Unidentied PCB

sivan_and · 7th September 2008, 08:22 AM

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

sivan_and · 8th September 2008, 05:12 AM

no responce ( ??????????)
i think i will have to post pics and more details

danielwritesbac · 8th September 2008, 06:06 AM

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.

sivan_and · 8th September 2008, 07:01 AM

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.

sivan_and · 8th September 2008, 07:19 AM

Some pics...

sivan_and · 8th September 2008, 07:25 AM

.....

sakis · 8th September 2008, 09:30 AM

that these boards are made for LA4705N-08N family please check existing schematics allover the net

sivan_and · 8th September 2008, 06:13 PM

No....the pin numbers r different..Thanx anyway for the reply !!!

sivan_and · 16th October 2008, 02:53 PM

Finally..i got the answer from WWW wide goose chase...
its LA3508 dual ch amp. the circuit is in BTL mode..

7th September 2008, 08:22 AM	#1
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	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 __________________ SivanandBalan

8th September 2008, 05:12 AM	#2
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	no responce ( ??????????) i think i will have to post pics and more details __________________ SivanandBalan

8th September 2008, 07:01 AM	#4
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	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. __________________ SivanandBalan

8th September 2008, 09:30 AM	#7
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	there is a possibility that these boards are made for LA4705N-08N family please check existing schematics allover the net __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

8th September 2008, 06:13 PM	#8
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	No....the pin numbers r different..Thanx anyway for the reply !!! __________________ SivanandBalan


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8th September 2008, 06:06 AM	#3
danielwritesbac diyAudio Member Join Date: Nov 2007	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.

16th October 2008, 02:53 PM	#9
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	Finally..i got the answer from WWW wide goose chase... its LA3508 dual ch amp. the circuit is in BTL mode.. __________________ SivanandBalan

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