simple Subwoofer amplifier...

Astro Power · 20th November 2004, 04:02 PM

i need a simple design to build Amplifier
no down from 100WRMS (4 Ohm)

my part that i have

2sc5198 X8
2sa1941 X8

mje15030/1

BC639/640

it is important that will be simple.....

the quality of the sound is not matter..... the amp will work on 250HZ down 10-20HZ

thanks tamir

destroyer X · 21st November 2004, 09:36 AM

This one was an evolution of the old Australian ETI-480, and the modifications done made it good to bass Reproduction, and exactly matching your needs...100 RMS over 8 Ohms, 50 RMS over 4 ohms, and a very interesting bass.

But if you will see the Bass Square wave using some Wave Form Monitor, you will not be impressed by the 10 Hertz wave shape.

Despite of this wave shape beeing no good....sound is very nice to years.

So, for humans it will be nice.

Use around 40 Plus and 40 minus....of course you can use it from 35 to 45 volts without problem, have only to readjust the bias...or even let them work warm (better)

AKSA can be used too, it produces a very good bass also, and can produce also 100 Watts, maybe need more output transistors... 2 pairs in the place of a single pair.

If DIY, the AKSA schematic was published in this forum...the thread is:

"Hugh will let us see his AKSA 55 schematic".... go to search sector and try to find.

Many amplifiers will be good to your need, even those with 2N3055 in the output, or 2N2955/3055, using 2 pairs to be more safe.

You lucky, many others will appear, your specifications are easy to reach.

regards,

Carlos

Astro Power · 21st November 2004, 12:34 PM

thanks u hero ~ u are the one !

i will build this......

my power suplly is 38V +\ - 800VA....

i want to build two amps....

so.....

Q1=BC640
Q2=BC640
Q3=MJE15030
Q4= MJE15030
Q5=MJE15031
Q6=2SC5198 X4
Q7=2SA1941 X4

R1=?
R2=?
R3=?
R4=?
R5=?
R6=?
R7=?
R8=?
R9=?
R10=?
R11=?
R12=?
R13=0.15R 5W x4
R14=0.15R 5W x4
R15=?

D1=1N4007
D2=1N4007
D3=1N4007
D4=1N4007

C1=10uF 25V
C2=?
C3=?
C4=?
C5=?
C6=?
C7=?
C8=4700uF 63V
C9=?
C10=4700uF 63V
C11=?

thanks !

destroyer X · 21st November 2004, 01:24 PM

I like all good people in the earth, and there are good and bad people everywhere.

We have to find our matches, the ones we like.

I could not see the amplifier you told.

If you need something, that i can help, go directly to my mail and send me the schematic.

nanabrother@yahoo.com

Good luck

Carlos

Astro Power · 25th November 2004, 02:39 PM

Astro Power · 27th November 2004, 09:57 PM

how can i chack exactly the RMS of the out of amp in 2 OHM and 4 OHM

thanks

tamir

richie00boy · 27th November 2004, 10:06 PM

Hook up a dummy load, watch the output with a 'scope whilst you feed in a sinewave just below clipping. The RMS value of the sinewave is simply (peak-to-peak/2)/1.414.

20th November 2004, 04:02 PM	#1
Astro Power diyAudio Member Join Date: Sep 2004 Location: Binyamina	simple Subwoofer amplifier... i need a simple design to build Amplifier no down from 100WRMS (4 Ohm) my part that i have 2sc5198 X8 2sa1941 X8 mje15030/1 BC639/640 it is important that will be simple..... the quality of the sound is not matter..... the amp will work on 250HZ down 10-20HZ thanks tamir

21st November 2004, 09:36 AM	#2
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Search in internet SD480, or SC480 amplifier This one was an evolution of the old Australian ETI-480, and the modifications done made it good to bass Reproduction, and exactly matching your needs...100 RMS over 8 Ohms, 50 RMS over 4 ohms, and a very interesting bass. But if you will see the Bass Square wave using some Wave Form Monitor, you will not be impressed by the 10 Hertz wave shape. Despite of this wave shape beeing no good....sound is very nice to years. So, for humans it will be nice. Use around 40 Plus and 40 minus....of course you can use it from 35 to 45 volts without problem, have only to readjust the bias...or even let them work warm (better) AKSA can be used too, it produces a very good bass also, and can produce also 100 Watts, maybe need more output transistors... 2 pairs in the place of a single pair. If DIY, the AKSA schematic was published in this forum...the thread is: "Hugh will let us see his AKSA 55 schematic".... go to search sector and try to find. Many amplifiers will be good to your need, even those with 2N3055 in the output, or 2N2955/3055, using 2 pairs to be more safe. You lucky, many others will appear, your specifications are easy to reach. regards, Carlos __________________ Audiophoolery; http://www.youtube.com/watch?v=m7ERMu825m4; Dx Super Etching; http://www.youtube.com/watch?v=WED3Bvmxepk

21st November 2004, 01:24 PM	#4
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Needing help, just call me...i am at you service, i like Jewish people, clever people I like all good people in the earth, and there are good and bad people everywhere. We have to find our matches, the ones we like. I could not see the amplifier you told. If you need something, that i can help, go directly to my mail and send me the schematic. nanabrother@yahoo.com Good luck Carlos __________________ Audiophoolery; http://www.youtube.com/watch?v=m7ERMu825m4; Dx Super Etching; http://www.youtube.com/watch?v=WED3Bvmxepk

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21st November 2004, 12:34 PM	#3
Astro Power diyAudio Member Join Date: Sep 2004 Location: Binyamina	thanks u hero ~ u are the one ! i will build this...... my power suplly is 38V +\ - 800VA.... i want to build two amps.... so..... Q1=BC640 Q2=BC640 Q3=MJE15030 Q4= MJE15030 Q5=MJE15031 Q6=2SC5198 X4 Q7=2SA1941 X4 R1=? R2=? R3=? R4=? R5=? R6=? R7=? R8=? R9=? R10=? R11=? R12=? R13=0.15R 5W x4 R14=0.15R 5W x4 R15=? D1=1N4007 D2=1N4007 D3=1N4007 D4=1N4007 C1=10uF 25V C2=? C3=? C4=? C5=? C6=? C7=? C8=4700uF 63V C9=? C10=4700uF 63V C11=? thanks !

25th November 2004, 02:39 PM	#5
Astro Power diyAudio Member Join Date: Sep 2004 Location: Binyamina	destroyer X thanks u, i be arranged... u build this ! http://sound.westhost.com/project03.htm in two CH'...... and it is work wonderful..... i connect to the amp 2 ohm in bridge......(1ohm each channel) my car PWM is out a 38V +\- 1100VA (80A + on 14.4V) http://planet.nana.co.il/kokoladit/2.JPG http://planet.nana.co.il/kokoladit/3.JPG http://planet.nana.co.il/kokoladit/4.JPG http://planet.nana.co.il/kokoladit/5.JPG http://planet.nana.co.il/kokoladit/6.JPG http://planet.nana.co.il/kokoladit/7.JPG http://planet.nana.co.il/kokoladit/d.JPG http://planet.nana.co.il/kokoladit/9.JPG http://planet.nana.co.il/kokoladit/10.JPG http://planet.nana.co.il/kokoladit/11.JPG http://planet.nana.co.il/kokoladit/12.JPG http://planet.nana.co.il/kokoladit/13.JPG how can i chack exactly the RMS of the out of amp in 2 OHM and 4 OHM thanks tamir

27th November 2004, 09:57 PM	#6
Astro Power diyAudio Member Join Date: Sep 2004 Location: Binyamina	how can i chack exactly the RMS of the out of amp in 2 OHM and 4 OHM thanks tamir

27th November 2004, 10:06 PM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Hook up a dummy load, watch the output with a 'scope whilst you feed in a sinewave just below clipping. The RMS value of the sinewave is simply (peak-to-peak/2)/1.414.

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