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    Já jsem si oblíbil 74HC14   6ks schmitt hradel.<br>
    astabil vznikne jako c ze vstupu na zem a odpor z výstupu na vstup.<br>
    Hrubý odhad frekvence je f=1/(2*rc)<br>
    Pokud část R uděláte potencioemtrem, pak lze i nastavovat.<br>
    Nic jednoduššího si nedokážu představit.<br>
    <br>
    Zapik<br>
    <br>
    <br>
    <br>
    <div class="moz-cite-prefix">Dne 26.8.2014 21:24, Andrej Jancura
      napsal(a):<br>
    </div>
    <blockquote
cite="mid:CALQx4rKg=mqsuGsV-J+1ZMHycg7O2oFrfKkGH0QdxKhR=x8EHw@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div>To uz by bol velmi velky "pure" analog... Aj ked ja som v
          mojej otazke nenapisal, ze by som rad tu frekvenciu menit
          potenciometrom. To ma napadlo ako typicka aplikacia pre tu
          555...  <br>
          <br>
        </div>
        A.</div>
      <div class="gmail_extra"><br>
        <br>
        <div class="gmail_quote">2014-08-26 20:30 GMT+02:00 Kručinský
          Ladislav <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:ladislav.krucinsky@linde-mh.cz"
              target="_blank">ladislav.krucinsky@linde-mh.cz</a>></span>:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div link="blue" vlink="purple" lang="CS">
              <div>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">A
                    takový kacířský dotaz – co tak zkusit si postavit
                    astabilní klopný obvod z tranzistorů ?</span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Nebo
                    je to už moc „obsolete“ ?</span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Zdravím</span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">L.
                    Kručinský</span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
                <p class="MsoNormal" style="margin-left:35.4pt"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
                    Hw-list [mailto:<a moz-do-not-send="true"
                      href="mailto:hw-list-bounces@list.hw.cz"
                      target="_blank">hw-list-bounces@list.hw.cz</a>]
                    <b>On Behalf Of </b>Andrej Jancura<br>
                    <b>Sent:</b> Tuesday, August 26, 2014 5:45 PM<br>
                    <b>To:</b> HW-news<br>
                    <b>Subject:</b> Re: Tip na variant 555...</span></p>
                <div>
                  <div class="h5">
                    <p class="MsoNormal" style="margin-left:35.4pt"> </p>
                    <div>
                      <div>
                        <div>
                          <div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
                                Dobry den,</p>
                            </div>
                            <p class="MsoNormal"
                              style="margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
                              velmi pekne dakujem za Vase poznamky. Ja
                              som uz pozrel na stranku gme a maju aj
                              obycajnu aj tu TLC555.</p>
                          </div>
                          <p class="MsoNormal"
                            style="margin-left:35.4pt">Zatial mam len
                            ideovu predstavu na urovni nejakych
                            funkcnych blokov. Z tych Vasich poznamok ma
                            hned napadlo, ze problem bude pri tej tlc
                            verzii zatazitelnost
                          </p>
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                        <p class="MsoNormal"
                          style="margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
                          vystupu, nakolko za tym by mala ist mala
                          impedancia. Pri normalnej 555 to nie je az
                          taky problem, nakolko ta by mala dat 200mA.</p>
                      </div>
                      <div>
                        <p class="MsoNormal" style="margin-left:35.4pt">Este
                          raz velmi pekne dakujem.</p>
                      </div>
                      <div>
                        <p class="MsoNormal" style="margin-left:35.4pt"> </p>
                      </div>
                      <p class="MsoNormal" style="margin-left:35.4pt">A.</p>
                      <div>
                        <p class="MsoNormal"
                          style="margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
                           </p>
                        <div>
                          <p class="MsoNormal"
                            style="margin-left:35.4pt">2014-08-26 17:20
                            GMT+02:00 Petr Labaj <<a
                              moz-do-not-send="true"
                              href="mailto:labaj@volny.cz"
                              target="_blank">labaj@volny.cz</a>>:</p>
                          <div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"><span
                                  style="font-family:"Arial
                                  CE","sans-serif"">Pár
                                  poznámek, co jsem si kdysi na toto
                                  téma napsal:</span></p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"> </p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"><span
                                  style="font-family:"Arial
                                  CE","sans-serif"">CMOS
                                  verze se liší minimálním napětím, od
                                  kterého pracují.<br>
                                  Jedině LMC555 od National
                                  Semiconductor má zaručované minimální<br>
                                  napájení od 1.5 V a TLC555C má typ
                                  1.33V (max 1.65V), ostatní jedou<br>
                                  až od 2 V (TLC555, TS555, ICM7555
                                  atd.), původní LM555 až od 4.5 V.</span></p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"> </p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"><span
                                  style="font-family:"Arial
                                  CE","sans-serif"">Dost
                                  rozdílné jsou proudové zatižitelnosti.
                                  Např. TLC555 má (pro L/H)<br>
                                  -100mA/+10mA, TS555 a LMC555 mají
                                  naopak -10mA/+50mA, ICM7555 to
                                  explicitně<br>
                                  neuvádí, ale vypadá to tak na
                                  -10mA/+3mA, původní NE555 má
                                  -200mA/+200mA.</span></p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"> </p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"><span
                                  style="font-family:"Arial
                                  CE","sans-serif"">Ta
                                  LMC555 je i nejrychlejší, jede až do
                                  typ. 3 MHz, ostatní jedou do 0.1 MHz<br>
                                  (min. puvodní LM555), 0.5 MHz (min.
                                  ICM7555), 2.1 MHz (typ. TLC555)<br>
                                  nebo 2.7 MHz (typ. TS555). Ale je taky
                                  výrazně nejdražší.</span></p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"> </p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"><span
                                  style="font-family:"Arial
                                  CE","sans-serif"">TI
                                  dělá ještě verzi TLC551, která jede
                                  již od 1 V, max. frekvence je typ. 1.8
                                  MHz.<br>
                                  Běžně jsem ji ale nikde neviděl
                                  dostupnou, prodává ji jen Farnell za
                                  dost velké peníze.</span></p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"><span
                                  style="font-family:"Arial
                                  CE","sans-serif""><br>
                                  Z CMOS verzí je nejlevnější a
                                  nejdostupnější TS555, i parametrově je
                                  velmi dobrá.</span></p>
                            </div>
                            <div>
                              <p class="MsoNormal"
                                style="margin-left:35.4pt"><span
                                  style="font-family:"Arial
                                  CE","sans-serif";color:#888888">PL</span><span
                                  style="color:#888888"></span></p>
                            </div>
                            <div>
                              <div>
                                <blockquote
                                  style="border:none;border-left:solid
                                  black 1.5pt;padding:0cm 0cm 0cm
4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
                                  <div>
                                    <p class="MsoNormal"
                                      style="margin-left:35.4pt"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">-----
                                        Original Message -----
                                      </span></p>
                                  </div>
                                  <div>
                                    <p class="MsoNormal"
                                      style="margin-left:35.4pt;background:#e4e4e4"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
                                        <a moz-do-not-send="true"
                                          href="mailto:aj.hwlist@gmail.com"
                                          title="aj.hwlist@gmail.com"
                                          target="_blank">
                                          Andrej Jancura</a> </span></p>
                                  </div>
                                  <div>
                                    <p class="MsoNormal"
                                      style="margin-left:35.4pt"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">To:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
                                        <a moz-do-not-send="true"
                                          href="mailto:hw-list@list.hw.cz"
                                          title="hw-list@list.hw.cz"
                                          target="_blank">HW-news</a>
                                      </span></p>
                                  </div>
                                  <div>
                                    <p class="MsoNormal"
                                      style="margin-left:35.4pt"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Sent:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
                                        Tuesday, August 26, 2014 4:48 PM</span></p>
                                  </div>
                                  <div>
                                    <p class="MsoNormal"
                                      style="margin-left:35.4pt"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Subject:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
                                        Tip na variant 555...</span></p>
                                  </div>
                                  <div>
                                    <p class="MsoNormal"
                                      style="margin-left:35.4pt"> </p>
                                  </div>
                                  <div>
                                    <div>
                                      <div>
                                        <p class="MsoNormal"
                                          style="margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
                                          Dobry den,</p>
                                      </div>
                                      <p class="MsoNormal"
                                        style="margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
                                        chcel by som sa spytat vazeneho
                                        osadenstva, ci nahodou neviete o
                                        nejakom klone casovaca 555,
                                        ktory by isiel spolahlivo kusok
                                        nad 1,1 MHz. Normalna 555 ide do
                                        0,5MHz, len ja by som potreboval
                                        nieco co by islo do toho MHz.
                                        Pripadne neviete o nejakom inom
                                        obvode, ktory by dokazal
                                        generovat obdlznik v rozsahu 0 -
                                        1 MHz. Mna napada len max038,
                                        ale mozno niekto viete o nejakom
                                        inom obvode. Dakujem.</p>
                                    </div>
                                    <p class="MsoNormal"
                                      style="margin-left:35.4pt">A.</p>
                                  </div>
                                </blockquote>
                              </div>
                            </div>
                          </div>
                          <p class="MsoNormal"
                            style="margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
                            <br>
_______________________________________________<br>
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                              target="_blank">Hw-list@list.hw.cz</a><br>
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                        <p class="MsoNormal" style="margin-left:35.4pt"> </p>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
            <br>
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            <br>
          </blockquote>
        </div>
        <br>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
HW-list mailing list  -  sponsored by <a class="moz-txt-link-abbreviated" href="http://www.HW.cz">www.HW.cz</a>
<a class="moz-txt-link-abbreviated" href="mailto:Hw-list@list.hw.cz">Hw-list@list.hw.cz</a>
<a class="moz-txt-link-freetext" href="http://list.hw.cz/mailman/listinfo/hw-list">http://list.hw.cz/mailman/listinfo/hw-list</a>
</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Petr "Zapik" Zapadlo</pre>
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