I want to build my own power supply and have, of cause, already consumed Dave's videos, several times, but I am still uncertain on how to get started and how to reach as low a ripple as possible. I have found a ripple filter circuit that goes down to 20nV but only if you allready have below 300nV, I was not aware that it was even possible to go that low in ripple.
First some simple calculation that shows how I have arrived at my target power:
I was first thinking of building a power supply, capable of driving a 50W 8 Ohm = 20V (400W 2 Ohm) power amplifier but then thought that it is fairly limited and maybe not enough for a later project, so I ended up thinking that 200W 8 Ohm power amplifier will be max I ever will need: 200W 8 Ohm = 40V (1600W 2 Ohm).
1600W / 40V = 20A but that do not leave any headroom at all, so why not 50V 25Amp = 1250VA and call it a day? :-)
Now is the question if linear or SMPS is the way to go, some keep saying that SMPS is a wary hard road, wary noisy and something most wont touch! While Dave says that they are almost the same, a few extra components, but nothing scary.
On the other hand, do I think that 95% effective transformers is out there and if we are only talking about 98% effective SMPS vs 95% effective linear, then, let's go linear. :-)
My problem is the filtering, Dave did make a fantastic video about the Cap-multiplier, but I don't think that it can handle 50V at 25Amp, so where do I please start?