PSU design?

[Tony Allgood]

Karl wrote: It worked fine
so i made a nice pcb to group the positive and negative supply. I used
large
trace for ground, unreg and reg voltage.
What a disapointment ! on the pcb version i get an horrible ripple,
several
hundred mV ! there is ripple everywhere...

Tony writes:

Don't use large ground conductors in any psu. Use carefully thought out
traces to give a star point grounding system. The amount of Guitar amps
that use wodges of copper for the ground supply, and they hum like
terrible. They think a guitarist won't complain (probably right), but
its crap design. Good analogue design doesn't stop after the circuit
digram has been drawn.

However, we all learn by our mistakes. You should have seen my first psu
for my poly. Oh, I laugh now... but it hummed. Talking of which, A
Danish engineer once told me the reason why transformers hum is because
they don't know the words to the tune. Ha, ha, ha, quick fetch the
doctor, my sides are splitting.

Bye for now,

Tony Allgood, Cumbria, UK