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Old 1st June 2007, 12:54 PM   #1
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Default break subwoofer

i recently broke open my friends harmon kardon subwoofer(it came with his HP comp)
i want to make an amplifier for my ipod
The woofer has a rating of 12 V, 1A which i can achieve

there is an IC - BA5417 inside , it is a dual power amplifier
DATA SHEET : http://kitsrus.com/pdf/ba5417.pdf

I would like to know a schematic to use this IC for the above application one exists in the datasheet on pg. 4
but i'm not sure if it is workable

Also what sort of power consumption will this thing have

PLEASE HELP I'M A BIT NEW TO THE AUDIO PART OF ELECTRONICS
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Old 1st June 2007, 01:11 PM   #2
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What are you unsure about? Pins 3 and 5 are outputs, pins 12 and 11 are their respective inputs.

As the unit has been used as a subwoofer you might have to do something with the input circuitry or pin 9.
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Old 2nd June 2007, 06:27 AM   #3
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here is the cct diagram how should i give input, the symbols are a bit odd.

the o/p from my ipod will mean one ground termiinal and the two audio channels where will each of these wires go in the beneath given cct

also how do i introduce volume control to the circuit

please help
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Old 2nd June 2007, 07:12 AM   #4
Nordic is offline Nordic  South Africa
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the little circles with the s like symbols inside, are the inputs for the two channels, and RL is the speakers... everything elese looks easy enough...
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Old 2nd June 2007, 09:23 AM   #5
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Question power amplifier IC

i have attached the cct diagram i found about this IC BA5417
it is a power amplifier

as one can see pins 11 & 12 are input but how exactly does on give this input
i plan to give input from my ipod so there will be one ground wire and the two audio channels , where exactly do these three wires need to go
also how can i introduce volume control to the cct.

lastly the datasheet of the IC is at :

http://www.ortodoxism.ro/datasheets/rohm/ba5417.pdf

i just cant figure out what current will be needed i plan to supply 12 V (from 8 AA battery) but how much current??

Just for background this amplifier will give output to a speaker the whole project is for making a portable speker for my discman

PLEASE HELP

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Old 2nd June 2007, 09:33 AM   #6
Nordic is offline Nordic  South Africa
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You see those little fork-like symbols, those are ground...

your input from the ipod, has one ground line and the 2 channels... one going to each input, and ground going to ground...
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Old 4th June 2007, 07:21 PM   #7
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That schematic is for bridged load, using the chip as one channel with more power...
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