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    Pokud to nebudou velký plácačky Tesla, tak všechno keramiku. I těch
    33µ.<br>
    <br>
    Velký plácačky se chovaly jako mikrofony, nejlepší efekt byl při
    použití v kytarovém combu:-)<br>
    Dnešní MLCC, nejlíp SMD, tohle nedělaj.<br>
    <br>
    Dnes už zbývá jen napěťová závislost velkých kapacit, horší při
    menším poměru U/Unominal,<br>
    ale reálný projev vyžaduje významně měnit u v průběhu periody
    signálu (poměr du/Unominal).<br>
    <br>
    Takže malý C jsou jasný keramiky, navíc i ta du bude 00nic.<br>
    Akorát C4 bych raději dal větší napěťovou rezervu.<br>
    Takže třeba 33µ/16 a 10µ/25.<br>
    <br>
    PH<br>
    <br>
    <div class="moz-cite-prefix">Dne 22.01.2025 v 11:02 Róbert Šuška
      napsal(a):<br>
    </div>
    <blockquote type="cite"
cite="mid:CAHnQEC1vUQ5T=uuAsg-iCEOm_w020cT52_-4bF_Mc1a7vzAA4g@mail.gmail.com">
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        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>Do
            vyrobenej doštičky si už dcéra osadila rezistory a dneska
            nás čaká pokračovanie, kondenzátory atď. Tak som sa chcel
            opýtať, aby bol výsledok čo najlepší, aké druhy
            kondenzátorov zvoliť. Mám na mysli keramické/fóliové. Jedná
            sa mi o Cin, Cf a C2. Skúsim si tipnúť Cin keramika Cf a C2
            fóliové?</span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><a
            href="https://sound-au.com/p202-f3.gif"
            moz-do-not-send="true" class="moz-txt-link-freetext">https://sound-au.com/p202-f3.gif</a></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif">Robo<br>
        </p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><br>
        </p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><a
            name="_MailOriginal" moz-do-not-send="true"><span>-----Original
              Message-----<br>
              From: Hw-list <hw-list-bounces@list.hw.cz> On Behalf
              Of Vláďa Anděl<br>
              Sent: Tuesday, January 14, 2025 11:08 AM<br>
              To: hw-list@list.hw.cz<br>
              Subject: Re: Predzosilňovač k piezo meniču akustickej
              gitary</span><span></span></a></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>My
            jsme
            experimentovali s krystalem z přenosky, ale taky to nebylo
            ono. <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>Pak
            jsem někde v
            bazaru sehnal krystalové mikrofony. To byl v principu <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>taky
            krystal ze
            siegnettovy soli, ale byl větší. Ten krystal z mikrofonu <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>byl
            povoskovaný,
            aby k němu nemohla vlhkost a nic nevydržel, hodně se <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>lámal.
            Takže se
            zase nedal přilepit. Nějak to hrálo, ale strčit do <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>kytary
            mikrofon
            bylo skoro lepší.<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>Anděl<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>Dne
            13.01.2025 v
            22:52 Pavel Kutina napsal(a):<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            Tedy jestli
            správně tuším, jak jste starý, tak "za našich mladých let" <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            nikdo ani
            neuvažoval o tom, že by ten křemíkový výbrus použil k něčemu
            <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            tak
            přízemnímu, jako je snímání zvuku, a ještě navíc z kytary :)<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            Ale vážně -
            první piezosnímač na akustiku jsem si kupoval až pár let <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            po
            revoluci, předtím jsem experimentoval s pípákem z
            (nefunkčních) <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            pašovaných
            digitálek, ale nějak to nebylo ono. A ono by to možná bylo <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            ono, kdyby
            to už tenkrát dostalo odpovídající hodněvysokoimpedanční <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            předzesilovač
            a ne jen ten overdrive s KC509F, do kterého jsem to <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            připojoval
            já :)<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            Pavel
            Kutina<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            -----
            Original Message ----- From: "Vláďa Anděl" <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            <</span><a href="mailto:vaelektronik@vaelektronik.cz"
            style="color:rgb(5,99,193);text-decoration:underline"
            moz-do-not-send="true"><span><span
                style="color:windowtext;text-decoration:none">vaelektronik@vaelektronik.cz</span></span></a><span>><span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            To: <</span><a href="mailto:hw-list@list.hw.cz"
            style="color:rgb(5,99,193);text-decoration:underline"
            moz-do-not-send="true"><span><span
                style="color:windowtext;text-decoration:none">hw-list@list.hw.cz</span></span></a><span>><span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            Sent:
            Monday, January 13, 2025 10:33 PM<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            Subject:
            Re: Predzosilňovač k piezo meniču akustickej gitary<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            Dne
            13.01.2025 v 20:29 Pavel Kutina napsal(a):<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Odkaz
            na Ali se mi neotevírá (prázdná stránka, nevím proč), ale <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            jestli
            to nemá žádnou svoji "inteligenci", pak je to opravdu nutné
            <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            připojovat k předzesilovači s velkým vstupním odporem, což
            zapojení z <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            třetího
            odkazu není (ten je pro vinuté snímače).<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            A
            vzhledem k tomu, že s tím určitě budete kroutit a testovat,
            co co <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            ovlivňuje, tak bych šel v první fázi podle obr 3 (protože je
            <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            jednodušší a výsledek bude slyšet hned), v druhé fázi k tomu
            u číňana <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            koupíte
            celý předzesilovač s EQ a ladičkou... <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
          </span><a
            href="https://vi.aliexpress.com/item/1005002143231813.html"
            style="color:rgb(5,99,193);text-decoration:underline"
            moz-do-not-send="true"><span><span
                style="color:windowtext;text-decoration:none">https://vi.aliexpress.com/item/1005002143231813.html</span></span></a><span><span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Mám
            podobný v kytaře a funguje, jen to chce trochu truhlařiny.<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Pavel
            Kutina<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            -----
            Original Message ----- From: Róbert Šuška<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            To: </span><a href="mailto:hw-list@list.hw.cz"
            style="color:rgb(5,99,193);text-decoration:underline"
            moz-do-not-send="true"><span><span
                style="color:windowtext;text-decoration:none">hw-list@list.hw.cz</span></span></a><span><span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Sent:
            Monday, January 13, 2025 7:39 PM<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Subject: Predzosilňovač k piezo meniču akustickej gitary<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Za
            našich mladých let se do takového předzesilovače dal jeden <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            tranzistor. Tehdy BF245, protože to byl jediný, co se dal
            sehnat :-) <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Dneska
            bych tam dal 2SK209. Nevím, jak je to se šumem OZ, ale
            říkalo <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            se, že
            vlivem těch velkých záporných zpětných vazeb je ten šum
            vyšší, <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            než šum
            samotného tranzistoru. Sice ten jeden tranzistor bude mít <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            nějaké
            zkreslení, ale asi né zas tak velké, aby vadilo a příznivci
            <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            elektronek říkali, že 2. harmonická zvuk pročišťuje :-)<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>
            Anděl<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>><span> </span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Dobrý večer,<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            dcéra
            cvičí na gitaru a chcel by som zostrojiť predzosilňovač pre
            <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            piezo
            menič, ktorý pripojím na linkový vstup zvukovej karty.
            Skorej <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            ako to
            spravím chcel som sa opýtať aké zapojenie je na to
            najvhodnejšie?<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Menič:<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
          </span><a
            href="https://vi.aliexpress.com/item/32905830963.htm"
            style="color:rgb(5,99,193);text-decoration:underline"
            moz-do-not-send="true"><span><span
                style="color:windowtext;text-decoration:none">https://vi.aliexpress.com/item/32905830963.htm</span></span></a><span><span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Na
            snímači je trimer ktorý mení kapacitu od cca 500pF do 12nF
            merané <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            pri
            1kHz.<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Objavil
            som zaujímavé zapojenia pre rôzne kapacity piezo meničov:<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
          </span><a href="https://sound-au.com/project202.htm"
            style="color:rgb(5,99,193);text-decoration:underline"
            moz-do-not-send="true"><span><span
                style="color:windowtext;text-decoration:none">https://sound-au.com/project202.htm</span></span></a><span><span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Tak si
            hovorím, že zapojenie z obrázku 3 bude asi najvhodnejšie a <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            trimrom
            na meniči sa krútiť nebude. Nastavím ho na 10nF a bude to <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            fungovať?<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            Tu je
            ešte jedno zapojenie, ale to prvé sa mi páči viac. Čisto <span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
            pocitovo :).<span></span></span></p>
        <p class="gmail-MsoPlainText"
style="margin:0cm 0cm 0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span>>>
          </span><a
            href="https://www.eeweb.com/electric-guitar-preamplifier/"
            style="color:rgb(5,99,193);text-decoration:underline"
            moz-do-not-send="true"><span><span
                style="color:windowtext;text-decoration:none">https://www.eeweb.com/electric-guitar-preamplifier/</span></span></a><span><span></span></span></p>
      </div>
    </blockquote>
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