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Article #584Re: Sharp remote control ceramic resonator frequency?
From: Bob Parker
Date: Sat, 26 Mar 2005 14:52
Date: Sat, 26 Mar 2005 14:52
46 lines
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2694 bytes
Oooops, I was replying to Michael not Brian! :) Bob Bob Parker <bobpdeletethis@despammed.com> wrote: >Hi Brian, > Everyone else answered your question for me! As they said, NTSC >colorburst crystals are very common and very cheap. The firmware in >the micro doesn't need a higher clock frequency than that, so that's >why I chose it. > The micro internally divides the 3.58MHz by 8950 (179 x 50) to >produce a 400Hz reference for all its timing. It worked out pretty >well. :) > >Regards, >Bob > > > >"Brian Goldsmith" <brian.goldsmith@nospam.echo1.com.au> wrote: > >> >>"Michael A. Terrell" <mike.terrell@earthlink.net> wrote >> >> >>Bob Parker wrote: >>> >>> The DSE ESR meter uses 3.58MHz.... ;) >>> >>> Bob >> >> >> Was that because you had plenty on hand, or was it recommended for >>the microprocessor you selected? :) >> >> >> >>**** As 3.579545 MHz is the NTSC colour burst frequency,there are millions >>of these crystals around the world.Because of availibility and low cost,they >>get used in all sorts of circuits. >> >>Brian Goldsmith. >>
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X-Google-Thread: 1131b0,4aa73bb615fff9c5 X-Google-Thread: 103407,4aa73bb615fff9c5 X-Google-Attributes: gid1131b0,gid103407,public X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!news.glorb.com!newsfeeds.ihug.co.nz!ihug.co.nz!news.xtra.co.nz!news1.optus.net.au!optus!newsfeeder.syd.optusnet.com.au!news.optusnet.com.au!newsfeed.pacific.net.au!nasal.pacific.net.au!not-for-mail From: Bob Parker <bobpdeletethis@despammed.com> Newsgroups: sci.electronics.repair,aus.electronics Subject: Re: Sharp remote control ceramic resonator frequency? Organization: Electronics Technician Reply-To: bobpdeletethis@despammed.com Message-ID: <0nta41d3q073fnb60tbemn8dfu948l466j@4ax.com> References: <re5j31hsogjlbl79rn8niaijl2n6arp84t@4ax.com> <423ac0c4$0$29448$afc38c87@news.optusnet.com.au> <r0it31ltme9hdht4ko8lh1n3u26df5so1a@4ax.com> <6Co0e.12339$1S4.1279724@news.xtra.co.nz> <46u5419dkmtfdfefl3pvgfinu3b28pp7hu@4ax.com> <1111689578.186716.111270@o13g2000cwo.googlegroups.com> <mg6841tqcvuff3d5f9tqvpf2piuu4l93bj@4ax.com> <4244564E.2FF7A2FC@earthlink.net> <9X11e.12034$C7.11056@news-server.bigpond.net.au> <3ata41pj8uhodh255tbbb51hfcj0pjsmmm@4ax.com> X-Newsreader: Forte Free Agent 2.0/32.652 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 47 Date: Sun, 27 Mar 2005 01:52:19 +1100 NNTP-Posting-Host: 61.8.39.254 X-Complaints-To: news@pacific.net.au X-Trace: nasal.pacific.net.au 1111848953 61.8.39.254 (Sun, 27 Mar 2005 01:55:53 EST) NNTP-Posting-Date: Sun, 27 Mar 2005 01:55:53 EST