Hi again
I search voltage regulators with less noise. When I test 78xx regulators with lm317. I see that lm317 are near 4-5 times noiseless.
I try to find anothner good and cheep regulators but I can't find anything.
Actually I search up to 1 A current and 3 terminal regulators (better is with 2 resistor configuation).
I like to make quality power supply
I can filter with some capacitors (1000-2200uF) and like 9v output voltage with max current 1A, and with less elements, and better than lm317
You shoul calculate the correct caoacitor by this formula
C = I * Λt/ΛV Λt = 1/(2*f) if the rectifier is complete wave or Λt = 1/f for half wave
Λv is te ripple tension that you calculate in the entrance and is calculated based the Fr0 of the regulator and the maximum ripple in the output of the regulator
This information is mentioned up in my replie