XO controlled 480Hz Oscillator
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From: miso on 3 Feb 2010 19:54 On Feb 3, 6:18 am, MooseFET <kensm...(a)rahul.net> wrote: > On Feb 2, 9:46 pm, ehsjr <eh...(a)nospamverizon.net> wrote: > [..3.29136MHz..] > > > divide it by 8192 you'll get the 480 Hz you want. > > The 4060 has an 8192 ouput on Q13. > > I suggest the HC4060 not the CD4060. The HC has a smaller delay so > making a good oscillator a 3.29136MHz is easier with it. > > Follow the app notes My comment about the extra divide by two is null and void if you pick a crystal such that you can use a FF output,i.e. the crystal is some power of two of 480Hz.
From: ehsjr on 3 Feb 2010 22:35 Chris wrote: > 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. Or spend 40 cents for the 3.93216MHz crystal the MooseFET recommended. In stock at Digikey. Use Q13 to divide by 8192. Ed > 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
From: George Herold on 3 Feb 2010 22:43 On Feb 3, 10:05 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My- Web-Site.com> 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 ;-) > > ...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. Yeah, that's what I meant. I've never done a PLL circuit.... But if I can 'restrict' the VCO so that it only 'goes' near 480 Hz, then it should be a simple matter to 'lock-in'. George H.
From: Chris on 4 Feb 2010 00:19 On Feb 3, 7:35 pm, ehsjr <eh...(a)nospamverizon.net> wrote: > Chris wrote: > > 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. > > Or spend 40 cents for the 3.93216MHz crystal the MooseFET > recommended. In stock at Digikey. Use Q13 to divide > by 8192. > > Ed > > > 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 Well, I already ordered the crystal. I will keep that in mind. I need to make a 60Hz VCXO in a PLL slaved to a 24Hz pulse. That is for later though. Regards, Chris Maness
From: JosephKK on 4 Feb 2010 00:44
On Tue, 2 Feb 2010 08:29:47 -0800 (PST), Chris <christopher.maness(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 Too many choices and not enough metrics. What properties do you want in your tone generator? pure sine wave? superclean square wave? frequency accuracy? amplitude stability? low jitter? least component count? most straightforward for a tech to complete the design? all hardware? primarily firmware? least development $? least development hours? Some balance between these properties? |