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Old 7th June 2006, 04:17 PM   #1
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Default TDA7293 Based amp

Hi I am in the proccess of building a amp based on the TDA7293. I am planning on using 2 per channel. I was wonder how do people that used them think they sound? This is my first DIY build and it is using mostly salvaged components from an old amp. I probably don't have enough filtering in the PS because I am only using 2 10000 uf caps. But I plan on doing upgrades to it after I am done building it. it is probably gonna have alittle bit over 60V power rails. These little chips are a pain in the *** to desolder any tips?
Thanks,
Silverchris

BTW: This looks like a great site so far!
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Old 7th June 2006, 04:29 PM   #2
Did it Himself
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I don't think you really want to use 2 per channel? That would mean 4 chips for a stereo amp.

10,000uF PSU is fine.

After having used desolder braid I would never attempt desoldering with out it now.
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Old 7th June 2006, 05:29 PM   #3
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This is what I am using for a schematic. Exept with only 2 of them instead of the three. I have tried desoldering braid on them but it is still being a PITA lol. I guess it will be a fight all the way with them. That is good to here about the PSU
Thanks,
Silverchris
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Old 7th June 2006, 05:37 PM   #4
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Woops the transformer I am using is only a 25-0-25 lol and I cant see why when it is rectified it comes out to around 70 but that is for another thread.
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Old 7th June 2006, 09:38 PM   #5
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Quote:
Originally posted by silverchris
Woops the transformer I am using is only a 25-0-25 lol and I cant see why when it is rectified it comes out to around 70 but that is for another thread.
Maybe because 50 (i.e. 25+25) * sqr(2) = 70.7 ?

Hope it helps

Christian
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Old 8th June 2006, 12:35 PM   #6
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ah thanks. I was searching for that formula but couldn't get the search terms right. I was just thinking is that to much power for this chip? DataSheet
Sorry this is my first build and I don't want to blow anything up
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Old 8th June 2006, 12:48 PM   #7
Wynand is offline Wynand  South Africa
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I just downloaded the PDF. It says up to +-50V rails so you are ok.

P.S. look in the PDF from ST, there are some PCB layouts for you to use.
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Old 8th June 2006, 01:36 PM   #8
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I am doing this first test on perf board to see if i like it then I might buy a eching kit from rat shack. Working on the PSU now
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Old 9th June 2006, 12:54 PM   #9
speaker is offline speaker  United States
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Quote:
Originally posted by silverchris
This is what I am using for a schematic.
I am blind I guess, I see no way to download your schematic.

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Old 9th June 2006, 02:37 PM   #10
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Lets Try again This is what I am planning on building. I guess if I want more power all i need to do is get a bigger transformer and more chips and heatsinks
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