TDA8947J 50X4 Channel amplifier - diyAudio
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Old 11th February 2007, 02:58 PM   #1
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Join Date: Jan 2004
Location: Bombay
Wink TDA8947J 50X4 Channel amplifier

Last month my friend gave me a Logitech subwoofer with 2 satellites model number M30 which sounds pretty good ,
here is the link to the original Logitech

http://tinyurl.com/36y4yp

so I decided to copy it , as I liked the mid and the high frequency response of the satellites , also the sub sounded good enough , and decided to build a 4 channel amplifier as it has 50 x 4 just for satellites and I brought the chip from the nearest Philips chip importer for around 2 $ and infact brought 10 chips and designed the PCB in protel DXP which I am used to it by now, but now the amp doesnít work as expected , donít know the reason it could be ,I am missing the key factors that support the amplifier from turning on , which is the mute ,stand by and the on state , here is the link to the TDA 8947j By Philips ,

http://tinyurl.com/2rhqkc

and here is the dsign of the pcb


need help !
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Old 11th February 2007, 07:36 PM   #2
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Join Date: Feb 2007
Location: Ljubljana, Slovenia
Try with 470nF at signal.
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Old 12th February 2007, 01:11 AM   #3
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Join Date: Jan 2004
Location: Bombay
I have tried the 470nF but6 no success ,it could be the voltage i have to apply on the pin mode 1 IS INCORRECT , some one who can program a pic so that i can switch between ,mute,stand by and on state ,it would be helpfull
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