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Chip Amps Amplifiers based on integrated circuits

Unidentied PCB
Unidentied PCB
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Old 7th September 2008, 08:22 AM   #1
sivan_and is offline sivan_and  India
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Default Unidentied PCB

This is a PCB i got from a junk shop, contains all components like rectifier, filter and mostly all components needed for a power amplifier except the IC. looking closely this is wired in bridge mode (BTL) the IC has 14 pins
Pins description:
Pins 1,8,10,13 ground.
7 +Vcc.
3 inv i/p
2 non inv i/p (the input signal is given here.
4 & 11 output (BTL)
will post full details if needed
and in true DIY spirits i decided to make a powered speaker for my ipod, and i did search the web (Google) with no results regarding the IC used.Any help in identifying the IC will be appreciated thanks in adv
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Old 8th September 2008, 05:12 AM   #2
sivan_and is offline sivan_and  India
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no responce ( ??????????)
i think i will have to post pics and more details
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Old 8th September 2008, 06:06 AM   #3
danielwritesbac is offline danielwritesbac  United States
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I like to enter my guess in the lottery. . . a somewhat under-volted stereo automotive chip amplifier from ST Thompson?

Anyway, a magnifying glass and a flashlight could possibly let you read the details right from the chip itself.

EDIT: Next guess would be a slightly big op amp, such as used to power computer speakers. Although, if you were really, really lucky, its something from MPS, but I think nobody is lucky enough to find a bridged MPS MP7720 or something like that.
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Old 8th September 2008, 07:01 AM   #4
sivan_and is offline sivan_and  India
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The chips were missing from the pcb and the supply volts is 12V.most probably the IC is LA series from Sanyo as am told.
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Old 8th September 2008, 07:19 AM   #5
sivan_and is offline sivan_and  India
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Some pics...
Attached Images
File Type: jpg dsc_0931.jpg (26.8 KB, 392 views)
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Old 8th September 2008, 07:25 AM   #6
sivan_and is offline sivan_and  India
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.....
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File Type: jpg dsc_0933.jpg (22.7 KB, 387 views)
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Old 8th September 2008, 09:30 AM   #7
east electronics is offline east electronics  Greece
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Default there is a possibility

that these boards are made for LA4705N-08N family please check existing schematics allover the net
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Old 8th September 2008, 06:13 PM   #8
sivan_and is offline sivan_and  India
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No....the pin numbers r different..Thanx anyway for the reply !!!
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Old 16th October 2008, 02:53 PM   #9
sivan_and is offline sivan_and  India
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Finally..i got the answer from WWW wide goose chase...
its LA3508 dual ch amp. the circuit is in BTL mode..
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