12v power supply for tda8560

[lew666]

Hi all, ive built a simple amplifier with the tda8560 following the schematic on the datasheet.
http://pdf.datasheetcatalog.com/datasheet/philips/TDA8560Q.pdf

Im a huge novice and am having some trouble knowing what power supply i need. Ive been using several 12v power supplies and am getting noise (loud humming through the speakers) with all of them. If i hook it up to the car battery it works perfectly so im assuming theres some AC noise interference?

Any help would be appreciated. Thank you

 

[Minion]

Im sure you probably just need a well filtered PSU , What type of psu have you tried ?? could you mod one with extra capacitance and maybe a snubber ??

 

[hatallica]

Your datasheet link has an extra character at the end of it. No matter, as the issue seems to simply be the supply. So, as Minion pointed out, it will be helpful to have more information (and picture?) of the power supply.

I have experienced similar issues with +12VDC supplies to chip amp circuits, but was lucky that I had other supplies that did not create the noise.

 

[lew666]

Thanks for the replies, appreciate your time.

Ive simply been using things ive found around the house and work etc. first tried a laptop power supply,

then a couple of transformer square plug type things like this:
12V DC Power Supply - Part 1

I assumed then that i needed something that was regulated so i brought this off ebay:
DC 12V 1A CCTV SECURITY CAMERA REGULATED POWER SUPPLY ADAPTER WITH LED 1000mA | eBay

You can probably tell by now i dont know what i need, im a mechanical engineer and electrics are abit of a dark art to me.

Thanks

 

[Minion]

It looks like those Power supplies are the walmart type , the basic black box that you plug into the wall ..... Those types of Power Supplies generally don"t have enough filtering to provide a good stable DC source , especially with higher current applications like an audio amp .....

What you could try is adding a larger value cap in parallel with the PSU but you will do better to get a good well filtered PSU that can deliver about 3 amps of current .....

You could also build one with a 50Va-100Va 12v AC power transformer and a bridge rectifier and a 10,000uF cap .....

 

[lew666]

Is this the kind of thing i need? I can build one of these. It states a max of 1amp, looking at the datasheet is this enough?

http://m.instructables.com/files/deriv/F6Z/DVT6/FKVQJ2RJ/F6ZDVT6FKVQJ2RJ.MEDIUM.jpg

Thanks

 

[Minion]

Well , you will definitely need more than 1 amp of current and a car amp doesn't nescessarilly need a regulated supply , even from a car when the engine is running puts out like 14.4v and the chip will handle 18vdc so I still recommend getting a power transformer (maybe from an old amp or a lighting store) and a bridge rectifier and a big cap , could even wire in P2P without problems ....