TDA2004 Amplifier

Pehr · Posted: Sat Apr 08, 2006 4:18 am Post subject: TDA2004 Amplifier

I have a spare TDA2004 and a 12", 4 Ohm speaker that I want to use with my synths. I've searched for a good schematic with TDA2004 but I haven't found much.

Does anyone know know any good schematic for such an amplifier? Confused

Macaba · Joined: Jul 13, 2005 Posts: 160 Location: UK

http://www.es.lth.se/ugradcourses/elektronik/pdf/2004.pdf

Page 3 of the datasheet has an 'test and application' circuit. This features capacitors to do fancy things (well, the input capacitor is very important), i think theres a zobel network in there too. You could just hook it up like a normal op-amp with gain resistors, with the addiction of that capacitor on the input to remove DC offset.

Pehr · Posted: Sat Apr 08, 2006 8:25 am Post subject:

but thats a test circuit... Confused

I just found this schematic. But I don't fully understand the circuit. Where's the ground? Confused

elektro80 · Posted: Sat Apr 08, 2006 8:36 am Post subject:

Pehr · Posted: Sat Apr 08, 2006 8:44 am Post subject:

Oh, right now I see hehe Embarassed

I'm thinking of building the one to the left since it is for a 4 Ohm speaker, but I don't understand that both the connections on the speaker is connected to the outputs of the two amplifiers... I'm used to the way the right schematic luses the speakers, one connection to the output and one to ground... but I just have to breadboard and see what happens Very Happy

blue hell · Posted: Sat Apr 08, 2006 8:48 am Post subject:

The left one is a bridged circuit, you'll get more power from the same supply voltage that way (four tines as much) - but the power supply needs to be able to deliver twice the current.

When one amp drives positive the other drives negative, that's the trick.

Macaba · Joined: Jul 13, 2005 Posts: 160 Location: UK

Pehr · Posted: Sat Apr 08, 2006 9:51 am Post subject:

blue hell · Posted: Sat Apr 08, 2006 10:45 am Post subject:

oops, you are right, better put on my glasses next time, this is a bit of a weird thing, it has no feedback at all Question

I looked around a bit, there is a bridged application for the TDA2005 at http://www.alldatasheet.co.kr/datasheet-pdf/pdf_kor/25038/STMICROELECTRONICS/TDA2005M.html and this suggests the dot we don't see should be there Question

Pehr · Posted: Sat Apr 08, 2006 11:47 am Post subject:

So connecting the lines where we think there should be a dot will make it have feedback? Confused

blue hell · Posted: Sat Apr 08, 2006 1:04 pm Post subject:

Ok, I need to put in some more Question

's I guess Very Happy

I'm really not sure ... but it seems like ....

Pehr · Posted: Sat Apr 08, 2006 1:25 pm Post subject:

hehe, I think I'll just breadboard the circuit and see what happens Very Happy

thanks for the help! Cool

blue hell · Posted: Sat Apr 08, 2006 1:40 pm Post subject:

Good luck !

mosc · Posted: Sat Apr 08, 2006 2:16 pm Post subject:

Remember, these audio ICs are not OP Amps. They are special power amps. Don't expect them to be used like OP Amps.