tag:blogger.com,1999:blog-10321788235868641032024-02-18T23:27:21.408-08:00Kituri electroniceMarianhttp://www.blogger.com/profile/12066322765758365836noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-1032178823586864103.post-67166415448902881572012-08-06T04:35:00.002-07:002012-08-09T21:28:15.732-07:00VU-metru cu AN6884<div style="line-height: 150%; margin-bottom: .0001pt; margin: 0cm; text-align: justify;">
<span lang="RO" style="font-family: "Verdana","sans-serif"; mso-ansi-language: RO;"><span style="mso-tab-count: 1;"> <span style="font-size: small;"> </span></span><span style="font-size: small;">Un vu-metru foarte simplu se poate realiza
cu circuitul integrat AN6884. Acest circuit integrat poate comanda 5 leduri,
accepta o gama larga a tensiunii de alimentare (3,5 - 16 V), deschiderea
ledurilor se realizeaza dupa o functie logaritmica (-10, -5, 0, 3 si 6 dB), iar
curentul maxim pe fiecare iesire va fi constant (15 mA), potrivit pentru
diferite tipuri de leduri. Daca tensiunea de alimentare a montajului este mai
mare de 6V, este necesara o rezistenta de limitare "R" introdusa
intre Vcc si anozii ledurilor, valoarea acesteia fiind aleasa in functie de
temperatura maxima ambianta si de tensiunea de alimentare (vezi tabel).</span></span></div>
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<span lang="RO" style="font-family: "Verdana","sans-serif"; font-size: small;"> Fata de schema prezentata de producator,
am mai introdus cate un led pe fiecare canal, care sta in permanenta aprins.
Cablajul are dimensiune de 50 x 40 mm<a href="https://doc-0g-9c-docs.googleusercontent.com/docs/securesc/e38hal770uodit7i0j4623vsd2kmpt4b/6mviqh4rekqc11mhcca9cicnq09d7i0r/1344333600000/06413591357479255922/06413591357479255922/0B6dO8uF7QlE-a0ZwLURQT2g2RUE?e=download" style="color: blue;"></a>. </span></div>
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