XO controlled 480Hz Oscillator
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From: ehsjr on 5 Feb 2010 23:28 John Fields wrote: > On Wed, 03 Feb 2010 22:35:43 -0500, ehsjr <ehsjr(a)nospamverizon.net> > wrote: > > >>Use Q13 to divide by 8192. > > > Qn DIV BY > -----|--------- > Q0 2 > Q1 4 > Q2 8 > Q3 16 > Q4 32 > Q5 64 > Q6 128 > Q7 256 > Q8 512 > Q9 1024 > Q10 2048 > Q11 4096 > Q12 8192 > Q13 16384 > > :-) > > > JF Thanks, John. The pain in the butt is that different datasheets have different designations. The one from TI that Chris posted goes to Q14. Your post is great, because it brought that to light. I didn't know that, :-( until I saw your post :-) Ed
From: Chris on 5 Feb 2010 23:32 On Feb 5, 6:15 pm, Glenn Gundlach <stratu...(a)yahoo.com> wrote: > On Feb 2, 8:29 am, Chris <christopher.man...(a)gmail.com> wrote: > > What is the simplest way to get480Hzfrom 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 > > You in North America? PLL the 60Hz power supply up to 480 hz. It will > be spot on for frequency. > > G² Yes, I am in North America. I need the deck to be portable, so working off of mains is not usually going to be an option. The capstan motor does run on 60Hz 120VAC, but I would only be able to shoot footage where I have mains. The crystal/fork is for the inverter as the tape transport is run by a sync motor with a sprocketed capstan (the tape is perforated). Regards, Chris Maness
From: Michael A. Terrell on 6 Feb 2010 01:06 Chris wrote: > > On Feb 5, 6:15 pm, Glenn Gundlach <stratu...(a)yahoo.com> wrote: > > On Feb 2, 8:29 am, Chris <christopher.man...(a)gmail.com> wrote: > > > What is the simplest way to get480Hzfrom 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 > > > > You in North America? PLL the 60Hz power supply up to 480 hz. It will > > be spot on for frequency. > > > > G� > > Yes, I am in North America. I need the deck to be portable, so > working off of mains is not usually going to be an option. The > capstan motor does run on 60Hz 120VAC, but I would only be able to > shoot footage where I have mains. The crystal/fork is for the > inverter as the tape transport is run by a sync motor with a > sprocketed capstan (the tape is perforated). Digikey has 60 KHz crystals. Divide by 5 three times, then by 2 for your 480 Hz. Or just divide by 1000 and low pass filter it before amplfing it to drive the 60Hz motor. -- Greed is the root of all eBay.
From: John Fields on 6 Feb 2010 15:10 On Fri, 05 Feb 2010 22:13:58 -0500, Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: >On Fri, 05 Feb 2010 17:48:45 -0800, the renowned >"JosephKK"<quiettechblue(a)yahoo.com> wrote: > >>On Fri, 05 Feb 2010 12:18:06 -0600, John Fields <jfields(a)austininstruments.com> wrote: >> >>>On Wed, 03 Feb 2010 22:35:43 -0500, ehsjr <ehsjr(a)nospamverizon.net> >>>wrote: >>> >>>>Use Q13 to divide by 8192. >>> >>> Qn DIV BY >>>-----|--------- >>> Q0 2 >>> Q1 4 >>> Q2 8 >>> Q3 16 >>> Q4 32 >>> Q5 64 >>> Q6 128 >>> Q7 256 >>> Q8 512 >>> Q9 1024 >>> Q10 2048 >>> Q11 4096 >>> Q12 8192 >>> Q13 16384 >>> >>> :-) >>> >>> >>>JF >> >>I suspect that some datasheets list the outputs as Q1 through Q14. > > Function of pin #3 >Fairchild Q14 >NXP Q13 >ON Q14 >ST Q14 >TI QN --- I suspect you're right. I got my data from the Philips 1996 CMOS data book, but going back to the RCA bible, it's listed as Q14. Thanks for the reality check. :-) JF
From: Chris on 6 Feb 2010 22:03
On Feb 5, 10:06 pm, "Michael A. Terrell" <mike.terr...(a)earthlink.net> wrote: > Chris wrote: > > > On Feb 5, 6:15 pm, Glenn Gundlach <stratu...(a)yahoo.com> wrote: > > > On Feb 2, 8:29 am, Chris <christopher.man...(a)gmail.com> wrote: > > > > What is the simplest way to get480Hzfrom 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 > > > > You in North America? PLL the 60Hz power supply up to 480 hz. It will > > > be spot on for frequency. > > > > G² > > > Yes, I am in North America. I need the deck to be portable, so > > working off of mains is not usually going to be an option. The > > capstan motor does run on 60Hz 120VAC, but I would only be able to > > shoot footage where I have mains. The crystal/fork is for the > > inverter as the tape transport is run by a sync motor with a > > sprocketed capstan (the tape is perforated). > > Digikey has 60 KHz crystals. Divide by 5 three times, then by 2 for > your 480 Hz. Or just divide by 1000 and low pass filter it before > amplfing it to drive the 60Hz motor. > > -- > Greed is the root of all eBay. I ordered some CD4060B's (25 for $3 on ebay). I am going to order some 3.9Mhz crystals and divide by 2^13 on the 4060. Should be very easy. |