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Old 2nd April 2011, 04:16 PM   #1
camus is offline camus  Spain
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Location: solderland
Default Help for recycled 5.1 Amp

The home theater system was given to me by a friend who said it did not work and was about to throw it all away. After the first inspection, I noticed the PCB was of very poor quality and had cracks, thus I decided to recycle the components that were good and build my own 5.1 amp to use with my computer.

I tried to simplify the design as much as I could as I am not looking for a HI-FI system, just something to listen to music and watch movies on my PC.
I also tried to follow the original design as much as I could to avoid getting new parts.

Currently I have a few doubts that I hope someone can help me with.

1-Not sure if the two fuses (F02 AND F03) go before the rectifier as drawn or actually need to be placed at the very end after the capacitors (C1 & C2).

2-After reading much about the subject in the forums, I am confused about grounding the 0V line to the metal chassis, as there wasn't such a connection in the original design and also working at 220V 50Hz with no ground connection, I am not sure what would happen or its even advisable.

3-As for the rest of the system (the actual amp) disregard the 12V rating on the caps, I just copied the design from the IC manufacturer and haven't calculated what I really might need to use.

4-Also any ideas on how to best split the signal on Amp3 (sub woofer and Center channels) would be appreciated.

Again, any help, suggestion or comment is welcomed.
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Old 3rd April 2011, 02:26 PM   #2
johnr66 is offline johnr66  United States
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The fuses are shown across the rail making a short circuit. The position is fine before the rectifier. I can't make out the chip in use TDA-something it looks like.
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Old 3rd April 2011, 04:39 PM   #3
camus is offline camus  Spain
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Join Date: Apr 2006
Location: solderland
Quote:
Originally Posted by johnr66 View Post
The fuses are shown across the rail making a short circuit. The position is fine before the rectifier. I can't make out the chip in use TDA-something it looks like.
Thanks! I just realized that the hard way, I stupidly made the connections with the power on. As a result I got a blown fuse and a very loud explosion from a blown cap (ears still ringing)

I am also a little concerned as when I started plugin the AC mains one by one, when I had two connected (+17V -0V) the toroidal started humming. As I was surprised by this, I took the multimeter and once I touched one of the mains, the capacitor and fuse blew.

The Amp is a TDA7264, sorry I didn't realize the picture looked so small. I'll put it in PDF so one can zoom in.
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File Type: pdf amplificador1_1.pdf (22.7 KB, 12 views)
File Type: pdf TDA7264II.pdf (125.6 KB, 9 views)
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