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Old 25th August 2004, 04:03 PM   #1
Winnie is offline Winnie  United Kingdom
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Default Suitable chip for 12 volt indoor supply

I wish to build a gainclone to operate from a single rechargable 12 volt battery indoors.

It will feed Lowther horns and therefore the output of the amp needs to be little more than 2 Watts. I see that BYOB has achieved this but can anyone point me to the right chips and a diagram.
Sound quality is paramount

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Winnie
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Old 25th August 2004, 07:37 PM   #2
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Default Re: Suitable chip for 12 volt indoor supply

Quote:
Originally posted by Winnie
I wish to build a gainclone to operate from a single rechargable 12 volt battery indoors.

It will feed Lowther horns and therefore the output of the amp needs to be little more than 2 Watts. I see that BYOB has achieved this but can anyone point me to the right chips and a diagram.
Sound quality is paramount
If sound quality is paramount, you won't be able to use the chips most gaincloners are using, like LM1875, 3875 and 3886. Minimum required voltage is 20v or +/-10v.

Perhaps a car chip amp might suit your requirements, but battery should have plenty of capacity. At least 10A. But depending on chip, sound quality might be an issue.


Carlos
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Old 26th August 2004, 10:37 PM   #3
Winnie is offline Winnie  United Kingdom
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Have BYOB discovered a chip that works on 12 volts and gives great sound, yet no-one on here knows what it is?
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Old 26th August 2004, 10:47 PM   #4
Variac is offline Variac  United States
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Who is BYOB? any links?
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Old 27th August 2004, 04:00 AM   #5
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Quote:
Originally posted by Variac
Who is BYOB? any links?

BYOB = Bring Your Own Beer -- at least here stateside
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Old 27th August 2004, 04:14 AM   #6
Junior is offline Junior  Singapore
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car chip amp. will be TDA1562 by Philip.
but is class H.

at least the power source is from the accumulator, which is clean with at least no ripple at all.

of course not to mention sound quality if you use 1562.
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Old 27th August 2004, 08:36 AM   #7
Winnie is offline Winnie  United Kingdom
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Sorry guys, guess I thought you all knew about BYOB - Bring Your Own Battery (though Beer sounds better )

http://www.mother-of-tone.com/index.htm
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Old 27th August 2004, 08:51 AM   #8
joensd is offline joensd  Germany
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Quote:
I wish to build a gainclone to operate from a single rechargable 12 volt battery indoors.
Texas Instruments are known to work with quite low supply voltages.
You might wanna check out chips like OPA548 or any other of that series. 549,541...
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Old 27th August 2004, 08:59 AM   #9
Winnie is offline Winnie  United Kingdom
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Quote:
but is class H.

Class H is not something that I've come across in Hi-Fi. It seems to be a modification of Class AB designed to reduce power consumption.
Any comments on sound quality?
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Old 27th August 2004, 11:17 AM   #10
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Quote:
Originally posted by joensd

Texas Instruments are known to work with quite low supply voltages.
You might wanna check out chips like OPA548 or any other of that series. 549,541...
TI does nto supply any data on how many watts you will get for lower voltages. They should be just a few for 12 volts.

You will also need to add a large series capacitor at the output, which may impair sound quality. Bridging two chips might be an option to solve that and get more power, but those OPA chips are not cheap.


Carlos
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