. I am wondering what value I would need for RC. Thanks, Chris KQ6UP |