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"Hi-Fi svět" federmann.cz :: Zobrazit téma - Jak měřit Hi-Fi zesilovače a jejich pracovní oblast
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Jak měřit Hi-Fi zesilovače a jejich pracovní oblast
http://www.forum.federmann.cz/viewtopic.php?f=34&t=937
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Autor:  vladzin [ ned 27. kvě 2012 14:31:14 ]
Předmět příspěvku:  Jak měřit Hi-Fi zesilovače a jejich pracovní oblast

Ta úvaha o zrychlení hmotného bodu je velmi podnětná a vysvětluje velmi jednoduše, proč se u akustických nástrojů nebudou nikdy vyskytovat frekvence o kmitočtech 100kHz a více s plnou amplitudou a v základní frekvenci.

Bylo by zajímavé spočítat, na kolik desítek nebo stovek kg by musela být napnuta struna na kytaře a s jakou silou by bylo nutno ji uvést do pohybu, aby vydala tón 100kHz v plné amplitudě a základní frekvenci.


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Příspěvek vznikl dříve než byl dopsán článek, proto přesunut na správné místo B.F.

Autor:  Federmann [ ned 27. kvě 2012 15:19:44 ]
Předmět příspěvku:  Jak měřit Hi-Fi zesilovače a jejich pracovní oblast


Autor:  Federmann [ ned 27. kvě 2012 15:41:31 ]
Předmět příspěvku:  Re: Re: Měření zesilovače HQQF-55-506W_ULN, vysoké frekvence

K tomu mne navedla poněkud zmatená diskuse na slovanetu k formátu SACD, kde někteří ani netuší jak 1bit převodník funguje, ale hlavně mohu snad prozradit soukromý text k přetížení při záznamu na Vinyl od Zbyňka Lébra a v neposlední míře příspěvek na diyaudio http://www.diyaudio.com/forums/vendors-bazaar/176365-mosfet-amp-5-pairs-irfp240-9240-a-18.html#post3038058 a jim podobné, kdy by chtěli někteří stále testovat na plný rozkmit při mezní frekvenci.

Pak byl již jen krůček k tomu, abych velmi jednoduše fyzikálně popsal vznik zvuku a jeho meze, které korespondují i s elektrickou cestou.

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