On Wed, 11 May 2022, Paul Koning wrote: > > I guess especially for standard capacitors factories ordered whatever was > > readily available whereas with the high-ripple low-impedance/ESR parts the > > choice was much more limited. > > I wonder if nowadays a good replacement for the case where low ESR is > needed would be a big ceramic capacitor. Unlike the old days those now > can be had in many-µF capacitances.
Possibly, in the lower capacitance range, if not for the horrendous price, e.g. $50/£40 each for a 470µF/25V part: <https://www.mouser.com/ProductDetail/661-KTD250B477M99A0B> (at least you get free shipping for just one piece). There's still little choice for the higher range parts found in DEC PSUs, such as 1800µF/25V, 4700µF/10V or 6800µF/20V even. With aluminium organic polymer capacitors rated voltage also quickly drops for higher capacitances, so you won't get any of these as replacements either. I don't know offhand to what extent these limitations come from current technology vs the laws of physics. Maciej
