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Author Topic: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD  (Read 48749 times)

Offline Johannah Aleksandria

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #700 on: January 01, 2012, 05:31:33 PM »
Sa 8ohms 20w po ba tutunog din? pang testing lang. salamat sir tony :) :) :)

Wala ka nmang output pag wala ang output tranny eh, tignan mo ang schema.
Hindi nga kasama sa output point yung drivers mo eh.
Yung ibang design na nakakabit sa output point yung driver magkakatunog yun.
Kung gusto mong magkatunog kahit walang output tranny, kabit mo yung emitter resistor ng unang driver sa feedback line.
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #700 on: January 01, 2012, 05:31:33 PM »

Offline Pinoy_Tech

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #701 on: January 01, 2012, 09:02:34 PM »
Ah, sure bang may 1.5K dun sa emitter ng bias Servo? Kung meron man di ba mataas yung 1.5K? Tanong lang bro, di kasi ako mapalagay dun.
 

sorry po +/-81VDC voltage drop..nagkamali type kanina.measurement was taken on site sa gig. .saka sa latest update ay ginawang 10k values ng 5.6k resistors at sa trimmers na din..VAS resistor ay ibinalik sa 390 ung 200 ohm,pati na din 100ohm/2W to 1k,2W.ganun din sa biasing cuircit,maliban sa 1k trimmer...

Add ko lang, 'just want to remind all hobbyist na may error po sa latest schema dun sa part ng bias servo baka kasi may makasunod nun. Please read JB's quote for his corrections. 

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #701 on: January 01, 2012, 09:02:34 PM »

Offline tony

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #702 on: January 02, 2012, 07:20:04 AM »
Wala ka nmang output pag wala ang output tranny eh, tignan mo ang schema.
Hindi nga kasama sa output point yung drivers mo eh.
Yung ibang design na nakakabit sa output point yung driver magkakatunog yun.
Kung gusto mong magkatunog kahit walang output tranny, kabit mo yung emitter resistor ng unang driver sa feedback line.

oo nga ikabit mo yung 100ohms sa 0.33 ohms, pwede na sa headphone....

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #702 on: January 02, 2012, 07:20:04 AM »

Offline Johannah Aleksandria

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #703 on: January 02, 2012, 07:28:07 AM »
 ;D ;D ;D
Baka lalong maguluhan si sister ah.
Sige subaybay lang at matuto ka din.
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #703 on: January 02, 2012, 07:28:07 AM »

Offline tony

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #704 on: January 02, 2012, 07:42:27 AM »
Add ko lang, 'just want to remind all hobbyist na may error po sa latest schema dun sa part ng bias servo baka kasi may makasunod nun. Please read JB's quote for his corrections. 


the 1.5k resistor should be replaced by a 0ohm resistor or jumper....

the 5k trimmer resistors at the collector of the input ltp is not a good practice, "tirang daya" yan......ang tamang practice ay yung mag match ng input trannies sa input ltp stage para maiwasan ang sobrang offset voltage sa output....

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #704 on: January 02, 2012, 07:42:27 AM »

Offline BhongTech

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #705 on: January 02, 2012, 08:19:04 AM »
oo nga ikabit mo yung 100ohms sa 0.33 ohms, pwede na sa headphone....


sa tingin pwede nga kaso bagu lagyan ng headphone siguraduhin muna na na-adjust na halos zero volts ang dc offset sa output kung hindi sunog agad ang headphone ;D


Offline Johannah Aleksandria

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #706 on: January 02, 2012, 12:29:57 PM »
Sa 100ohms sobrang lakas nyan para sa headphone.
Sa full supply kayang magpatunog ng 15" speaker nyan wag lang tumagal at masunog ang resistor.
Try mong walang output trannies yung amp mo na gumagana at switch on mo saglit na may source ng music at speaker, filter caps lang ang paganahin mong mag supply ng currernt, at malaman mong malakas pa din.
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

Offline jb1_amp

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #707 on: January 05, 2012, 08:56:27 AM »
Gdam mga sis pa check nalang po kung may mali dito ito po actual pic.


Offline jb1_amp

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #708 on: January 05, 2012, 08:58:25 AM »

Offline immong72

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #709 on: January 05, 2012, 09:52:00 AM »
happy new year po sa lahat na kaelab..tanong lang po mga masters. ano po ang mas magandang gamiting power output transsistor sa uprated westrak ni sir jbmobile 1216/2922 or 1943/5200?

Offline jiggins20

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #710 on: January 05, 2012, 10:04:58 AM »
1943/5200.........
Audio amp addict

Offline BhongTech

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #711 on: January 05, 2012, 10:25:27 AM »
^ agree

Offline Disabled

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #712 on: January 05, 2012, 12:10:55 PM »
sir jb1, paki tingin nlang dito.
wala akong oras ngayon kasi may pasok pa ako ;D







Offline jb1_amp

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #713 on: January 06, 2012, 09:28:56 AM »
Ok sir hengilbert salamat sa pic. ;D

Offline jb1_amp

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #714 on: January 06, 2012, 09:44:51 AM »
Sir gamit mo po ba 2sa940/2sc2073 malapit sa input? Ang gamit ko po kasi tip42/41 di kya ito ang my problem?   

Offline tony

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #715 on: January 06, 2012, 10:49:47 AM »
ano rail voltages mo? Vceo of the TIP41/42C is only 100volts, therefore, using those on rails greater than 50 volts is a big gamble.... ;)

Offline Disabled

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #716 on: January 06, 2012, 12:32:47 PM »
Sir gamit mo po ba 2sa940/2sc2073 malapit sa input? Ang gamit ko po kasi tip42/41 di kya ito ang my problem?   
all the way ay TIP41C/TIP42C lang gamit ko :)

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #717 on: January 06, 2012, 08:50:27 PM »
nakatengga lang ung dalawang boards ko dito ngayon :D

Offline BhongTech

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #718 on: January 07, 2012, 05:03:23 AM »
paarbor na yan sir... ;D

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #719 on: January 07, 2012, 07:00:27 AM »
;D ;D ;D

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Re: WESTRAK AMP NA 500 WATTS @ 8 OHMS LOAD
« Reply #719 on: January 07, 2012, 07:00:27 AM »

 

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