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Old 20th November 2004, 04:02 PM   #1
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Location: Binyamina
Default 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
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Old 21st November 2004, 09:36 AM   #2
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Location: Recife - Brasil Northeast
Default 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
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Old 21st November 2004, 12:34 PM   #3
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thanks u hero ~ u are the one !

Click the image to open in full size.

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 !
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Old 21st November 2004, 01:24 PM   #4
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Location: Recife - Brasil Northeast
Default 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
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Old 25th November 2004, 02:39 PM   #5
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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
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Old 27th November 2004, 09:57 PM   #6
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how can i chack exactly the RMS of the out of amp in 2 OHM and 4 OHM

thanks

tamir
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Old 27th November 2004, 10:06 PM   #7
Did it Himself
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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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