PSU using TDA2040 ?

poynton · 15th May 2006, 12:05 PM

Hello All.

I found the following cicuit which I would like to use.

Could a power amp such as TDA2040 [ or 2030/2050 ] be used?

Or can anyone suggest an alternative opamp?

thanks.

Andy

Wynand · 15th May 2006, 12:16 PM

If the reason that you want to use this circuit is because you want +-15v from a higher voltage(like the rails of a amp) why not look at this: project #102 from ESP

http://www.sound.westhost.com/project102.htm

You can still regulate it afterwards

steinchen · 15th May 2006, 04:44 PM

more than 20V across the regulators will produce a huge amount of heat, I'd rather pick a transformer with 18V secondaries, 3V across the regs is sufficient

how many amps does your TDA2040 amp draw ?

poynton · 15th May 2006, 05:30 PM

Quote:

Originally posted by steinchen
more than 20V across the regulators will produce a huge amount of heat, I'd rather pick a transformer with 18V secondaries, 3V across the regs is sufficient

how many amps does your TDA2040 amp draw ?

Hi.
To avoid confusion...

I intend to use the psu to provide +-12v at about 0.25 - 0.5a max and in single end mode +5v at 0.35A.

I have a stack of the TDA2040 chips and as they basically are a form of op-amp, could they be used in place of the power opamp in the diagram?

I have been told that this type of psu gives low noise - true?

Transformer voltages, preregulators will be adjusted accordingly.

Andy

consort_ee_um · 15th May 2006, 07:46 PM

The TDA2040 will be unstable because of the low gain needed.
Why not use a 7812 and 7912?

jakaj · 10th February 2012, 02:27 PM

I recently blew my Vox Pathfinder 15r transformer - I am using the tda2040 - and from what I am reading I should use a 12-0-12 40Va, to get +/- 17v - the problem is I have very little idea what that means, and I would like to buy the right (not to expensive) PSU for the amp. Anyone have a link for me in the UK - either on ebay.co.uk (like this one 48Va:
http://www.ebay.co.uk/itm/2A-Seconda...item3a614d8910

or is one of these the right one?:

Your Search Results | Farnell United Kingdom | Results

Thank you in advance for any help, I realize I should have left it to a professional - it's just that I got the amp for 40GBP, and the repair would ammount to more...

Best regards to all,

JJ

Oh this is my first post so Hi everyone!

AndrewT · 10th February 2012, 03:38 PM

Your profile is blank.

jakaj · 10th February 2012, 03:48 PM

Thank you for bringing my attention to my profile being blank - I remedied that

10th February 2012, 02:27 PM	#6
jakaj diyAudio Member Join Date: Feb 2012 Location: Exeter, UK or Ljubljana, Slo	Which PSU should I buy I recently blew my Vox Pathfinder 15r transformer - I am using the tda2040 - and from what I am reading I should use a 12-0-12 40Va, to get +/- 17v - the problem is I have very little idea what that means, and I would like to buy the right (not to expensive) PSU for the amp. Anyone have a link for me in the UK - either on ebay.co.uk (like this one 48Va: http://www.ebay.co.uk/itm/2A-Seconda...item3a614d8910 or is one of these the right one?: Your Search Results \| Farnell United Kingdom \| Results Thank you in advance for any help, I realize I should have left it to a professional - it's just that I got the amp for 40GBP, and the repair would ammount to more... Best regards to all, JJ Oh this is my first post so Hi everyone!

10th February 2012, 03:38 PM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Your profile is blank. __________________ regards Andrew T.

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15th May 2006, 12:16 PM	#2
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	If the reason that you want to use this circuit is because you want +-15v from a higher voltage(like the rails of a amp) why not look at this: project #102 from ESP http://www.sound.westhost.com/project102.htm You can still regulate it afterwards

15th May 2006, 04:44 PM	#3
steinchen diyAudio Member Join Date: May 2005 Location: Frankfurt / Germany	more than 20V across the regulators will produce a huge amount of heat, I'd rather pick a transformer with 18V secondaries, 3V across the regs is sufficient how many amps does your TDA2040 amp draw ?

15th May 2006, 07:46 PM	#5
consort_ee_um diyAudio Member Join Date: May 2004 Location: Hertfordshire	The TDA2040 will be unstable because of the low gain needed. Why not use a 7812 and 7912?

10th February 2012, 03:48 PM	#8
jakaj diyAudio Member Join Date: Feb 2012 Location: Exeter, UK or Ljubljana, Slo	Thank you for bringing my attention to my profile being blank - I remedied that

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