XO controlled 480Hz Oscillator
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From: John Fields on 5 Feb 2010 13:18 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
From: Chris on 5 Feb 2010 19:58 On Feb 5, 10:18 am, John Fields <jfie...(a)austininstruments.com> wrote: > On Wed, 03 Feb 2010 22:35:43 -0500, ehsjr <eh...(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 Hey guys. I was able to finally get my simulation of the speed control of my fullcoat deck to work correctly. I found two missing parts that I had not included in the simulation. Also, earlier on, Charles helped me find a couple of errors, it now works correctly. There is no mystery on how this thing works any more. It takes a 60 Hz square wave pulse to sync from the camera (with a +12V swing). It uses the 480Hz tuning fork with a divide by 8 circuit to produce this same 60Hz square wave to drive the sync motor at speed. I still have to replace the tuning fork with a crystal oscillator as it is running at 960Hz instead of 480Hz. I like the idea of running it on quartz to keep the start up time down, and I believe the crystal would be more accurate. I could not crack open the tuning fork can to fix a divide by two in the can. The actual tuning fork runs at 960 to keep the size down, but the can is marked 480Hz, and the design of the deck requires the output of the fork to be 480Hz. Therefore, there has to be a divide by two in the can. This is not working, and it is causing the motor not to run very well at all. It runs fine off of the mains, but due to the nature of the deck, it needs to be portable, and sync to the camera not the mains. The circuit simulation was done in LTSpice, an awesome free circuit simulation program. If you guys ever need to proto or reverse engineer something without frying real hardware, it is the way to go. Regards, Chris Maness
From: JosephKK on 5 Feb 2010 20:48 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.
From: Glenn Gundlach on 5 Feb 2010 21:15 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 You in North America? PLL the 60Hz power supply up to 480 hz. It will be spot on for frequency. G²
From: Spehro Pefhany on 5 Feb 2010 22:13
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 Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |