BOOSTER AMPLIFIER (MONO) using MJ295554.324

BOOSTER AMPLIFIER (MONO) using MJ2955

Page 12 of 19 Previous  1 ... 7 ... 11, 12, 13 ... 15 ... 19  Next

View previous topic View next topic Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by arkin on Thu Jan 19, 2012 2:22 am

wow!ok diay to ako ghimo.gsaway mn gud ko sa ako cousin ky taghap ra kono ako design.pro usa ka bagol sad power nsunog nko congratulation trmer lng ako gmit[sa positive side],c1061 ang trans[w/c is too big,dba?]wla sad ko mo-apply og resistor sa emiter[i gues no need for that]no mylar or ceramics.bias is around .6-.7[mao cguro less impact at low level bounce 1 IN4007 &1 bias diode.[for thermal compensation] cgi,start nlang laing thread.post output trans4merless booster.

arkin
D Battery
D Battery

Posts: 386
Join date: 2011-12-02

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by longthrow on Fri Jan 20, 2012 9:28 am

ingon ana gyud na, naay critics.. Mad
ok ra man ang c1061, seen some amps using them as thermal comp.
purpose of emitter res is to add stability on power transistors...
for sure naka suway naka 1 or 2 or more but not all power transistors are hotter than the rest when paralleled. doubt
that happens when the other transistor/s conducts more than the rest..

in the real world, naa man gud diff ang individual transistor even though they have same part#..adding a res will compensate for that... mao ila gitawag og "emitter stabilizer".

nag post nako lain thread, can i see your otl version?

longthrow
AAA Battery
AAA Battery

Posts: 37
Join date: 2012-01-10
Age: 34
Location: cebu

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by arkin on Sun Jan 22, 2012 8:53 am

agree ko nmo ana[E.C.E gud ka,4 sur,dba?]wa sad ko ngkapoblema sa ako kay dman ko mogamit daghan trans.pra nko ng:useless ng daghan power trans.wla ko nka design O.T.L.,niadopt rko..

arkin
D Battery
D Battery

Posts: 386
Join date: 2011-12-02

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by longthrow on Mon Jan 23, 2012 3:27 pm

agree ko anang too many transistors in parallel on boosters w/c is an overkill...;just aesthetics to me

one should consider the power transistors' SOA.

ex: a booster rated 100w or 200w loading 4ohms w/ 10 or 20 transistors operated @ 12v

in reality @12v b+, max voltage swing of the transistor is near b+.
then double that w/ respect to the other half/row, total speaker voltage is around 23v peak,
therefore rms is 16Vac the "will be" actual speaker voltage. 16v into 4ohms is only 64Wrms.
(very far from expected which is 100-200w) scratch

now, on the# of transistors, we only need 64w total from it.
class ab amps has typical 70% efficiency, 30% goes into heat.
so power cunsumption is:
(64w)/(.7) = 91.43 watts
current drawn is:
(91.43w)/(12v) = 7.62Amps

using mj2955 as power outputs, according to its soa graph @ 12v has 10a capacity.
therefore @ 12v supply, a pair of genuine mj2955 is sufficient to drive a 4 ohm load.

longthrow
AAA Battery
AAA Battery

Posts: 37
Join date: 2012-01-10
Age: 34
Location: cebu

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by jimsky143 on Fri Jan 27, 2012 12:34 pm

mga sir naa koy nakit-an nga transformer,sa UPS mani nga guba na nya dako raba ni,ang pangutana pwede ba ni xa i supply sa booster?daghan mani xa ug out or ba ni...salamat daan!!

jimsky143
AAA Battery
AAA Battery

Posts: 13
Join date: 2011-11-07
Location: bohol

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by arkin on Fri Jan 27, 2012 3:51 pm

pwede,since naa mna 12v[for batery charging]dlang ko sur pla ang curent rating[depende sa power sa ups]careful lng!!when testing sa voltages,since auto trans4mer mna iya gmit,naa mga terminal ana nga high votage.try lng sad check,bsin naa label sa voltages.or bsin naa separate suply for charging[typicaly auto jud na gmit]

arkin
D Battery
D Battery

Posts: 386
Join date: 2011-12-02

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by audiologic on Sun Mar 11, 2012 12:26 am

Mga master ano ang booster tinatawag na quadro???

audiologic
AAA Battery
AAA Battery

Posts: 1
Join date: 2012-03-10

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by arkin on Wed Mar 14, 2012 11:51 am

its a 4 channel booster...

arkin
D Battery
D Battery

Posts: 386
Join date: 2011-12-02

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by jimsky143 on Wed Apr 11, 2012 10:03 am

sir Arkin ok raba ang 12 ampers nga transformer i supply sa duha ka 200W nga output transformer? Isa pajud ok raba pod kung 20 ampers ang supply nya kato rang tag 2 ka 50w ang output transformer?pero 8 ka mj2955?unsa masuggest nimo kung pila uF/V ang sa 12 ampers nga supply ug 20 ampers?ug ang iyang mga resistor?mao ba japon sa gpost sa TS?......SALAMAT!!!

jimsky143
AAA Battery
AAA Battery

Posts: 13
Join date: 2011-11-07
Location: bohol

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by arkin on Thu Apr 12, 2012 6:42 am

ok ra boster w/ mj2955 to use at least 10 amps.[my first ever boster uses below 10amps only,but still it can shake our house.konsimisyon permi ako ma2. Laughing ]So,naa kay 200w og 50w output?Mas ok pra matisting nmo f naa ba jud kaliinan ang 50 og 200 output using mj2955.same ra resistor gmiton nmo.sa 12 amp,pwede na 10,000uf/25v.[why use 50v when you only got 12v suply Very Happy ]times 2[or mas daghan pa] nlng sa 20 amps,butangi lng sad jud og 10,000uf/25v ecaps ang boster.

arkin
D Battery
D Battery

Posts: 386
Join date: 2011-12-02

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by Electro on Fri Apr 13, 2012 6:10 pm

mga master mangutana na pod ko. unsay class na belong ang booster ? nangutana man gud akong anak wala ko katubag sa iyaha Very Happy

Electro
D Battery
D Battery

Posts: 837
Join date: 2010-08-26
Age: 25
Location: Calinan Davao City

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by jimsky143 on Sat Apr 14, 2012 11:10 am

ah! kusog na d i kaayo ng 12 ampers? cge sir arkin ako ne testingan...sir pila ka diode imo marecomend ane ug pila ka ampers sa 12 ampers ug 20 ampers nga supply?dba mao manay nag convert sa ac to dc?salamat daan!

jimsky143
AAA Battery
AAA Battery

Posts: 13
Join date: 2011-11-07
Location: bohol

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by arkin on Sat Apr 14, 2012 7:18 pm

sa 12 amps,i used 8 6amp..sa 20 mas ok 40amp bridge diode nlng gmiton nmo.naa bya unta exact computation,klimot nko. Very Happy bsn mkbasa to c longthrow,mkhatag to skto computation.asta sa pangutana ni electro. Rolling Eyes

arkin
D Battery
D Battery

Posts: 386
Join date: 2011-12-02

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by arkin on Sat Apr 14, 2012 7:20 pm

electro,nangutana diay imo anak about sa boster?nbuking na noon ka pla jud imo edad. Razz

arkin
D Battery
D Battery

Posts: 386
Join date: 2011-12-02

Back to top Go down

Re: BOOSTER AMPLIFIER (MONO) using MJ2955

Post by tatikxx4 on Tue May 29, 2012 11:03 am

madali lang bah gumawa ng booster amplifier?
pasensya na sa lahat baguhan lang kasi aku!

tatikxx4
AAA Battery
AAA Battery

Posts: 8
Join date: 2012-05-29
Age: 26
Location: consolacion cebu

Back to top Go down

Page 12 of 19 Previous  1 ... 7 ... 11, 12, 13 ... 15 ... 19  Next

View previous topic View next topic Back to top

- Similar topics

Permissions in this forum:
You cannot reply to topics in this forum