PSU using TDA2040 ?

[poynton]

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]

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]

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]

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]

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

 

[jakaj]

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-Second...al_Components_Supplies_ET&hash=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]

Your profile is blank.

 

[jakaj]

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