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Old 28th November 2003, 12:44 PM   #1
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Lightbulb TDA 7294 Subwoofer

I have purchased a lots of TDA7294 chips to build a 5.1 amplifiers system that works with my creative SBLive 5.1 sound card, however, I am haivng trouble in putting up a decent Subwoofer amplifier can anyone suggets a schematic forbuilding a subwoofer amplifier with the same, schematics mentioned in the data sheet of the chips doesn't seem to work good, theres lot of oscillation.
Please help.
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Old 28th November 2003, 01:26 PM   #2
mik is offline mik
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http://subwoofer.t17.ds.pwr.wroc.pl/download.php?id=001
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Old 29th November 2003, 11:28 AM   #3
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I Have looked at the site and downloaded the PDF unfortunately it is in a language thats beyond my recognition, also schematic is not that different from that on data sheet can any1 else please help:
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Old 5th December 2003, 09:26 AM   #4
alfsch is offline alfsch  Germany
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Hi,
1. are ps caps close to the chip
2. use zobel at output (0,1uf + 5 ohm or so)

i had no problems with these chips.
alf
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Old 8th December 2003, 05:22 PM   #5
palesha is offline palesha  India
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This has been discussed many times before. Many people hv built this on this forum. I don't understand why u only is not able to get it?
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Old 13th December 2003, 02:34 PM   #6
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Well Thanxs Palesha, but certainly u don't expect a person who knows the technology as SUBWOOFER, and 5.1 digital decoding wont have datasheet of the IC, what I wanted was to have a custom designed circuit (A bridge may be) with amplification capability not across 20 Hz to 20KHZ, but with an effective range of may be 40 hz to 400 HZ.
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Old 18th December 2003, 03:36 PM   #7
palesha is offline palesha  India
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Subwoofer means it will normally cover from 20 or 30 hz to 100~150 hz depends upon the other speakers. U must first decide what speakers u r going to use for 5 channels? What will be their low frequency response & accordingly u hv to design subwoofer filter. Hope u understand this better than Mushrraf.
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