Hi im putting together a preamp pcb as a lerning exercise and have a couple of questions.
One is how to make the earth connection if the preamp is a mono mono design in a single chassis (seperate psu for left and right). Its my understanding that whatever connections to the chassis you do, it should be made on a single point, but the layout looks more efficient if i pick 2 locations from the chassis, then to resistor/cap/back to back zener then to the psu grounds.
Also, does the signal input ground have to connect to the gnd of the pot before going to the psu ground? Because of my layout its more efficient to join the pot gnd and signal gnd seperately in a star ground arrangement
Thank you in advance for your help
One is how to make the earth connection if the preamp is a mono mono design in a single chassis (seperate psu for left and right). Its my understanding that whatever connections to the chassis you do, it should be made on a single point, but the layout looks more efficient if i pick 2 locations from the chassis, then to resistor/cap/back to back zener then to the psu grounds.
Also, does the signal input ground have to connect to the gnd of the pot before going to the psu ground? Because of my layout its more efficient to join the pot gnd and signal gnd seperately in a star ground arrangement
Thank you in advance for your help
Two major rules to follow:
- avoid loops of any kind, a chassis can act as a part of a loop
- avoid large (*) ac and/or dc currents running through signal ground paths
Adjust the layout to these rules, not the rules to your (more convenient) layout.
(*):
What is large? Larger then the current from another branch.
A distributed starpoint is possible though.
- avoid loops of any kind, a chassis can act as a part of a loop
- avoid large (*) ac and/or dc currents running through signal ground paths
Adjust the layout to these rules, not the rules to your (more convenient) layout.
(*):
What is large? Larger then the current from another branch.
A distributed starpoint is possible though.