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Author Topic: 400watts amp:from indonesia, imitated by westrak philippines  (Read 86490 times)

Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #180 on: December 26, 2009, 08:43:53 AM »
Quote
ano po ang difference ng ordinary leach amp at super leach amp?

ang Leach super amp gumamit ng series connected output trannies, dahil noong time na idesign ni prof. leach yung amp, mj15003/mj15004 pa lang ang available na complimentary output power....hindi kakayanin ng mj15003/15004 ang rail voltages na +/85 volts...

yung VAS, or voltage amplifier stage ng super amp ay naka series din, tipong cascode, at ang dahilan any para mai-swing yung output stage at magamit yung full rail voltages para makakuha ng maximum output...

walang pinagkaiba yung input stage....

yung mga huling versions, gumamit ng feed-forward feedback arrangement....layunin nito na maiwasan ang sobrang delay ng feedback voltage sa high frequencies.....sa mataas ng frequencies, ang feedback ay kinukuha sa driver stage sa halip na sa output stage....yung back emf galing sa speakers ay iniiwasan na maicouple sa input long tail...

i have built several of this amps at talga naman na masarap pakinggan, hindi nakakaumay ang tunog kahit pa high volume..
audio power amps are also subject to the laws of thermodynamics, there is no escaping it....
do not judge any amp by its schematics, drawing lang yon, look instead at the as built amp, it tells volumes.....
http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-12.html
http://ronelex.com/bias-current-output-transistor-amplifier/156/

Philippine Electronics Forum

Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #180 on: December 26, 2009, 08:43:53 AM »

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #181 on: December 26, 2009, 09:40:30 AM »
i agree with that sir tony. i have read all the description of leach amp. from all its revision up to the updated version,i really like how professor leach explain his idea regarding leach amp and his double barrelled amp(leach superamp) that is why im preparing to have power transformer for this amp.and to use mj15024/25 for this amp instead of mj15003/04...

picture above is the leach super amp built by my friend.i dont care for any comments  for how he did those nasty wirings,,,cheersssss
pinakapogi sa lahat...walang kokontra,.....

Philippine Electronics Forum

Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #181 on: December 26, 2009, 09:40:30 AM »

Offline danny

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #182 on: December 26, 2009, 09:56:30 AM »
sir danny ano po ang difference ng ordinary leach amp at super leach amp?

sori just log in,  :)
sir tony explained it na.

yes, yung output ang pinaka highlight nito
yung input ay parehas din

by the way, you can always refer to the previous schematic
posted on his site, he also pointed out yung mga nabago
thanks.
danny

Philippine Electronics Forum

Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #182 on: December 26, 2009, 09:56:30 AM »

Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #183 on: December 26, 2009, 10:17:36 AM »
dapat siguro magkaroon ng dedicated na Leach amps dito....mukhang marami na rin ang nakagawa nito...
audio power amps are also subject to the laws of thermodynamics, there is no escaping it....
do not judge any amp by its schematics, drawing lang yon, look instead at the as built amp, it tells volumes.....
http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-12.html
http://ronelex.com/bias-current-output-transistor-amplifier/156/

Philippine Electronics Forum

Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #183 on: December 26, 2009, 10:17:36 AM »

Offline danny

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #184 on: December 26, 2009, 10:25:05 AM »
that is a good idea  :)
danny

Philippine Electronics Forum

Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #184 on: December 26, 2009, 10:25:05 AM »

Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #185 on: December 26, 2009, 05:04:33 PM »
for those interested in the Leach amp upgrades by jens rasmussen at diyaudio, here is a link containing all information you will need to construct this amp.....http://web.archive.org/web/20080510170113/delta-audio.com/Leach-Clone.htm

there is an upcoming group buy at diyadio: http://www.diyaudio.com/forums/group-buys/155054-leach-amp-pcb-group-buy-interest-2.html#post2024751

 
audio power amps are also subject to the laws of thermodynamics, there is no escaping it....
do not judge any amp by its schematics, drawing lang yon, look instead at the as built amp, it tells volumes.....
http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-12.html
http://ronelex.com/bias-current-output-transistor-amplifier/156/

Offline dan.enriquez

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #186 on: December 26, 2009, 11:28:48 PM »
^ hindi naman boss very memorable kasi tong thread na to.mainit ang discussion.

sayang di ko post yung ginawa kong amplifier using MOSFET as final amplifier driver output.nasa pilipinas kasi yung diagram at specs nun,pati rin yung picture nung actual unit.
"Ang Taong Walang Tiwala Sa Kapwa Ay Wala Ring Tiwala Sa Sarili" - ate mwah

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #187 on: December 26, 2009, 11:53:19 PM »
^ hindi naman boss very memorable kasi tong thread na to.mainit ang discussion.

sayang di ko post yung ginawa kong amplifier using MOSFET as final amplifier driver output.nasa pilipinas kasi yung diagram at specs nun,pati rin yung picture nung actual unit.


same here, i made a lot of amps there in phil. wala nga ako makutkot dto na electronics di katulad jan sa atin, what im doing right at this very moment is to buy computer grade capacitors and mj15003/4 mj15024/25 on ebay...its a lot of selection and theyre free shipping from hongkong from allpartspipe...check it out brother.....
pinakapogi sa lahat...walang kokontra,.....

Offline kulit06

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #188 on: December 27, 2009, 03:54:25 AM »
 ??? paki define nga po yung double barrel,salamat po!pasensya na po sa wala pang alam ;D

Offline danny

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #189 on: December 27, 2009, 03:54:59 AM »
anak ng mga impakta bakit naging chit-chat na ito  ;D ;D ;D
wag kayo magmana kay impakta 7, XNA_7

anyway, I am trying to finish an amplifier nde ako may design it was
designed by my other friend.
hopefully to finish it by 2010. The output stage
is a totem pole I will post it on a different thread
pag nasimulan ko na  :)
danny

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #190 on: December 27, 2009, 07:41:15 AM »
??? paki define nga po yung double barrel,salamat po!pasensya na po sa wala pang alam ;D

ito yung sinasabi kong double barrelled amp

http://users.ece.gatech.edu/mleach/superamp/        okay ba yan mate?
pinakapogi sa lahat...walang kokontra,.....

Offline tony

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audio power amps are also subject to the laws of thermodynamics, there is no escaping it....
do not judge any amp by its schematics, drawing lang yon, look instead at the as built amp, it tells volumes.....
http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-12.html
http://ronelex.com/bias-current-output-transistor-amplifier/156/

Offline jiggins20

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #192 on: December 27, 2009, 01:07:13 PM »
sir tony double barrelled po ba ung amp mo?
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Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #193 on: December 27, 2009, 04:45:14 PM »
sir tony double barrelled po ba ung amp mo?

yup, yan yung version na nakapublish sa Audio magazine, circa 1980....
audio power amps are also subject to the laws of thermodynamics, there is no escaping it....
do not judge any amp by its schematics, drawing lang yon, look instead at the as built amp, it tells volumes.....
http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-12.html
http://ronelex.com/bias-current-output-transistor-amplifier/156/

Offline pilyo168

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #194 on: December 27, 2009, 07:54:00 PM »
westrak pcb's

P150 each













pm lang para sa mga gusto mag order.

payments thru bpi bank, to be delivered thru air21.
If you dont feel your bass. Your subwoofer sucks.

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #195 on: December 27, 2009, 11:56:39 PM »
westrak pcb's

P150 each





sir pilyo reserve mo yun sa akin sampung piraso...okay?











pm lang para sa mga gusto mag order.

payments thru bpi bank, to be delivered thru air21.

sir pilyo reserve moyung sakin sampu piraso okay?
pinakapogi sa lahat...walang kokontra,.....

Offline jiggins20

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #196 on: December 27, 2009, 11:59:30 PM »
2 pcs lang po ang sa akin....para stereo...
Audio amp addict

Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #197 on: December 29, 2009, 12:29:19 PM »
i agree with that sir tony. i have read all the description of leach amp. from all its revision up to the updated version,i really like how professor leach explain his idea regarding leach amp and his double barrelled amp(leach superamp) that is why im preparing to have power transformer for this amp.and to use mj15024/25 for this amp instead of mj15003/04...

picture above is the leach super amp built by my friend.i dont care for any comments  for how he did those nasty wirings,,,cheersssss

not to be critical but i see that "grounding" can still be improved......if i were to wire this amp, i would have done it differently....:)
audio power amps are also subject to the laws of thermodynamics, there is no escaping it....
do not judge any amp by its schematics, drawing lang yon, look instead at the as built amp, it tells volumes.....
http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-12.html
http://ronelex.com/bias-current-output-transistor-amplifier/156/

Offline danny

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #198 on: December 29, 2009, 12:34:35 PM »
I couldn't find the star ground  :)
danny

Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #199 on: December 29, 2009, 01:37:28 PM »
there is none......and that is my point.....the full potential of the amp will reveal itself more if star grounding is properly implemented....
audio power amps are also subject to the laws of thermodynamics, there is no escaping it....
do not judge any amp by its schematics, drawing lang yon, look instead at the as built amp, it tells volumes.....
http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-12.html
http://ronelex.com/bias-current-output-transistor-amplifier/156/

Philippine Electronics Forum

Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #199 on: December 29, 2009, 01:37:28 PM »

 

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