[R-390] OT: Filter for 9VDC PS

[2002tii]

Barry wrote:

>I'm thinking of making a 9VDC, 1A supply
>Will 35mH be worth the effort or will I be just as well off without it?

Too small to do any good by a factor of around 100.  There's a reason 
chokes have never been used much in low-voltage power supplies.

I once built a pair of 25 watt, solid-state audio amps that used 
choke-input filters.  The four chokes weighed nearly 150 pounds.  The 
two power transformers were about 30 pounds each.  The amps would put 
over 300 watts into a 0.5 ohm load without complaining.

Best regards,

Don