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Old 2nd March 2003, 11:53 PM   #1
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Arrow 12V Car Amplifier..

ijust read the LM383 datasheet:

http://www.eed.usv.ro/misc/mirrors/c...heet/LM383.PDF

and wondering if ican bridge as many of them (operating from the
12V. car battery) to construct a good say 100watt amp.!

is this possible?! , even using any other amp. ICs that can be bridged together (assuming its running from +12v.) to form a big
power output unit.?

thanks..
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Old 3rd March 2003, 12:06 AM   #2
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this is not a very good chip, the thd is extremely high, you only get about 3 watts out of it before u hit 1% thd with a 4ohm load... im not sure if u could bridge it multiple times, but it might jsut be easier to construct a car amp the traditional way
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Old 3rd March 2003, 12:39 AM   #3
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Quote:
Originally posted by zx3chris
this is not a very good chip, the thd is extremely high, you only get about 3 watts out of it before u hit 1% thd with a 4ohm load... im not sure if u could bridge it multiple times, but it might jsut be easier to construct a car amp the traditional way
the traditional way is a PITA! ,caz u'll need to build a good reliable
SMPS unit and that really sucks!
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Old 3rd March 2003, 04:48 PM   #4
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comeon guys..
dont u know any 12V. amp. ICs that fits into the topic??!

plz share ur knowledge...
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Old 3rd March 2003, 05:15 PM   #5
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try the TDA1554
2x22W at 13.8v

I've used these in a 4 channel car amp, and they do the job quite well. They're loud enough for me ( I run one per speaker at 4ohms, so with 4 channels you get about 80W before the distortion gets noticable when you're driving )

They aint exactly HI-FI , but then without some attention to SMPS you won't get much power at 12v.

you can bridge them if you want, you may be able to parallel them too , but my hearing means more to me than the need for more power in a tin box...

the specs claim 22W at 0.1%THD, ymmv.

ray
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Old 3rd March 2003, 10:52 PM   #6
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Quote:
Originally posted by TheFettler
try the TDA1554
2x22W at 13.8v

I've used these in a 4 channel car amp, and they do the job quite well. They're loud enough for me ( I run one per speaker at 4ohms, so with 4 channels you get about 80W before the distortion gets noticable when you're driving )

They aint exactly HI-FI , but then without some attention to SMPS you won't get much power at 12v.

you can bridge them if you want, you may be able to parallel them too , but my hearing means more to me than the need for more power in a tin box...

the specs claim 22W at 0.1%THD, ymmv.

ray
i already built a 4channel ver. of the TDA1554 Amp. , driving a 2
6x9 coaxials and 2 tweeters out of a good discman in ma car,
its really a good starting project if anyone wanna get as far as
possible from SMPS issues..

but to enlighten u, its putting 2channel x 22watt max. working in
the BTL mode .. so its already bridged therefor itcant be bridged
to get more power according to my tiny knowledge..
and the THD is 10% at full power (22watt), not as u mentioned
b4 (0.1%)...

ijust need to know any other amp. ICs that works from a 12V. source and can be bridged ,,ijust try to build the most powerful
12V amp. as possible to drive a Subwoofer..

sounds crazy but am just trying...
thanx..
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Old 4th March 2003, 01:10 AM   #7
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if you are trying to build it yourself for cost reasons, u cant beat the JBL BP powervalve series... you can get the 1200.1 for <$300 and it delivers 1400 watts continous. or the 600.1 for under $180 and it delivers 700 watts continous... definitley the best watt/dollar ratio.. also check out US amps, they are very good and underrated as well...

-chris
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Old 4th March 2003, 04:35 AM   #8
ppfred is offline ppfred  Canada
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Quote:
Originally posted by deepanger
comeon guys..
dont u know any 12V. amp. ICs that fits into the topic??!

plz share ur knowledge...

Hi,
From Zetex the ZXCD1000 is a class D audio amp that you can gang up to get up to 100W @ 4ohms, available from DigiKey. A developers kit is also available.

Try for design guidelines and App Notes

Hope your less angry now.
pf
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Old 4th March 2003, 10:13 AM   #9
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Default but to enlighten u, its putting 2channel x 22watt max. working in the BTL mode ..

yes, you are quite right , sorry it's a while since I built it, and I,ve slept since then

I should be more careful about spreading mis-information
I realised after I'd gone home that I wasn't quite right....

ray
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Old 4th March 2003, 10:42 AM   #10
Paulr is offline Paulr  United Kingdom
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Default tda7375

bridged the tda7375 gets 26watts @ 10%.....not much better, could these be parralleled to get a bit more?
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