DC Offset

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DC Offset

Post by alvinquimbo on Thu Feb 04, 2016 7:27 pm

Mga sis gusto lang magclarify dito, diba ang dc offset is idle voltage nya na wala ka pang input?So nag lalaro ito between 1mv to 50mv or depende sa amp nya..Tanong ko sis yung 40watts ampli ni sir danny at yung p3a amp ni sir jlester ay ilang impedance ang pwepwede  sa amp na ito..Kaya ba nito maghandle ng 2ohms to 4 ohms? Kasi may napansin ako sa ginawa ko na amp sa 40 watts at p3a amp, kapag 8ohms impedance ang gamit ko lalo na sa mga 3way speaker ay ok yung init ng ng power tranny..Pero kapag gumamit ako ng speaker na may impedance na 3ohms-4ohms ay mabilis umiinit si power tranny. Ano kaya ito mga sis..?tama naman po yung biasing nya kasi halos 0mv na ang adjustment ko kasi sabi nyo mas mababa ay mas mabuti..
    Tapos sir danny saan makikita iyong differential tranny??Siguro mga sis sa amp na gawa ko ay 8ohms nalang na impedance na speaker ang gagamitin ko ok..Salamat for any inputs mga sis..
Ot: ano pong ibig sabihin ng matching diff tranny??Tapos sir ok lang ba kung magbias ka  sa output mismo ng amplifier or mas ok kung magbias ka basi sa tutorial ni sir danny base on biasing of amplifier..? Cool Cool Cool Very Happy Very Happy Very Happy

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Re: DC Offset

Post by danny on Fri Feb 05, 2016 1:41 pm

hi Alvin
the dc offset should at least 20mV or lower
tandaan mo, the lower the better.
my amp can handle 4 ohms, lowest na iyan
tapos dapat higher ang rating ng current ng supply mo
normal na mag init ang mga outputs kasi
you are running them at lower impedance

diff tranny ay yung input transistor mismo
yung dalawa hehehe

paano ka ba mag sukat ng bias
can you post your pic kung san ka ng susukat ng bias at ng offset


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Re: DC Offset

Post by alvinquimbo on Fri Feb 05, 2016 5:34 pm

Salamat sa pagsagot sir Danny, sinunod ko lang yun procedure mo sir danny, ganun ako nagtest ng dc offset..Ganun pala yun, kasi napansin ko talaga sir na pag mababa ang impedance ay umiinit talaga sya, pero pag 8ohms naman ay ok na ok sya..cge lang sir upload ko lang yung pic nya..Siguro para mas safe ay gagamit nalang ako ng speaker na may 8ohms impedance..
Tapos sir yung design nyo pala ay common po pala. Kasi may narepair ako na sansui integrated amplifier at may biasing din sya, nasa 45watts RMS sya,pero may caution na nakalagay na speaker na gagamitin ay 8-16ohms ang impedance kaya napatanong ako bigla sa inyo kung anong impedance ang kayang ihandle ng amps..Tnx sir.. Very Happy Very Happy Very Happy

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Re: DC Offset

Post by ultrasonic™ on Fri Feb 05, 2016 5:57 pm

mag aagree nlng ako.. nasagot na ni Sir Danny  Very Happy
pag masxado ng mababa ang impedance ng spkr.. mas lalong mabilis yang mag iinit.. kung pababayaan ay tuluyang mag bi breakdown.. 
inversely kasi yan eh.. pag mababa ang resistance mabigat yan para sa amp, kung mataas naman ay magaan yan... paghahambing lang  ^_^ 
para iwas overload

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Re: DC Offset

Post by alvinquimbo on Sat Feb 06, 2016 12:07 am

salamat sir ultra...at least alam ko na para maiwasan kung masibakan ng power tranny..hehehe... i dont know i dont know i dont know

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Re: DC Offset

Post by danny on Sat Feb 06, 2016 1:52 pm

ayos
tumpak Very Happy

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Re: DC Offset

Post by DJFEL on Sun Feb 07, 2016 8:21 pm

basa basa nalang...

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Re: DC Offset

Post by natad123 on Mon Feb 08, 2016 8:18 am

pero tanong lang.. paano ko pababain yung impedance without making sacrifice some cost like adding power tranny?

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Re: DC Offset

Post by ultrasonic™ on Tue Feb 09, 2016 10:54 am

kung adding power tranny.. parallel with different resistor dapat yan. pero maraming pwede e considered... dapat hindi underrated ang trafo mo kasi useless din ang adding mo kung hindi nmn kaya ng trafo mo. meron din computation yan para makuha mo ang max power na kaya lng ibigay o ihandle ng tranny

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Re: DC Offset

Post by sherlanmamaril on Sun Mar 20, 2016 12:39 pm

naguguluhan ako sa dc offset sabi design daw ito ng ampli,  but nd ako agree sa ganun hehehe , nasabi n a din ni google yung  minimal distortion  paturu pa ho

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Re: DC Offset

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