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Old 19th March 2004, 12:03 PM   #1
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Default :: 3d multimedia amplifier ::

Dear all;

I’ve finished building satellite-subwoofer amplifier for multimedia active speaker. It apply 2 chips TDA 2005, 1 in stereo mode for satellite amplifier, 1 in bridge mode for subwoofer amplifier, 2 transistors for buffer, 1 transistor for subwoofer mixer & filter. But the subwoofer amp make noise: ‘broooommmmm’. I suggest it’s low frequency oscillation.

I attached some pictures. Please give me some suggestion & help.

Regards: ragil.hastomo
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File Type: jpg cap_004.jpg (36.5 KB, 847 views)
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Old 19th March 2004, 12:06 PM   #2
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.. the filter ..
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File Type: jpg cap_003.jpg (39.6 KB, 746 views)
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Old 19th March 2004, 12:08 PM   #3
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.. bottom layer ..
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File Type: jpg cap_006.jpg (34.5 KB, 737 views)
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Old 22nd March 2004, 05:42 PM   #4
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.. helloooooouuuwwww .. anybody there? ..

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Old 22nd March 2004, 07:18 PM   #5
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do you have the schematic you used to build the amps, as it is rather difficult to tell what you have done simply from a few picturs of the circuit boards.
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Old 23rd March 2004, 02:11 AM   #6
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try disconnecting the input of the sub amp from the transistor output, and short it to ground. turn it on, and see if the hum is there. if it isn't, there is a problem with the transistors. if it is, there is a problem with the amp. check all the soldering and stuff.

-Mike
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Old 23rd March 2004, 08:58 AM   #7
palesha is offline palesha  India
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TDA 2005A is not good for mains supply operation. It is developed for auto use. It has very poor SVR (Supply Voltage Rejection). Hence put big power supply capacitors.
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Old 25th March 2004, 11:43 AM   #8
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whats the wattage of that chip? And who makes it?
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Old 25th March 2004, 04:18 PM   #9
palesha is offline palesha  India
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made by ST. It is 6 watt each channel & 20W when bridged.
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Old 26th March 2004, 01:08 AM   #10
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well, since that is such low power, why don't you just use higher power chips designed for mains operation (2 x lm1875 or 1 x lm1876 for the tweeters/midranges, and something like a 3886 for sub?
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