I'm about to build a pretty simple PSU for my modular synth project. I'm looking at a few schematics from popular sites and I've previously built a simple wall-wart one based on this from MusicFromOuterSpace.
There are also lots of kits with these 7812/7912 pairs like this.
But then I watched this video on capacitance multipliers and just don't understand why this isn't used everywhere? I guess I'm missing something.
What I mean is, it seems to be a really big thing to really reduce ripple on power for synth applications. The schematics I'm looking at are sticking really really big electrolytics in there to do that - it's like that's probably the big material cost for these PSU's. Like 10kuF or so. Wouldn't it be a very simple win to just use a mosfet capacitance multiplier just before the voltage regulator?