Booster amplifier using MJ2955

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Booster amplifier using MJ2955

Post by Romy on Tue Jan 01, 2013 3:47 pm

Mga sir magandang araw po. regarding po sa booster amplifier using MJ2955 meron po akong problema sa power supply. nabili ko po 2 kelan lang 2nd hand, power supply po ang sira. nagpalit ako ng power transistor 2N3055 nagpwede namn, after a week bumigay na namn ung transitor then palit ulit. tanong ko lang po sana kung anung main cause nito, yung output reading ko po sa supply eh 30v.

nagkabit po ako ng fan kala ko overheating lang ang problema. ok xa within a week pero nung tumagal bumigay na naman yung transitor. anu po pla ung max capacity na speaker nito at kung ilang watts po ang output? salamat po in advance. more power!

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Re: Booster amplifier using MJ2955

Post by arkin on Tue Jan 01, 2013 5:44 pm

hindi pwding pamalit yong 2n3055 sa mj2955.npn ang 2n,samantalang pnp ang mj.about sa power suply,cguradong kabang tama ang pinalit mo?

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Re: Booster amplifier using MJ2955

Post by Romy on Tue Jan 01, 2013 5:53 pm

yung mj2955 po ung output ng ampli. ung 2n3055 un po ung out ng power supply. un po ung original na pyesa niya. ung pinalitan ko ung sa supply lang po wala naman po problema sa mj2955. problema ko lang po bakit laging bumibigay ung power supply eh un naman po ung orig na pyesa niya.

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Re: Booster amplifier using MJ2955

Post by arkin on Tue Jan 01, 2013 10:27 pm

ah ok!mali pla pagkaintindi ko Very Happy cgurado ka bang orig ang ipinalit mo?pwede mkita ang picture ng 2n3055...mukhang intersting ang desenyo ng booster mo ah..so bale parting regulator circuit ang 2n3055.

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Re: Booster amplifier using MJ2955

Post by Romy on Tue Jan 01, 2013 11:58 pm

yup. sa regulator circuit nga un sir,.may nakita nga pala akong leak dun sa main caps 4700/35v ung malaki lumobo yung ilalim tapos mejo basa. yun kaya ung cause ng pagkasira nung transistor?

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Re: Booster amplifier using MJ2955

Post by Digitap on Wed Jan 02, 2013 12:13 pm


baka po kuya mali na ang bias niya. check niyo po ang mga resistor niya baka nag change value

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Re: Booster amplifier using MJ2955

Post by danny on Wed Jan 02, 2013 12:44 pm

sayang sana may schematic

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Re: Booster amplifier using MJ2955

Post by arkin on Wed Jan 02, 2013 11:40 pm

pwede ring ganon,additional task ng regulator circuit kong d maganda filter ng rectifier stage.pnalitan mo nba ng ecaps bago masira ulit ang 2n3055?pwde nman cgurong wlang regulator,dagdag nlng ng ecaps.magkano ba voltage ng transformer?

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Re: Booster amplifier using MJ2955

Post by Romy on Thu Jan 03, 2013 12:59 pm

papalitan ko pa lang po, wala lang available na ecaps eh. malamang nga po ung ecaps ang diperensiya nun. ang mali ko lang di muna ako nagpalit ng ecaps bago ung transistor di ko kasi napansin agad.
30-0-30 ang ac out ng trans niya. ok lang ba na ibahin ko nalang yung power supply circuit ko ung di na gagamit ng 2n3055?

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Re: Booster amplifier using MJ2955

Post by danny on Thu Jan 03, 2013 2:08 pm

bakit mo naman papalitan kung ma rerepair naman
yung power supply niya, sayang naman yung originality ng design

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Re: Booster amplifier using MJ2955

Post by ultrasonic™ on Thu Jan 03, 2013 3:55 pm


uu nga sis sayang...
mganda sana kng may diag para kita natin saan tau babanat at magmomodify

hnstly di ko masxadong masundan ang design ng amp nato
ung NA51W yata is Series V Regulator na pang low voltage na gagamitin sa VU meter, Preamp at tone control ckt. ang 2N3055 ay series pass current nmn.... tama kya ako ahahah (^_^

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Re: Booster amplifier using MJ2955

Post by Romy on Thu Jan 03, 2013 4:03 pm

ako din sir eh di ko gaanong kabisado to. original design to sir eh di ko lang alam kung my diagram yung mayari nito. ang kaso wala na xa dito samin. yung power supply niya un po ung ginamitan ng 2n3055 tsaka na51w. 30 v ang output niya sir.. di ko lang po alam kung ilang watts to.

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Re: Booster amplifier using MJ2955

Post by ultrasonic™ on Fri Jan 04, 2013 11:19 am

gawan nlng ng diagram (^_^

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Re: Booster amplifier using MJ2955

Post by danny on Sat Jan 05, 2013 12:59 pm

pwede mo reverse engineering ng konti para may
guide tayo kahit paano.
trace mo yung output ng regulator kung ano ang sinusuplayan

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Re: Booster amplifier using MJ2955

Post by james on Sat Jan 05, 2013 2:35 pm

Mukhang kulang ang 3055 mo, sa load mo. Baka 1 3055 = 5A handling capacity lang.

Mukha kasing series pass lang yung 3055.

Tanggalin mo yung takip ng sirang 3055 kung gaano kanipis ang connector nyan.

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Re: Booster amplifier using MJ2955

Post by Romy on Sun Jan 06, 2013 12:06 am

hindi po ba 5amps lang talaga yung capacity ng 3055? pwede pa po ba akong magdagdag kung sakali?parrallel connection nlng.. @ sir danny, panu po ung reverse engineering?

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Re: Booster amplifier using MJ2955

Post by danny on Mon Jan 07, 2013 12:53 pm

you will draw a schematic diagram by just looking on the actual
pcb traces and components connected.
may kahirapan pero malaki maitutulong nito

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Re: Booster amplifier using MJ2955

Post by ultrasonic™ on Mon Jan 07, 2013 4:51 pm

^ agreed... e drawing nlng sa papel sis at erereplenishment ni sir danny sa Eagle /Multisim (^_^

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Re: Booster amplifier using MJ2955

Post by danny on Tue Jan 08, 2013 1:51 pm

yup
pwede Very Happy

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Re: Booster amplifier using MJ2955

Post by Romy on Tue Jan 08, 2013 11:12 pm

sige sir pag may time subukan ko ilayout to. yung power supply lang po ba o pati yung amp?

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Re: Booster amplifier using MJ2955

Post by danny on Wed Jan 09, 2013 11:21 am

kahit power supply lang muna
tutal yun lang naman ang may sira

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Re: Booster amplifier using MJ2955

Post by DJFEL on Wed Jan 09, 2013 4:40 pm

hmmm...ok to ha...30-0-30...ngayon lang ako naka rinig nito ha..

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Re: Booster amplifier using MJ2955

Post by danny on Thu Jan 10, 2013 4:02 pm

abng mode muna tayo

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Re: Booster amplifier using MJ2955

Post by michael nierva on Mon May 06, 2013 3:06 pm

mga master baka po pwede nyo po akong matulongan about sa paggawa ng audio output transformer na booster 500 watts, kung my table po kayo nun o anumang reference na pwede kung mapgkuhaan tnks

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Re: Booster amplifier using MJ2955

Post by michael nierva on Mon May 06, 2013 3:09 pm

mga master isa pa po yung schematic diagram ng booster amp. using mj2955 12 volts and 24 volts power supply tnks

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Re: Booster amplifier using MJ2955

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