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Designing a linear regulator with good "line regulation"
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dzseki:
Because a 6800uF capacitor is about 3-4 times bigger (and more expensive) than a 2200uF one, cascading two 78xx regulators would give 120dB PSRR for less than 2USD, but I had little PCB area left for even that. And as said above the LM317 does the trick as well basically at no extra cost and circuit space.
namster:
cascading two 78XX isn't a good idea , with a Minimum Droupout Voltage of 3V the two regulator will dissipate 3Watt , and i'm happy that you solved the problem .
dzseki:

--- Quote from: namster on August 28, 2019, 06:49:48 pm ---cascading two 78XX isn't a good idea , with a Minimum Droupout Voltage of 3V the two regulator will dissipate 3Watt , and i'm happy that you solved the problem .

--- End quote ---

Right now the unregulatted voltage before the regulator is 22V so that "excess voltage times current" has to be dissipated anyway.
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