<div dir="ltr">Dovolim si upozornit, ze ta hodnota klesne na 4.8uF, ne na 7.8uF jak opakovane uvadite. Ale snad vam nebude vadit ani toto. <div>Hezky den,</div><div>Marek</div></div><div class="gmail_extra"><br><div class="gmail_quote">2014-12-14 12:52 GMT+01:00 Jaroslav Buchta <span dir="ltr"><<a href="mailto:jaroslav.buchta@hascomp.cz" target="_blank">jaroslav.buchta@hascomp.cz</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div text="#000000" bgcolor="#FFFFFF">
    <div>No mohl by to aspon zkratit na zlomek
      odpovidajici kapacite pri max. napeti ;-) Ja to pak preskakoval ke
      konci, toho divneho kondiku s vyvody jsem si vsimnul i tech
      grafu...<br>
      Kazdopadne me uspokojil na zacatku ten 10uF X5R co zrovna taky
      osazuju, co byl podle pytlicku predpokladam na 6,3V, ktery mel
      tech 7,8uF mezi 5-6V. Pouzivam je na 3,3 nebo 5,0V takze mi to
      prijde OK. Navic stale ze setrvacnosti pouzivam u techto
      velkokapacitnich keramik 1206, takze to bude snad jeste o neco
      lepsi.<br>
      Ale kazdopadne poucne, doted jsem o tehle vlastnosti nemel tuseni.<br>
      <br>
      Dne 14. 12. 2014 12:38, Marek Sembol napsal(a):<br>
    </div><div><div class="h5">
    <blockquote type="cite">
      <div dir="ltr">Ach jo, a co vy vlastne chcete? To vam k tomu mel
        zatancovat nebo zazpivat, aby vam to nepripadalo nudne?
        Kazdopadne nez ho zabijet - radeji ho ignorujte a nekoukejte na
        nej, ja mam mensi naroky na zabavnost a rad se na dalsi videa
        podivam. 
        <div>Jinak kapacita klesla z 10.6 na 4.8, coz je mene nez
          polovina. No 1/2 bych zlomkem rozhodne nazval. To prosim u
          celkem slusne hmoty X5R. Pokud jste se dodival dal, tak pro
          kondik z Y5V to bylo 10uF->1.5uF (pri 10V)</div>
        <div>Jasne, pro blokovani digitalnich obvodu asi zadne drama.
          Zvlaste, ze tam bezne vidam/pouzivam spis hodnoty
          100nF/10nF/1nF, kde je situace vesmes jeste o hodne lepsi. Na
          druhou stranu kdyz dostane stabilizator polovicni (nebo i
          mensi) kapacitu, nemusi se mu to zrovna libit:)</div>
        <div>Marek</div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">2014-12-14 12:13 GMT+01:00 Jaroslav
          Buchta <span dir="ltr"><<a href="mailto:jaroslav.buchta@hascomp.cz" target="_blank">jaroslav.buchta@hascomp.cz</a>></span>:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div text="#000000" bgcolor="#FFFFFF">
              <div>Australana zabit, tak nudne video jsem jeste
                nevidel... ;-)<br>
                <br>
                Kazdopadne mu kapacita klesla z 10.6 na 7.8 uF, jestli
                jsem dobre pochopil, coz bych se neodvazil nazvat
                zanedbatelnou kapacitou ani zlomkem puvodni kapacity,
                IMHO zadne drama pro takove to blokovani digitalnich
                obvodu...<br>
                <br>
                Dne 14. 12. 2014 11:29, Marek Sembol napsal(a):<br>
              </div>
              <div>
                <div>
                  <blockquote type="cite">
                    <div dir="ltr">Berte to jako fakt. Ano, klesa a
                      klidne na zlomek puvodni kapacity.
                      <div>Tady k tomu ma australan video: <a href="https://www.youtube.com/watch?feature=player_embedded&v=2MQyQUkwmMk" target="_blank">https://www.youtube.com/watch?feature=player_embedded&v=2MQyQUkwmMk</a></div>
                      <div>Marek</div>
                    </div>
                    <div class="gmail_extra"><br>
                      <div class="gmail_quote">2014-12-14 11:06
                        GMT+01:00 Jaroslav Buchta <span dir="ltr"><<a href="mailto:jaroslav.buchta@hascomp.cz" target="_blank">jaroslav.buchta@hascomp.cz</a>></span>:<br>
                        <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
                          <div text="#000000" bgcolor="#FFFFFF">
                            <div>Tak ja teda nevim, ale kdyz ma
                              kondenzator uvedeny nejake jmenovite
                              hodnoty a tolerance, nemely by v ramci
                              techto hodnot platit tak nejak zaroven?<br>
                              Ma to fakt nekdo overeno, ze ta kapacita
                              takhle az moc klesa? Ja bych predpokladal
                              tak tech cca 20% co vyrobce uvadi jako
                              toleranci kapacity, vic ne...<br>
                              <br>
                              Dne 14. 12. 2014 8:46, Marek Sembol
                              napsal(a):<br>
                            </div>
                            <div>
                              <div>
                                <blockquote type="cite">
                                  <div dir="ltr">No ta kapacita (jeji
                                    pokles) zalezi na hodne faktorech a
                                    obecne bude typ od typu jina - jinak
                                    by byl vas zivot prilis
                                    jednoduchy:) 
                                    <div>Obecne zalezi na hmote (C0G
                                      jsou na tom lip nez X7R ci X5R. Ty
                                      jsou na tom lip nez Y5U),
                                      velikosti (vetsi pouzdra jsou na
                                      tom lepe), DC (ty /50V se chovaji
                                      pri 5V podstatne lepe, nez ty
                                      /6.3V), kapacite (ty s vetsi
                                      kapacitou na tom jsou hur)</div>
                                    <div>A mnozi vyrobci pro jistotu
                                      tuto informaci (pokles kapacity s
                                      napetim) celkem kvalitne taji,
                                      dopatrat se grafu byva mnohdy
                                      nadlidsky vykon)</div>
                                    <div><br>
                                    </div>
                                    <div>A k vasi otazce 47uF
                                      kondenzatoru - vzhledem ke
                                      kapacite a vzhledem k provozovani
                                      na napeti blizkemu maximu - tak ta
                                      kapacita bude pravdepodobne
                                      zanedbatelna:)</div>
                                    <div>Marek</div>
                                  </div>
                                  <div class="gmail_extra"><br>
                                    <div class="gmail_quote">2014-12-14
                                      6:56 GMT+01:00 Jaroslav Buchta <span dir="ltr"><<a href="mailto:jaroslav.buchta@hascomp.cz" target="_blank">jaroslav.buchta@hascomp.cz</a>></span>:<br>
                                      <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
                                        <div text="#000000" bgcolor="#FFFFFF">
                                          <div>To je zajimave tema, o
                                            teto vlastnosti jsem abych
                                            rekl pravdu zatim nemel
                                            tuseni...<br>
                                            <br>
                                            To kdyz mam treba
                                            kondenzator 47uF/5V tak
                                            jakou kapacitu tedy bude mit
                                            pri 3.3V a 5V?<br>
                                            Z hlediska blokovani
                                            napajeni digitalnich IO, kdy
                                            se stridaji tyto
                                            velkokapacitni a 100n
                                            keramicke C, je potreba se
                                            tim zabyvat? Nebo je to
                                            horsi, nez kdyz tam dam
                                            tantaly?<br>
                                            <br>
                                            <br>
                                            Dne 14. 12. 2014 0:56, Vláďa
                                            Anděl napsal(a):<br>
                                          </div>
                                          <div>
                                            <div>
                                              <blockquote type="cite">
                                                <div>obávám se, že
                                                  situace bývá ještě
                                                  horší. Pro ten
                                                  rezonanční kmitočet
                                                  nemůžeme uvažovat jen
                                                  indukčnost toho kondu,
                                                  ale je na nějakém
                                                  reálném tišťáku a ten
                                                  si k tomu přidá ještě
                                                  svoji indukčnost. Tady
                                                  pomůže snad jen
                                                  paralelní řada
                                                  kondenzátorů aby spoje
                                                  byly víc širší než
                                                  delší a záleží, jak se
                                                  to podaří geometricky
                                                  rozmístit.<br>
                                                  <br>
                                                  Anděl<br>
                                                   <br>
                                                  Dne 13.12.2014 v 22:53
                                                  Pavel Hudeček
                                                  napsal(a):<br>
                                                </div>
                                                <blockquote type="cite">
                                                  <p>On to není "pokles
                                                    kapacity s
                                                    frekvencí", ale
                                                    zánik kapacity nad
                                                    rezonancí. Prostě se
                                                    odečítá XL-Xc a nad
                                                    rezonancí zvítězí
                                                    XL. S tím se nic
                                                    udělat nedá. Je to
                                                    principiální. Kond v
                                                    určitém pouzdře má
                                                    určitou Ls, která u
                                                    MLCC nijak zvlášť
                                                    nezávisí na C. No a
                                                    čím větší je
                                                    kapacita, tím nižší
                                                    je frekvence, od
                                                    které se celek chová
                                                    jako indukčnost. Je
                                                    tedy zároveň jasné,
                                                    že pokud se takových
                                                    C zapojí více
                                                    paralelně, budou se
                                                    nad fr chovat jako
                                                    L, i kdyby jich bylo
                                                    milion.</p>
                                                  <p><br>
                                                  </p>
                                                  <p>Zajímavější je
                                                    paralelní řazení
                                                    různých kapacit pro
                                                    širokospektrální
                                                    blokování. Dejme
                                                    tomu, že spojíme Ca
                                                    s fr 1 MHz a Cb s fr
                                                    10 MHz, přičemž
                                                    budou mít pro
                                                    jednoduchost nulový
                                                    ESR:</p>
                                                  <p>1. Do 1 MHz je to
                                                    celé C.</p>
                                                  <p>2. Pro 1-10 MHz je
                                                    to divný paralelní
                                                    rezonanční obvod.</p>
                                                  <p>2.a) Těsně nad 1
                                                    MHz je Ca jakoby
                                                    velice malá
                                                    indukčnost (po
                                                    odečtení zbývá malá
                                                    XL), takže jakýkoli
                                                    paralelní C s tím
                                                    nic nenadělá, tady
                                                    to bude indukčnost.</p>
                                                  <p>2.b) Někde mezi
                                                    1-10 MHz je
                                                    rezonance, tady
                                                    nastane přechod mezi
                                                    L a C.</p>
                                                  <p>2.c) Těsně pod 10
                                                    MHz je Cb jakoby
                                                    velice velká
                                                    kapacita (po
                                                    odečtení zbývá malá
                                                    Xc), takže tady je
                                                    to určitě zase
                                                    kapacita.</p>
                                                  <p>3. Od 10 MHz
                                                    indukčnost.</p>
                                                  <p><br>
                                                  </p>
                                                  <p>Dostali jsme tedy
                                                    obvod, který je do 1
                                                    MHz C, pak do něco
                                                    mezi 1-10 je L, pak
                                                    zas C a nad 10 znovu
                                                    L. </p>
                                                  <p><br>
                                                  </p>
                                                  <p>Pokud chceme
                                                    opravdu dosáhnout
                                                    širokopásmového
                                                    blokování, musíme
                                                    paradoxně zvýšit ESR
                                                    všech kondů, kromě
                                                    nejmenšího. V našem
                                                    případě musíme ESR u
                                                    Ca zvednout na
                                                    takovou hodnotu, aby
                                                    jeho R byl vyšší,
                                                    než bude mít Cb
                                                    svoji Xc při 1 MHz.
                                                    Pak se 2 změní
                                                    takto:</p>
                                                  <p>2.a) Ca je odpor se
                                                    zanedbatelnou XL, Cb
                                                    je Xc a je menší než
                                                    R Ca, takže
                                                    výsledkem je C s
                                                    paralelním R.</p>
                                                  <p>2.b) Cb je Xc a
                                                    klesá, takže
                                                    výsledkem je stále
                                                    lepší kapacita.</p>
                                                  <p>2.c) Cb je velmi
                                                    malá Xc, takže je to
                                                    stejné jako v
                                                    předchozím případě.</p>
                                                  <p><br>
                                                  </p>
                                                  <p>Máme tedy trochu
                                                    horší C, ale je to C
                                                    až do 10 MHz. A také
                                                    vysvětlení, proč je
                                                    na blokování vhodné
                                                    používat kondy s VF
                                                    mizerným
                                                    dielektrikem.</p>
                                                  <p><br>
                                                  </p>
                                                  <p>PH</p>
                                                  <p><br>
                                                  </p>
                                                  <p>Od: gatilo <a href="mailto:gatilo@centrum.cz" target="_blank">gatilo@centrum.cz</a></p>
                                                  <blockquote>Pravda,
                                                    pravda, nejak jsem
                                                    ty rozmery domotal,
                                                    10uF/100 je az v
                                                    2220<br>
                                                    <a href="http://product.tdk.com/capacitor/mlcc/detailed_information.php?lang=en&ref=jp&part_no=C5750X7S2A106M230KB" target="_blank">http://product.tdk.com/capacitor/mlcc/detailed_information.php?lang=en&ref=jp&part_no=C5750X7S2A106M230KB</a><br>
                                                    O tom varikapovem
                                                    chovani vim, proto
                                                    jsem pokukoval po
                                                    100V, aby to<br>
                                                    bylo pouzitelne i
                                                    pri 30-40V. Bohuzel,
                                                    jednoduche pravidlo,
                                                    cim mensi<br>
                                                    kond, tim vyraznejsi
                                                    pokles kapacity
                                                    plati jen nekdy,
                                                    jindy je to prast<br>
                                                    jako uhod. Myslim ze
                                                    to muze byt tim,
                                                    kdyz vyrobce u
                                                    vetsiho kondu<br>
                                                    pouzije mene vrstev.
                                                    No ale s tim uz se
                                                    nejak pomalu ucim
                                                    zit.<br>
                                                    Ted mi vic vadi
                                                    pokles s frekvenci.
                                                    Jak to vypada u
                                                    zmineneho 10u/100<br>
                                                    je v priloze,
                                                    prevzato ud vyrobce,
                                                    viz vyse a do 20 MHz
                                                    to urcite<br>
                                                    neni. 2u2/100 v 1206
                                                    ma ten zlom na
                                                    2,88MHz, coz je
                                                    jiste lepsi, ale<br>
                                                    ani tak zadna slava<br>
                                                    (<a href="http://product.tdk.com/capacitor/mlcc/detailed_information.php?lang=en&ref=jp&part_no=C3216X7S2A225M160AB" target="_blank">http://product.tdk.com/capacitor/mlcc/detailed_information.php?lang=en&ref=jp&part_no=C3216X7S2A225M160AB</a>)<br>
                                                    Na ten soft od
                                                    muraty uz jsem taky
                                                    narazil, ale jeste
                                                    netusim, co<br>
                                                    vsechno to umi.<br>
                                                    <br>
                                                    <br>
                                                    Vláďa Anděl napsal:<br>
                                                    > No ono to má na
                                                    rezonanci nějaké
                                                    miliohmy. Elity se
                                                    budou chovat ještě<br>
                                                    > hůř, jen ta
                                                    rezonance je silně
                                                    zatlumená relativně
                                                    velkým ESR. Zrovna <br>
                                                    > včera jsem
                                                    hledal něco o
                                                    keramikách a našel
                                                    jsem tohle<br>
                                                    > <a href="http://ds.murata.co.jp/software/simsurfing/en-us/index.html#" target="_blank">http://ds.murata.co.jp/software/simsurfing/en-us/index.html#</a><br>
                                                    > Kde jste viděl
                                                    10M/100? U kterého
                                                    výrobce? Je k tomu
                                                    nějaký datasheet?<br>
                                                    > Já tam vidím ve
                                                    1210 max 2M2/100 a
                                                    myslím že tak do 20
                                                    MHz je to docela<br>
                                                    > v pohodě. Horší
                                                    je ten pokles
                                                    kapacity na 20% při
                                                    max. napětí. O tom <br>
                                                    > víte? U
                                                    některých kapacit +
                                                    napětí najdete to
                                                    samé v 1210 a v
                                                    1206. Ve<br>
                                                    > 1206 klesá
                                                    kapacita ještě víc.
                                                    Mám už nějakých pár
                                                    let zásobu 4M7/50 v<br>
                                                    > 1812. Dnes to
                                                    všichni dělají jen
                                                    ve 1210 a s těmito
                                                    mizernými parametry
                                                    :-(<br>
                                                    <br>
                                                    <br>
                                                    > Dne 13.12.2014
                                                    v 19:18 gatilo
                                                    napsal(a):<br>
                                                    >> Planuji
                                                    doplnit domaci
                                                    zasoby o moderni,
                                                    vysokokapacitni
                                                    keramicke C,<br>
                                                    >> abych mel
                                                    co sypat do
                                                    spinanych zdroju,
                                                    treba smd1210
                                                    10uF/100V.<br>
                                                    >> No a jak
                                                    tak na to koukam,
                                                    tak to nevypada
                                                    vubec pekne, zmineny
                                                    mlcc<br>
                                                    >> 10 uF
                                                    rezonuje kousek nad
                                                    1 MHz, takze pro
                                                    super duper spinaky,<br>
                                                    >> co jedou na
                                                    1,5MHz se zrovna moc
                                                    nehodi<br>
                                                    >> (<a href="http://product.tdk.com/capacitor/mlcc/detailed_information.php?lang=en&ref=jp&part_no=C3216JB1H106M160AB" target="_blank">http://product.tdk.com/capacitor/mlcc/detailed_information.php?lang=en&ref=jp&part_no=C3216JB1H106M160AB</a>)<br>
                                                    >> Takze 2
                                                    dotazy.<br>
                                                    >> Jaky je
                                                    rozumny odstup
                                                    pracovni a
                                                    rezonancni f, aby
                                                    spinak jeste<br>
                                                    >> rozume
                                                    fungoval<br>
                                                    >> Co se
                                                    stane, kdyz dam 2
                                                    takove C paralelne ?
                                                    Klesne rezonancni f
                                                    na<br>
                                                    >> polovinu ?</blockquote>
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