Re: consiglio alimentatore 5V per DAC

Da ideafolle Dom 17 Nov 2013 - 18:55

...........ma' se lo dici tu e ne sei convino che cie stai sul cazzo !?

Da valvolas Dom 17 Nov 2013 - 19:32

In general, the best type of capacitors to use are
solid tantalum. Solid tantalum capacitors have low

impedance even at high frequencies. Depending
upon capacitor construction, it takes about 25
mF inaluminum electrolytic to equal 1
mF solid tantalum at
high frequencies. Ceramic capacitors are also

good at high frequencies, but some types have a

large decrease in capacitance at frequencies
around 0.5MHz. For this reason, 0.01
mF disc mayseem to work better than a 0.1
mF disc as a bypass.
Although the LM338 is stable with no output capacitors,

like any feedback circuit, certain values of

external capacitance can cause excessive ringing.

This occurs with values between 500pF and
5000pF. A 1
mF solid tantalum (or 25mF aluminium
electrolytic) on the output swamps this effect and

insures stability.