<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Skusal som krystal “odtazit”, toto myslim nie je problem...</div><div dir="ltr"><br></div><div dir="ltr"><br>On 14 Nov 2018, at 17:06, Zuffa Jan <<a href="mailto:ZuffaJ@cgc.sk">ZuffaJ@cgc.sk</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Napada ma uz len ze vyssie napatie pretazuje vykonovo krystal a ten ide<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">do rezonancie vo vyssom pasme<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">j.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Hw-list [<a href="mailto:hw-list-bounces@list.hw.cz">mailto:hw-list-bounces@list.hw.cz</a>]
<b>On Behalf Of </b>Daniel Valuch<br>
<b>Sent:</b> Wednesday, November 14, 2018 4:54 PM<br>
<b>To:</b> HW-news<br>
<b>Subject:</b> oscilator<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Zdravim osadenstvo,<o:p></o:p></p>
<p>trochu sa trapim s krystalovym oscilatorom. Je tam 32kHz krystal, doporucena zatazovacia kapacita 12.5pF, shunt kapacita 1pF, ESR 50kOhm. Pouzivam HC hradla.<o:p></o:p></p>
<p>Uz sa to konecne rozkmitalo, ale na hranach vidim niekolko velmi rychlych zakmitov (50ns pulzy, ide to z oscilatora, je to kompletny pulz). Vsimol som si, ze ked znizim napajacie napatie z 5V na 2.7-3V tak zakmity zmiznu a signaly vyzeraju ako maju. Na vstupe
IC19A je sinus o spravnej frekvencii s amplitudou okolo 2V a vidim tak kedy sa hradlo prepina. Skoro by som povedal, ze signal je prilis pomaly na rychle hradlo a zakmity sposobuje nizke dv/dt. Neviem dojst na to, kde je problem...<o:p></o:p></p>
<p>Druhe zapojenie krystaloveho oscilatora s dvoma invertormi je nevhodne pre tento typ krystalu, lebo sa neda nastavit drive power. Stale sa da postavit oscilator s jednym tranzistorom, ale tomu by som sa rad vyhol koli potrebe pouzitia dalsieho typu suciastky.
Teraz mam v celom zapojeni len 3 druhy integrovaneho obvodu, co je optimalne.<o:p></o:p></p>
<p>Napada niekoho nejake postrcenie?<o:p></o:p></p>
<p>b.<o:p></o:p></p>
<p><o:p> </o:p></p>
<p><image001.png><o:p></o:p></p>
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