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Steve, I'm sure you know this, but others may not...stevez said:<snip>some of the 3 terminal regulators do suppress ripple.<snip>
To qualify my statement - if the ripple were at a high frequency, it might not be attenuated enough. I was relating to 120Hz and its harmonics.stevez said:Ron - thanks for giving me the credit though that wasn't on my mind when I replied. What I know for sure is that I don't know if the ripple reduction characteristics of many or all 3 terminal IC regulators are controlled or predictable. I am not saying that a non-predictable characteristic is of no value - just that if it isn't controlled, at least at some min or max value, then it's hard to include in design.
For DSA66 benefit - if we are talking about the big filter capacitor, note that a high degree of precision in calculations isn't a must. The bigger capacitors have quite the wide tolerance and if the calculation is important you might want to use the lowest value of capacitance expected. Now, if you have capacitors on hand that are much larger in value then within limits, use them. Less ripple is usually not a problem. At some point the current demand to charge a large capacitor can momentarily overload the circuit supplying it but that's also manageable.