When i learnt to design power supplies, the usual setup was:
- Transformator
- Bridge rectifier, using 4 rectifier diodes (1N4007)
- A few caps of different values in parallel 100n, 10u, 1000u
- followed by a linear regulator, if voltage had to be of exact value

Recently, I read that conventional power supplies, like the one
described above, are today designed using shottky diodes, instead of
rectifier diodes, because of the reduced switching capacitance within
such a diode, reducing niose on the DC output.

so good so far. this may really be an advantage. but what I do not
understand is, why they place separate capacitors over each of these
shottky diodes. doesn't this result in the same effect, I get using
'normal' recitifier diodes with higher internal capacitance?

please help!

tino

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