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Old 20th September 2012, 05:47 PM   #1
Kitax is offline Kitax  Latvia
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Default a 12v amp, looking for chip

well im kind of new here, but i would like to make a "boom box" powered by a 12v battery, and would like an output of about 25 to 50w... can anyone suggest a chip wich wouldent be hard to find, and would work for me?

also a schematic of how to apply the chip would be nice ^^
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Old 20th September 2012, 06:38 PM   #2
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tda1557 , tda 8560 .
The laterone costs more, the 1557 is cheaper and has a weeee tiny bit worse sound.
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Old 20th September 2012, 07:18 PM   #3
Vix is offline Vix  Yugoslavia
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I had built an amp based on Tda8560 during my student days. Still have it, sounds pretty good. Just give it a good PSU.
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Old 20th September 2012, 07:38 PM   #4
Kitax is offline Kitax  Latvia
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Quote:
Originally Posted by Arty View Post
tda1557 , tda 8560 .
The laterone costs more, the 1557 is cheaper and has a weeee tiny bit worse sound.
thank you
so should i use the schematic in the datasheet?

i was experimenting with tda7264, but the volume was low... was it because of low 12v power source?
http://www.datasheetcatalog.org/data...ics/mXytyq.pdf
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Old 20th September 2012, 07:40 PM   #5
Kitax is offline Kitax  Latvia
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well i'm still in my student days

umm a good PSU? mind explaining what does it stand for?
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Old 21st September 2012, 02:19 PM   #6
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powersupply unit.
stick with this ic. (8560).
Make the rail voltage close to 16 volts. Given a more or less decent speaker it will be loud.
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Old 21st September 2012, 02:54 PM   #7
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The world is your oyster. There are all sorts of amplifier chips intended for use in car audio. For example, the TDA7377 gives 2x20W or 4x6W into 4 ohm.

A clear winner on power would be the TDA1562, giving a whopping 70W. You didn't say how big your battery was. Battery life will ultimately determine what to use.

For maximum battery life, you should look at a Class D amp. There are some threads on portable boomboxes using this technology, such as this one:

The Boominator - another stab at the ultimate party machine
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Old 21st September 2012, 03:30 PM   #8
Kitax is offline Kitax  Latvia
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i think ill roll with tda8560, but i want to be sure about some things
first of all... would i need some sort of preamp, before running the signal through the chip
second of all... should i use the circuit in the datasheet?
and last... i just want to make sure that it would run just fne on 12 volts, couse the datasheet says 14.4 volts, but i guess its because thats how much car can give out with the generator running, and it runs just fine on 12 volts as well (it would be kind of stupid if speaker volume went down, when the car isnt running)
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Old 21st September 2012, 03:41 PM   #9
balerit is offline balerit  South Africa
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I would go for the TDA1557. I have designed a pcb for it and my first prototype had loud clicks on the speakers when switching it on so I added a power on delay part to the circuit to pin 11 to allow the amp to settle before the amp powered the speakers. I also designed the pcb with an opamp buffer as a preamp so no need for a separate preamp. It's a great sounding amp.

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Last edited by balerit; 21st September 2012 at 03:45 PM.
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Old 21st September 2012, 03:57 PM   #10
Kitax is offline Kitax  Latvia
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Quote:
Originally Posted by balerit View Post
I would go for the TDA1557. I have designed a pcb for it and my first prototype had loud clicks on the speakers when switching it on so I added a power on delay part to the circuit to pin 11 to allow the amp to settle before the amp powered the speakers. I also designed the pcb with an opamp buffer as a preamp so no need for a separate preamp. It's a great sounding amp.

Mac

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well actually one of the reasons why i am going with the 8560 is because local dealer doesnt have 1557, but thanks for the advice anyways...
i am still hoping for the 3 answers
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