TDA7293 Based amp

silverchris · 7th June 2006, 03:17 PM

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!

richie00boy · 7th June 2006, 03:29 PM

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.

silverchris · 7th June 2006, 04:29 PM

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

silverchris · 7th June 2006, 04:37 PM

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.

chris7916 · 7th June 2006, 08:38 PM

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

silverchris · 8th June 2006, 11:35 AM

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

Wynand · 8th June 2006, 11:48 AM

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.

silverchris · 8th June 2006, 12:36 PM

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

speaker · 9th June 2006, 11:54 AM

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.

silverchris · 9th June 2006, 01:37 PM

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

7th June 2006, 03:17 PM	#1
silverchris diyAudio Member Join Date: Jan 2006 Location: Orangeville, Ontario	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!

7th June 2006, 03:29 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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7th June 2006, 04:29 PM	#3
silverchris diyAudio Member Join Date: Jan 2006 Location: Orangeville, Ontario	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

7th June 2006, 04:37 PM	#4
silverchris diyAudio Member Join Date: Jan 2006 Location: Orangeville, Ontario	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.

8th June 2006, 11:35 AM	#6
silverchris diyAudio Member Join Date: Jan 2006 Location: Orangeville, Ontario	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

8th June 2006, 11:48 AM	#7
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	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.

8th June 2006, 12:36 PM	#8
silverchris diyAudio Member Join Date: Jan 2006 Location: Orangeville, Ontario	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

9th June 2006, 01:37 PM	#10
silverchris diyAudio Member Join Date: Jan 2006 Location: Orangeville, Ontario	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