NOISELESS, Studio-Grade DIY Stomp Power Supply?

[Bongolation]

I'm up to my ears in scrap components and hardware, and I'm tired of paying a king's ransom to Eveready to keep the dozens of stomps going in my studio. I've held back on buying a power supply as most are overpriced and noisy and I have better components to hand here for building one anyway. All I need is a $1 VR and I'm in.

There are a lot of DIY designs out there, but does anyone know of one that stresses clean, absolutely noise-free output?

As always, thanks for any useful data & links!

[niftydog]

I basically implement every recommendation in an LM317 regulator datasheet and I've had excellent results. These things already have great common mode rejection, which you can beef up by adding the 'optional' capacitor to ground from the adjustment terminal. Then use filter caps as big as floor toms and you're away!

[SpankyPants]

So the timpani-sized capacitors won't work as well?

Damn.

[Bongolation]

Originally Posted by niftydog

I basically implement every recommendation in an LM317 regulator datasheet and I've had excellent results. These things already have great common mode rejection, which you can beef up by adding the 'optional' capacitor to ground from the adjustment terminal.

I was going to use a different VR, but a 317 would be easiest to get locally, plus I'd like to rig a trimpot adjustment.

Then use filter caps as big as floor toms and you're away!

Size is mainly a function of V ratings with these, so is there an advantage to using caps with voltage ratings excessively higher than the working circuit's?

Unless anyone had anything sexier, I was going to use this, with a different layout and some of my own modifications.

Anything you'd change?

[niftydog]

Originally Posted by Bongolation

Size is mainly a function of V ratings with these, so is there an advantage to using caps with voltage ratings excessively higher than the working circuit's?

Anything you'd change?

No, I'd still go for a voltage rating around two steps above the working voltage - so don't go for 10V, but 16V would be good. I was more talking about putting 2200uF (at least) in there instead of the 470uF you usually see.

That's exactly what I use, except I tend to bump up the filter cap from 1000 to 2200 or 3300.