Benedikt wrote on 2024-12-18, 19:32:
Aside from the obvious voltage rating discrepancy - 25V vs. the original 16V - that part looks perfectly adequate.
It is probably even better than the original specifically because of the higher voltage rating, but might therefore also be a little bit bigger.
I think the same. Back in the 70s and 80s it was good practice to oversize the capacitor, rating wise (voltage).
The idea was that a bigger capacitor would be less stressen than a small one.
A small one would (6v, 16v) always be running at near maximum specs by contrast (5v, 12v operation voltage).
Using an overkill capacitor would have cost more money and take up more size maybe, but it didn't require any meaningful maintenance on long run.
A big capacitor could be installed and forgotten, working for ages.
Heat development would be much lower, also because of the big size.
But that was in a time when we still had linear voltage regulators and conventional power supplies.
Thing's like ESR didn't matter yet. A big ESR was a non-issue in practice.
Back then, various smoothing caps had been generously installed, as well.
There were three values that had been used often, I think: 100 nF, 1 µF, 10 µF.
Maybe 10 nF, too, but often it was a bit too little to have any noticeable effect.
Combining them as individual caps was okay, too, in order to block ripple and various RF signals from wandering across the circuit.
Edit: I forgot to mention. The values used in practice weren't chosen because of physics, but price.
There had been certain standard types of capacitors that were produced due to high demand.
That's why motherboards and expansion cards had used them.
The values chosen were more of an approximation of the ideal value than the ideal value itself.
That's why homebrew circuits or prototype boards had used different values sometimes, money didn't matter so much and correct values could be used.
That's why I'm so critical about mass production, also.
In my perceived reality, as a ham radio fan, most if not all commercial products have a lot left to be desired and must be "fixed" from very start.
For example, useful diodes, fuses and capacitors are often not populated on electronic PCBs.
They're left out, the markings of the missing parts can still be seen in the PCBs.
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In what to one race is no time at all, another race can rise and fall..." - The Minstrel
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