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Author Topic: P3A amp 100 watts Help  (Read 52487 times)

Offline Engr. Dacuycoy

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Re: P3A amp 100 watts Help
« Reply #300 on: May 03, 2012, 01:22:51 PM »
meron bang espada?  ??? ;D ;D
I'm a Mechanically trained, electronic to me is just an hobby and if I can do it, so can you!
Don't get discouraged by those so called "EXPERT"! I can tell you most of the time they "TALK" only but with no practical results.
Seldom people succeed the first time, just keep on trying!

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Re: P3A amp 100 watts Help
« Reply #300 on: May 03, 2012, 01:22:51 PM »

Offline JLesterP

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Re: P3A amp 100 watts Help
« Reply #301 on: May 03, 2012, 02:25:32 PM »
sis ano problem nung unang layaout?

masyado daw malayo yung current source ng ltp sabi ni sakis, so nilapit ko yung (current source) Q3 sa (LTP) Q1 & Q2

next mod ko pala ay ilapit sa output transistor yung drivers, vbe at vas... para close na sa implementation ni AlexMM

@Engineer Dacuycoy
parehas kayo ng gamit na software ni alexmm ah, mas madali ba gamitin yan?

noob question, ok lang ba na baligtad yung zobel?
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Re: P3A amp 100 watts Help
« Reply #301 on: May 03, 2012, 02:25:32 PM »

Offline Engr. Dacuycoy

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Re: P3A amp 100 watts Help
« Reply #302 on: May 03, 2012, 02:35:27 PM »
orcad gamit ko.. ginawan ko lang ng parts  ;D
I'm a Mechanically trained, electronic to me is just an hobby and if I can do it, so can you!
Don't get discouraged by those so called "EXPERT"! I can tell you most of the time they "TALK" only but with no practical results.
Seldom people succeed the first time, just keep on trying!

Philippine Electronics Forum

Re: P3A amp 100 watts Help
« Reply #302 on: May 03, 2012, 02:35:27 PM »

Offline JLesterP

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Re: P3A amp 100 watts Help
« Reply #303 on: May 03, 2012, 08:49:45 PM »
Eto na sir final update ko...  :) After this one ibang amp naman  ;D



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Re: P3A amp 100 watts Help
« Reply #303 on: May 03, 2012, 08:49:45 PM »

Offline p®otocol

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Re: P3A amp 100 watts Help
« Reply #304 on: May 04, 2012, 12:14:54 AM »
@jlester na try ko sis yung kay alexmm ung sprint layout maganda siya kasi ung packaging mismo ng IC at component magagamit mo taz pwede ka gumawa at magsave ng macros habang naglalayout.
[nO MatTer How GiFteD yOu aRe, yOu aLonE cAnNot cHanGe tHe WorLd]

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Re: P3A amp 100 watts Help
« Reply #304 on: May 04, 2012, 12:14:54 AM »

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #305 on: May 04, 2012, 08:43:34 AM »
Mga Ka P3A elabers ano ang preferred trannies sa VAS niyo? or anong perfect match na trannies ginamit niyo sa VAS? yung nagbigay ng perfect match para sa inyo.
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline kulapo

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Re: P3A amp 100 watts Help
« Reply #306 on: May 04, 2012, 09:56:37 AM »
^ kung gagawa uli ako ng p3a gusto kong subukan, VAS at driver is 2sb649 and 2sd669, output is 2sc5200/2sa1943, kung TO-3 naman sa output mj15003/4. ;)

Offline Johannah Aleksandria

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Re: P3A amp 100 watts Help
« Reply #307 on: May 04, 2012, 10:07:54 AM »
Mga Ka P3A elabers ano ang preferred trannies sa VAS niyo? or anong perfect match na trannies ginamit niyo sa VAS? yung nagbigay ng perfect match para sa inyo.


The BD140/BD139. Ito yung gamit ko sa 4 stereo amps ko na P3A at P68 at sa P3A Class A. Highest supply ko is 42-0-42Vac.
The tranny is designed for audio reproduction.
Mura lang to compared sa iba, but even Elliot says there can be no significant difference compared to MJ15034/MJ15035 which is more expensive than the output 2SC5200/2SA1943.
The tranny is even used, which can be found on the web, for a hi-fi MOSFET amp rated at 300watts.
But be sure to use orig parts. Isipin mo palagi yung linearity, which can only be achieved from parts coming from seasoned manufacturers.
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #308 on: May 04, 2012, 10:08:42 AM »
VAS ko ngayon 2sb649 at 2sd669 Driver ko 2sc2073 at 2sa940. tumawag ako sa alexan kahapon nag inquire sa output trannies ang mjl21193 at mjl21194 tag 350 pesos each  ;)
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline Johannah Aleksandria

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Re: P3A amp 100 watts Help
« Reply #309 on: May 04, 2012, 10:18:12 AM »
VAS ko ngayon 2sb649 at 2sd669 Driver ko 2sc2073 at 2sa940. tumawag ako sa alexan kahapon nag inquire sa output trannies ang mjl21193 at mjl21194 tag 350 pesos each  ;)

2SC2073/2SA940, malabo ka ng makabili ng orig nito liban na lang cguro kung sa RS ka bibili. Parang wala din nman sila.
270 pesos ang MJL4281/MJL4302 sa RS o kaya MJ15003/MJ15004, di hamak na mas mganda.
Ang nangyari sa akin ay di na ko bumibili sa local stores ng trannies, newport lang at RS ako kumukuha. Sa nakikita ko hindi lugi, kahit online order sila, sulit pa kamo sa tunog.
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #310 on: May 04, 2012, 10:29:39 AM »
grabe na talaga nagkalat na poro peke kasi ginamitan ko ng magnifying lens walang logo sa mga ibang trannies poro model number lang. dati kasi mga lumang trannies may mga logo sa manufacturer at poro original dati sabi ng tito ko mga 1970's 80's 90's pagpasok sa 2000 up to present ngayon daw madami na replacement o peke. mahirap na ma control bakit naman kaya???  :-\ :o

yang trannies sa vas ko na 2sb469 galing sa lumang crt monitor ng computer nakahoy ko. pero original me logo sa hitachi semiconductor.
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline JLesterP

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Re: P3A amp 100 watts Help
« Reply #311 on: May 04, 2012, 10:36:20 AM »
Ok din bumili sa RS, free shipping saka mura lang din... dun sana ko bibili ng bd139 kaso wala silang bd140 kaya punta na lang ako sa newport bukas...
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Offline gorex

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Re: P3A amp 100 watts Help
« Reply #312 on: May 04, 2012, 12:16:09 PM »
jlester ano input trannies mo ginamit? akin 2N5551.
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline JLesterP

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Re: P3A amp 100 watts Help
« Reply #313 on: May 04, 2012, 12:22:13 PM »
2n5551 din :)
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Offline JLesterP

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Re: P3A amp 100 watts Help
« Reply #314 on: May 05, 2012, 02:10:51 AM »
Nilagyan ko na ng common heatsink yung vbe, vas at drivers,
kinabit ko na rin sa preamp ng jvc ax-r97 ko, medyo nawala yung ibang details, pero mas maganda parin yung sound kaysa sa orig na nakalagay sa kanya dati... smooth yung sound niya at hindi fatiguing sa tenga

75ma biased, warm lang yung heatsink after 20 minutes of normal listening (mas mainit pa yung nilalagnat  ;D)

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Offline 01110011

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Re: P3A amp 100 watts Help
« Reply #315 on: May 05, 2012, 08:00:11 AM »
^daming spagghetti oh ;D ;D  ;D
with great power comes great electricity bill

Offline 01110011

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Re: P3A amp 100 watts Help
« Reply #316 on: May 05, 2012, 08:12:07 AM »



heheheheh di magkasya yung toroid
with great power comes great electricity bill

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #317 on: May 05, 2012, 08:54:26 AM »
VAS transistor:
toshiba        2SC3423 / 2SA1360
                      fairchild       KSC3503 / KSA1381
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline Johannah Aleksandria

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Re: P3A amp 100 watts Help
« Reply #318 on: May 05, 2012, 09:16:32 AM »
Nilagyan ko na ng common heatsink yung vbe, vas at drivers,
kinabit ko na rin sa preamp ng jvc ax-r97 ko, medyo nawala yung ibang details, pero mas maganda parin yung sound kaysa sa orig na nakalagay sa kanya dati... smooth yung sound niya at hindi fatiguing sa tenga

75ma biased, warm lang yung heatsink after 20 minutes of normal listening (mas mainit pa yung nilalagnat  ;D)


Ilan ba ang voltage ng supply mo sis?
Sa nakikita ko maliit ang trafo mo, pero depende yan sa voltage. Sa voltage mo makikita ang power ng amp mo, kaya dito ka magsimula kung ilang watts ang amp at dapat tama ang pantapat mong amperage nya.
To attain the true power of your setup, the trafo's power capability should be twice the expected power of the amp based on supply voltage.
Generations come and generations go, but the world stays just the same. What has happened before will happen again.

Offline gorex

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Re: P3A amp 100 watts Help
« Reply #319 on: May 05, 2012, 09:22:07 AM »
INPUT transistor:     fairchild       2N5551
                            hitachi        2SC1775
                            toshiba        2SC2240

VAS transistor:
                            toshiba       2SC3423 / 2SA1360   
                            fairchild       KSC3503 / KSA1381
DRIVER transistor:
                            toshiba       2SC4793 / 2SA1837         
                         
OUTPUT transistor: 
                            toshiba       2SC5200 / 2SA1943=150 watts     
                                             2SC5198 / 2SA1941=100watts

For P3A trannies       ;) :) :D
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

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Re: P3A amp 100 watts Help
« Reply #319 on: May 05, 2012, 09:22:07 AM »

 

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