FET Amplifier - BJT Amplifier dillema

[danny]

meron akong on progress na personal fet amplifier
I based it on an textbook, kinda like pass also
and like nung pinost mo.
trying to make it work sa 12 to 15 volts split supply
it is a class A, few parts
Hoping na sana gumana. ok na sa simulation.

['yus]

split supply, meaning dalawang supplies kelangan nya?
ano pala ang gamit mong simulator?

[danny]

yeah it is a split supply + and -
I am planning to build this little amplifier
not sure kung ano kakalabasan,
first time ko nag nagdedesign ng ganitong
klase na amp. usually I build push pull
na low wattage lang.
ang gamit kong simulator is
yung luma kong power pro na multisim
binili ko way back 2001
i am looking nga s new version
na multisim v10 na libre
cno ang may link na pwede ko download?
mostly na nababasa ko d2 s forum is may mga problem
nde gumagana pag install.
any idea where i can get a free copy that is working smoothly?
thanks po

['yus]

ang hirap talagang mag-design ng hardare sa analog circuits compared sa digital..
lalo na kung hindi sanay, like sa mga FETs, nakakalito kung io-operate sila sa linear/ohmic region..
pero, nakaka-challenge naman.. hehe

[danny]

you are correct, mas mahirap mag design ng analog kaysa digital
lalo na kung nsa highend amplifiers ang linya mo, tapos
lahat ng clients mo ay mga audiophile pa, pambihira, lahat
naririnig kahit lampas na sa pandinig ng tao 20 to 20k
palagi may mga pintas, sa mga gawa mo. 

[rdpzycho]

kahit yung addition ng random noise napapakinggan nila.

alam din nila yung constructive noise at destructive noise.

sobrang selan ng mga tenga nila.

[danny]

@rdpzycho

tama ka talaga. lahat ng noise
pinapakinggan. I myself is already half deaf
so it doesnt matter na cguro sa akin ang tunog.
nde ko na talaga marinig yung mga sinasabi nila.
Anyway, buttom line kahit anong unit ang lumabas
sa market, meron at merong magiging complain
ang bawat isa, you cannot please everybody.
I've been in this business for almost 20 yrs.
at sanay na ako sa mga complain ng mga audio
and videophile.   

and yes maselan ang mga tenga nila hehhe
tama ka.

[rdpzycho]

kaya magandang market ang high end audio. yung maseselan kasi ang tenga ok lang gumastos ng mahal para sa tunog.

[danny]

bwahahaha 
tumpak na tumpak po kayo
ang galing ah paano mo alam hehehehe.
you crack me up!!!

[rdpzycho]

may nakausap na ako High End Audio din sa US, pero DAC ang specialty nila. classmate ng boss ko way back college.

[danny]

basta ako kung ano ok sa pandinig ko
ok na yun hehe
i will not be on a golden ears club hehehe 
basta i will design and build na akala kong
ok sa pandinig ng lahat
pag palpak sori na lang po bwahaha

[rommelpm]

1. MOSFETs tends to be resistive during high loads compared to BJTs that
   exibits thermal runaways thus leads to its own demise. But a short circuit
   protection can be added to the output of the power Transistors.

2. If this will be your first amplifier project, I would suggest that you start
   with BJTs and be familiar with all biasing techniques and computations. You
   will appreciate your own design if you know how each voltages and currents
   were derived.

[danny]

it is a good idea po to start with bjt
which is always the case, but one can also start
with fets depende po kung ano ang mas makakagamayan nila
i have a co worker before he starts with fets projects
but the good thing is he has some backgrounds in xisistor, its just
the projects he started with fets.
I started desgining and building project sa bjt po

[oasis03]

@danny

sir,baka meron ka po jan circuit or schem. 400w-up power amp (MOSFET).
pa share nman po...

thank you sir....^_^

[danny]

@oasis03

I am not sure kung meron akong 400W na MOSFET. I will
try to look sa mga old files ko.
Are you gonna use it sa home lang ba?
alam ko meron ako ung sa book ng friend ko
hanapin ko muna

danny

[oasis03]

@danny

sir pang mobile ko po gagamitin,meron din kc aq MOSFET 150w/ch.
i need more power amp for my subwoofer..tia

[danny]

@danny

sir pang mobile ko po gagamitin,meron din kc aq MOSFET 150w/ch.
i need more power amp for my subwoofer..tia

kung sa subwoofer mo gagamitin
mag class d ka na lang.
usually nowadays sa consumer at commercial
na dinedesign namin ay class D na lang sa subwoofer
medyo complicated nga lang talga ang circuit

[djcma2000]

kaya magandang market ang high end audio. yung maseselan kasi ang tenga ok lang gumastos ng mahal para sa tunog.

I agree with this quote. I have a Japanese friend who is an audiophile. He has a big rack of different kinds/brands of High End Home Theater Amps/Receivers and Speakers from Pioneer, Onkyo, Denon, Sony, JVC and Bose. The models he have can only be seen in Akihabara which is totally expensive!

He already spent millions of Yen for his very expensive hobby! Almost every year he upgrade his systems.

Anyway, Class-D Amps are the best as of now. They efficient, light weight and less space. There are lots of Class-D IC's nowadays you can see in the market specially sa Car Audio. In my company, all IC amps being develop is Class-D.   
 


 

[akosiikem]

I agree with this quote. I have a Japanese friend who is an audiophile. He has a big rack of different kinds/brands of High End Home Theater Amps/Receivers and Speakers from Pioneer, Onkyo, Denon, Sony, JVC and Bose. The models he have can only be seen in Akihabara which is totally expensive!

He already spent millions of Yen for his very expensive hobby! Almost every year he upgrade his systems.

Anyway, Class-D Amps are the best as of now. They efficient, light weight and less space. There are lots of Class-D IC's nowadays you can see in the market specially sa Car Audio. In my company, all IC amps being develop is Class-D.   
 


 

Talagang magandang market. Would you believe pati power cord and interconnects ginagastusan nila ng thousand dollars. Power cord na 3000dollars. What the #$@%!$! Wala namang basis or explanation na effective sya. Meron pang mamahaling caps na snake oil and die electric. Daming myths!!!

[djcma2000]

Talagang magandang market. Would you believe pati power cord and interconnects ginagastusan nila ng thousand dollars. Power cord na 3000dollars. What the #$@%!$! Wala namang basis or explanation na effective sya. Meron pang mamahaling caps na snake oil and die electric. Daming myths!!!

Tama po kayo sir. I agree, not only power cables, some also used power line conditioner (line filter) for their home theater (my japanese friend have it). Daig pa nya yun company namin na may sarili pa siya line conditioner. Yun cables pa nila sa speaker eh at least monster cable grade pa yun specs. Naalala ko nga noon bumili ako ng onkyo 6.1 na receiver mas mahal pa yun HDMI cable nya kaysa sa unit ko hehehe...