I'm projecting a stereo amplifier, but in the final stage of my project, I have questions on how I should hook up the grounds with the least humming.
My plan is to hookup the ground from the power supply first to the main filter capacitor, then to the input stage of the TDA2003 (the ground of the volume potentiometer and the ground of the feedback network), then to the amplifier ground and load ground, being those last two grounds decoupled from the former throught a thin wire.
Is this correct?
I tested this on a breadboard using only one amplifier and notice a very small hum.
The idea is to keep the input stage clear of ground pertubations. I'm using a buss configuration.
Here is the datasheet containig the circuit in which I'm based on: http://www.st.com/stonline/products/literature/ds/1449.pdf
My plan is to hookup the ground from the power supply first to the main filter capacitor, then to the input stage of the TDA2003 (the ground of the volume potentiometer and the ground of the feedback network), then to the amplifier ground and load ground, being those last two grounds decoupled from the former throught a thin wire.
Is this correct?
I tested this on a breadboard using only one amplifier and notice a very small hum.
The idea is to keep the input stage clear of ground pertubations. I'm using a buss configuration.
Here is the datasheet containig the circuit in which I'm based on: http://www.st.com/stonline/products/literature/ds/1449.pdf