Hi all
I could do with a little bit of advice please. Now I know the TDA2003 chip is not the best thing in the world to be using but it is what I have and up to a point its working fine in a bridged format. @12V I believe I am getting around 11W into a 4ohm speaker. to test the unit out I am using a 12V battery an mp3 player and a 4ohm speaker. The problem is, without input there is a lot of 'white noise', or hiss, present so the input of audio has to be cranked a bit to be heard 'just' above the noise but is present and can still be heard whatever increase I apply to the input. Ideally I will be putting line level input if I can clean up the noise a bit. Is there a way of depreciating the hiss? is it sound to noise ratio related even though it is present without input. Here is the schematic I used and the PCB I drew up from the awful online PDF image of the PCB. All capacitors are polyester except C5 which is a large green mylar I think. R1 is made up of 2 values as I didn't have the exact value and the electrolytic is the correct value. I know with the simplicity of the circuit there are bound to be sacrifices but if it's possible to tweak it to 'good enough' I will be happy.
regards
Fenris
I could do with a little bit of advice please. Now I know the TDA2003 chip is not the best thing in the world to be using but it is what I have and up to a point its working fine in a bridged format. @12V I believe I am getting around 11W into a 4ohm speaker. to test the unit out I am using a 12V battery an mp3 player and a 4ohm speaker. The problem is, without input there is a lot of 'white noise', or hiss, present so the input of audio has to be cranked a bit to be heard 'just' above the noise but is present and can still be heard whatever increase I apply to the input. Ideally I will be putting line level input if I can clean up the noise a bit. Is there a way of depreciating the hiss? is it sound to noise ratio related even though it is present without input. Here is the schematic I used and the PCB I drew up from the awful online PDF image of the PCB. All capacitors are polyester except C5 which is a large green mylar I think. R1 is made up of 2 values as I didn't have the exact value and the electrolytic is the correct value. I know with the simplicity of the circuit there are bound to be sacrifices but if it's possible to tweak it to 'good enough' I will be happy.
regards
Fenris
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