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Author Topic: 400watts amp:from indonesia, imitated by westrak philippines  (Read 91259 times)

Offline rogerjuvy

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400watts amp:from indonesia, imitated by westrak philippines
« on: August 18, 2009, 03:42:11 PM »



         mga bro andito amplifier kung gusto nyo, natry ko na eto with some modifications. pwedeng pwede ito pang mobile kung gusto nyo. welcome any comments..............enjoy the circuit
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400watts amp:from indonesia, imitated by westrak philippines
« on: August 18, 2009, 03:42:11 PM »

Offline amp

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #1 on: August 18, 2009, 04:07:00 PM »
what is the specification of the power transformer of that amp? rating, rms volatage?

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #1 on: August 18, 2009, 04:07:00 PM »

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #2 on: August 18, 2009, 04:19:03 PM »
transfo 50vx2 1000va or in short use 20 amperes
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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #2 on: August 18, 2009, 04:19:03 PM »

Offline amp

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #3 on: August 18, 2009, 04:27:06 PM »
talagang malakas kung sa 1.849 ohm load impedance speaker. hindi kaya mo toasted ang speaker mo nyan?

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #3 on: August 18, 2009, 04:27:06 PM »

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #4 on: August 18, 2009, 04:31:43 PM »
di ko pa ginamit sa less than 4 ohm eto sir pero natry ko na din ito i bridge talagang halos lumuwa ang buong speaker cone ko na 1000watts,but ang original westrak nito used only 12amp transfo and 10000uf filter.mine i used 20 amp and 2X 37000uf tank capacitor and kbpc35diodes
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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #4 on: August 18, 2009, 04:31:43 PM »

insomartin

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #5 on: August 18, 2009, 04:34:56 PM »
@rogerjuvy

do you have some pictures? sna makita namin yung gawa na. i'm so interested!  ;D ;D ;D

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #6 on: August 18, 2009, 04:41:06 PM »
ala name picture kasi nasa pinas eh,and besides im here in US for more than 3years,but if you have a westrak amp it is more or less similar to that,im 100%sure this is working circuit,but again theres some modifications i did like replacing all b649 and d669 with tip41/42c and bc546/bc556 with mpsa42/92 and some of its components to make it more stable
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Offline audiomachines

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RMS Sound System Rental and ProAudio Equipment Repair/Speaker Repair

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #8 on: August 19, 2009, 12:59:24 AM »
thanks audiomachine, nawala ung in post ko dito na image...
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Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #9 on: August 19, 2009, 01:04:39 AM »
pinakapogi sa lahat...walang kokontra,.....

Offline jiggins20

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #10 on: August 23, 2009, 04:40:48 PM »
may nakagawa na po ba ng pcb layout nito?
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Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #11 on: November 30, 2009, 08:55:15 AM »
meron ako na pcb lay out nyan.... i got it from one of the member of diyaudio from spain.  ;D ;D ;D
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Offline jiggins20

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #12 on: November 30, 2009, 09:01:42 AM »
pahingi nman po sir....hehehe...jigsatrow@yahoo.com dats my email add
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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #13 on: November 30, 2009, 11:43:27 PM »
transistorize ano recommended na power supply nya regulated ba? ilang uf kailangan niya para sa filter cap?
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Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #14 on: December 07, 2009, 08:50:56 AM »
this amp is actually a 200watt amp at 8 ohms and 400w at 4 ohms....

how come?

1. rails are at +/-70 volts, therefore assuming 2.5 volts power transistor saturation, the maximum peak to peak output volts is therefore +/- 67.5 volts.
2. assuming that the power transformer voltage drops another 5 volts at full power, then the rails drop further to  +/- 62 volts...
3. and so the maximum rms output volts with an 8 ohm resistor load is about 44 volts r.m.s...
4. this is equivalent to 240 watts.....depending on the how big your power transformer is, this fugure can be lower....
5. at 4 ohms load, power should theoretically double, but in reality it does not, because your power transformer may not be big enough to support such power.
6. and even if your power transformer is big enough, there is another consideration, that is how efficient is your heatsink in removing heat generated. what is the SOA? is your output transistor pairs enough to handle the 4 ohm load?
* you simulate a circuit because you know how it works and wants to tweak,
not because you want to learn how that circuit works....
simulations do not teach you to be circuit smart...it comes with experience....
*audio power amps are also subject to the laws of thermodynamics, no escaping it....
*do not judge any amp by its schematics, drawing lang yon, look instead at the finished amp,
 it tells a lot about the amp and its builder.....
http://ronelex.com/bias-current-output-transistor-amplifier/156

Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #15 on: December 07, 2009, 08:52:53 AM »
transistorize ano recommended na power supply nya regulated ba? ilang uf kailangan niya para sa filter cap?

if you want to do regulated power supply, then you will end up having two amplifiers in one...my take is that if you really want power, then go for biggest traffo you can have....
* you simulate a circuit because you know how it works and wants to tweak,
not because you want to learn how that circuit works....
simulations do not teach you to be circuit smart...it comes with experience....
*audio power amps are also subject to the laws of thermodynamics, no escaping it....
*do not judge any amp by its schematics, drawing lang yon, look instead at the finished amp,
 it tells a lot about the amp and its builder.....
http://ronelex.com/bias-current-output-transistor-amplifier/156

Offline rogerjuvy

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #16 on: December 07, 2009, 11:10:45 AM »
this amp is actually a 200watt amp at 8 ohms and 400w at 4 ohms....

how come?

1. rails are at +/-70 volts, therefore assuming 2.5 volts power transistor saturation, the maximum peak to peak output volts is therefore +/- 67.5 volts.
2. assuming that the power transformer voltage drops another 5 volts at full power, then the rails drop further to  +/- 62 volts...
3. and so the maximum rms output volts with an 8 ohm resistor load is about 44 volts r.m.s...
4. this is equivalent to 240 watts.....depending on the how big your power transformer is, this fugure can be lower....
5. at 4 ohms load, power should theoretically double, but in reality it does not, because your power transformer may not be big enough to support such power.
6. and even if your power transformer is big enough, there is another consideration, that is how efficient is your heatsink in removing heat generated. what is the SOA? is your output transistor pairs enough to handle the 4 ohm load?


 thats very correct sir, i agree with that explanation...cheers
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Offline tony

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #17 on: December 08, 2009, 01:52:20 PM »
ohh...before i forget, it is never a good practice to allow your output transistors to saturate, this is how tweeters get fried....also ripples from the power supply gets coupled to your speakers this way....

never allow your amps to clipp.....clipping os bad for your speakers....
* you simulate a circuit because you know how it works and wants to tweak,
not because you want to learn how that circuit works....
simulations do not teach you to be circuit smart...it comes with experience....
*audio power amps are also subject to the laws of thermodynamics, no escaping it....
*do not judge any amp by its schematics, drawing lang yon, look instead at the finished amp,
 it tells a lot about the amp and its builder.....
http://ronelex.com/bias-current-output-transistor-amplifier/156

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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #18 on: December 08, 2009, 02:06:55 PM »


yan ang gagawin ko para sa subwoofer ko. ok ba sya?
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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #19 on: December 08, 2009, 02:07:32 PM »
500watts pala siya
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Re: 400watts amp:from indonesia, imitated by westrak philippines
« Reply #19 on: December 08, 2009, 02:07:32 PM »

 

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