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Old 19th February 2009, 01:40 PM   #1
raghs is offline raghs  India
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Join Date: Nov 2008
Default La4440

Hi All,

I am new to this forum and have a query related to LA4440.

I have a car tape which supports Pendrive, memory card, radio & Aux input. The unit has TDA2003 chip, as a basic amplifier. But even at full volume the speakers just whisper. Is it that the TDA2003 might not be functional??

I bought a small amplifier kit based on LA4440 bridged amp with a pre-amp & bass/treble circuit. Now my doubts are as follows:
1) The chip requires 12V 3A, can I connect it to a car battery (12 V 5 A)? Do I need to use fuse?
2) If I intend to use my above mentioned car tape as input to the pre-amp, then do I need to use capacitor as filter?
3) Should I or Should I NOT use the preamp?
4) Will the LA4440 be able to drive my subwoofers?
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Old 19th February 2009, 10:53 PM   #2
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Join Date: Jul 2003
Location: Doerun, GA
The TDA 2003 should provide reasonable volume at normal speaker loads. Two of them bridged with 12V supply will provide about 14W output, and they can make good sounding 12V IC amps. It sounds like there may be a problem with yours.

I'm not familiar with the LA4440, but...

1) Yes, battery connection is fine but it MUST be fused as close to the battery connection as possible. Be sure there is a provision to turn the amp on/off with the tape or ignition, otherwise the amp will stay on full-time and drain your battery.

2) As in series cap for DC blocking? Depends on the tape's output and the kit amp's input arrangement.

3) How could you resist giving it a try?

4) Well, it probably can depending on the impedances. However, I wouldn't expect too much from them.
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Old 14th November 2009, 09:15 PM   #3
shuvra is offline shuvra  Singapore
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Join Date: Oct 2009
i want to use 2 la4440 identical bridge circuit to get 19w+19w=38w on a single speaker.pls help.
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Old 14th November 2009, 10:29 PM   #4
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Join Date: Jul 2003
Location: Doerun, GA
The LA4440 is a stereo amp, so it could be bridged into a single channel, but you couldn't combine two 4440's into a single channel. You won't quite get 19W out of one if running on 12V (or 13V or 14V...)

You could use two in bridged mode to power a dual voice coil speaker at about 14W per coil max.
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