Lets take a ss psu pcb, a ground plane arrangement for the smoothing caps then at the output a star ground for signal and power return. Should the chassis ground (back to back diode+ cap+ 10ohm) be terminated at the star ground or at the very end of the psu ground plane near the rectifiers?
I read a post here that it should be the latter because the chassis ground is very dirty and its basically there to flush out any standing current, but i cant find that post.
I read a post here that it should be the latter because the chassis ground is very dirty and its basically there to flush out any standing current, but i cant find that post.
I have always brought the mains earth in and terminated as near to the input socket as possible on the chassis .
The shorter the distance the better for the star earth to return the currents out of the amplifier the better .
I always use JLH,s method of a 10 ohm resistor between the input signal earth and the output devices earth return as heavy noise currents are separated from the sensitive input .
The power supply returns should be connected directly to the mains input termination on the chassis.
But look all this depends on circuit design , if its a very low input sensitivity then the signal to noise ratio will be very different to a high sensitivity input and I always built high sensitivity inputs so I had more to cope with.
The shorter the distance the better for the star earth to return the currents out of the amplifier the better .
I always use JLH,s method of a 10 ohm resistor between the input signal earth and the output devices earth return as heavy noise currents are separated from the sensitive input .
The power supply returns should be connected directly to the mains input termination on the chassis.
But look all this depends on circuit design , if its a very low input sensitivity then the signal to noise ratio will be very different to a high sensitivity input and I always built high sensitivity inputs so I had more to cope with.