40W Power Amplifier

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Re: 40W Power Amplifier

Post by danny on Sat Oct 10, 2015 2:03 pm

alvinquimbo wrote:sir danny paano maka-order nito at magkano ang shipping..?




Hi Alvin depende kung saan ang location mo
iba iba ang ginagamit ni rochie na shipping company

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Re: 40W Power Amplifier

Post by danny on Sat Oct 10, 2015 2:04 pm

Si Rochie ang name ng seller
eto ang email add niya

rochie.canuto@gmail.com


email nyo na siya
baka maubusan kayo
this kit is selling like a hotcake

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Re: 40W Power Amplifier

Post by danny on Sat Oct 10, 2015 2:08 pm

natad123 wrote:@danny.. ok lang po.. by the way.. me suggestion ka po ba dun sa thunderamp ni pagarigan? i am planning to change 3055 to TO-3PL packaging.. anong pwedeng pampalit dun with higher rating sana..


sorry nde ako nag assemble ng pagirigan amp
and nde ko din nasilayan ang schematic nun hehehe
may thread sila sa elab about
pagarigan amp

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Re: 40W Power Amplifier

Post by alvinquimbo on Sat Oct 10, 2015 7:35 pm

ubusan pala ito sir danny omg cge sir icocontact ko si sir Rochie..

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Re: 40W Power Amplifier

Post by danny on Mon Oct 12, 2015 3:12 pm

oo kasi madaming
bumibili, 2nd batch na nga eh

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Re: 40W Power Amplifier

Post by danny on Mon Oct 12, 2015 3:55 pm

by the way, take note walang kasamang traffo ito at heat sink
but you can order seperately din kay rochie


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Re: 40W Power Amplifier

Post by natad123 on Tue Oct 13, 2015 8:23 am

sir danny pa favor po ha? yung sa 40w mod ni abetir.. eto po yung sagot..

http://www.freshpatents.com/-dt20090806ptan20090196005.php

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Re: 40W Power Amplifier

Post by Electro on Tue Oct 13, 2015 11:45 am

sana hindi kami maubusan

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Re: 40W Power Amplifier

Post by natad123 on Wed Oct 14, 2015 5:56 am

@electro: asa dapita inyoha?

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Re: 40W Power Amplifier

Post by danny on Mon Oct 26, 2015 1:57 pm

up lang natin ito

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Re: 40W Power Amplifier

Post by Electro on Wed Oct 28, 2015 10:47 am

master natad123, sa green medows amo master

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Re: 40W Power Amplifier

Post by danny on Fri Dec 04, 2015 4:19 pm

ubos na po ito
wala nang stock

nag papa order na ulit
nde lang sure kung kailan darating

salamat Very Happy

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Re: 40W Power Amplifier

Post by alvinquimbo on Wed Dec 30, 2015 9:16 pm

Sir danny happy new year...tapos ko na gawin itong amplifier mo..tama nga sila ang lupet ng tunog sir......muntik pa akong pumalpak kasi di tumunog nung una kaya napatawag ako kay sir ultra kung anong posibleng dahilan..Pero nang nnireview ko ulit ay magkaiba pala ng pinconfig si D669 at TIP41 kasi gamit ko ay 2SD669 kaya't ginawa ko ay binaliktad lang..ayun sapol..post ko lang itong pic pag nagkatime ako sir..sana sir makagawa kapa ng ibang amplifier na higher wattage..
Ot: @sir danny may nakilala ako na tech sabi nya may diagram daw sya ng sakura na amplifier,try ko na makahingi at ipakita dito sa forum ng macheck kung ok sya...☺☺☺..happy new year ulit..

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Re: 40W Power Amplifier

Post by danny on Mon Jan 04, 2016 10:53 am

hi Alvin
sorry for the late reply
na trankaso ako
anyway, alamat at nagustuhan mo
nga pala, anong preamp at source ang ginamit mo?

cge post mo lang yung sakura na schematic
tingnan natin siya

may mga niluluto pa akong design
stay tuned hehehe

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Re: 40W Power Amplifier

Post by ultrasonic™ on Tue Jan 05, 2016 12:26 pm

oi.. pagaling ka kaagad Sir Danny.. iwasan mo muna si kagz  ^_^

@alvin.. congrats..
about dun sa Sakura meron na yata tayong mga prototype nyan... try ko kalkalin sa baol ko... para mashare din natin dito

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Re: 40W Power Amplifier

Post by alvinquimbo on Thu Jan 07, 2016 6:56 pm

@sir danny/@sir ultra: mga sir nasira yung ampli ko po...ganito po ang nangyari,,habang pinapatunog ang ampli po ay yung 2SD1047 ang umiinit habang ang 2SB817 ang katamtaman lang,kaya nagduda ako...Nang nagcheck ako ulit sa connection ay may namali akong isang tranny yung Q9 or Q8 ata yun, kaya tinanggal ko at inayos..
At nang nagtesting ako ay ok na ang output bale nang scratch sounds pag nakaminimize yung volume pero ang bilis umiinit ng power tranny...kay nag adjust ako ng trimmer,bale sa pag-adjust ko ay clockwise ang pagpihit ko pero pumutok ang dalawang fuse kaya nagdouble check ako sa power tranny at ayun shorted sya..
Tanong lang ko po ay paano iadjust yung trimmer nya?Dapat po ba counter clockwise tapos anong tester ang gagamitin sa ganitong kaliit na Mv? diba 8mv lang or 0.008v tama po ba?Sana matulungan ninyo ako.. going to cry going to cry going to cry

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Re: 40W Power Amplifier

Post by alvinquimbo on Thu Jan 07, 2016 7:01 pm

Diko madownload yung pics sa photobucket mga master... angry angry angry

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Re: 40W Power Amplifier

Post by Hertz on Sun Jan 10, 2016 8:07 am

mag log in ka sa photobucket o gamit ka ng ibang internet browser. eg: internet explorer, firefox, chrome, opera mini & etc..

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Re: 40W Power Amplifier

Post by Hertz on Sun Jan 10, 2016 8:28 am

Getting Bias Current of an Output Transistor of an Amplifier Circuit

In this article, we will be focused on getting the bias current of an output transistor of an amplifier circuit. According to wikipedia:
Biasing in electronics is the method of establishing predetermined voltages or currents at various points of an electronic circuit to set an appropriate operating point. The operating point of a device, also known as bias point, quiescent point, or Q-point, is the steady-state operating condition of an active device (a transistor or vacuum tube) with no input signal applied.
This is the method shared by ricdelros, one of the Elab Forum member, based on the topic about how to get the bias current of an output transistor” Bias voltage can be simply check by following situations that will serve as a guide.
 
1. Power-up the amplifier circuit without Output Transistor.
Having a driver transistors can provide a few hundred milliwatts of power without the Output Transistor which should be enough to tell if an amplifier operation is correct. If it’s going right so far, turn of power and connect the output transistors, turn the bias trimmer to max resistance, connect 8 Ohms load and apply power again.
Example: If you have 60w amp, connect a DC Voltmeter across either of Output Emitter Resistor and adjust Bias Trimmer and adjust trimmer for a reading of slightly less than 20mv, this will set an Idle Current of around “50mA” which is close to specs of 60w. Watch your multimeter while testing. If at anytime the reading jumps when you have no input, “”STOP”” and check quickly for circuit oscillation, if you are not lucky, such condition may blow fuse, amplifier with this kind of problem can cause heartburn and lots of ulcer and stress. Recheck the circuits..


2. Another way is to check Both Emitter Resistor voltage of the output transistor. Connect a Positive lead to Point M and a negative lead to Point N and advance the idle by trimmer until you get a voltage reading of 20 millivolts below.

3. Other very simplest way is to connect a Milliammeter between the Power Supply Source and to either Positive or Negative Rail Terminal (must have a firm connection or else a little loose can blow the opposite fuse). You can see the the idle current here of 50mA as registered in step 1. This method is the one we used in testing the idle current taught by our instructor while I’m studying electronics.

ilabas lang natin ito Sir Danny
Source From Elab

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Re: 40W Power Amplifier

Post by alvinquimbo on Tue Jan 12, 2016 11:07 pm

@sir hertz salamat nito sir...Natapos ko rin...napagana ko rin ng tama..
@sir ultra..sir pacnxa na sa disturbing ha..ok nato sir nakuha na ang tamang bias..pacnxa na kasi makulit ako...hehehe..nxt project ko naman ang p3a amp ni sir jlester..

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Re: 40W Power Amplifier

Post by ultrasonic™ on Wed Jan 13, 2016 11:31 am

Ok lang Vin. No probs.. dapat ako iyong humingi ng Sori. Hindi ko na accept iyong mga call mo last day... naiwan kasi CP ko sa bahay. hindi naman ako nakatext kasi biglang Check Op  ^_^ 

kagabi naman hindi na ako nakakontak sayo o nawala na rin sa isip ko. kasi nag duty nako sa LG GSIS pluto.. napasubo pa ko repair at inuman session  ^_^

nakita ko na pala ang baol ni Sis PT ang Sakura
DL niyo na lang
SAKURA AV735 Amp sect

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Re: 40W Power Amplifier

Post by alvinquimbo on Wed Jan 13, 2016 12:26 pm

ok lang sir ultra...heheheh...naintindihan ko po..ito lang po ngayon ang hobby ko,magcompile ng mga gumaganang diy amplifier.. i dont know i dont know i dont know

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Re: 40W Power Amplifier

Post by danny on Wed Jan 13, 2016 2:03 pm

hi Alvin
sorry now lang ako naka log
ok na pala
ano ba ang nangyari
bakit pumutok

until now may sakit pa ako
na bronchitis ako
bale nag iinhaler ako ngaun
matindi ang tumama sa akin
natrangkasi pa tsk tsk

anyway, sensiya na talaga

musta naman ngaun ang lagay ng ampli mo

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Re: 40W Power Amplifier

Post by ultrasonic™ on Wed Jan 13, 2016 2:30 pm

Sir Danny Pagaling ka...

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Re: 40W Power Amplifier

Post by danny on Wed Jan 13, 2016 2:35 pm

salamat
nde ko inaasahan nga ito eh
halos 3 weeks na ito

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Re: 40W Power Amplifier

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