I've designed a few simple audio circuits, but when it comes to power supplies, I'm a novice. I've been learning about power supplies used for guitar pedals (9v, 12v, 18v). Most commercial ones are two stage SMPS. First stage steps it down and creates a 24v bus, then they create individually isolated taps at various 9/12/18 voltages. So for instance, it's typical to have 5-8 taps, each providing 100-500mA @ 9v.

I'd like to build/design my own, realizing it will likely be bigger than anything I could buy. I understand that, compared with linear supplies, SMPS are tricky to filter correctly when used for audio applications like this. Where do I start? Are there existing designs I could learn from, modify, etc?

 

I've designed a few simple audio circuits, but when it comes to power supplies, I'm a novice. I've been learning about power supplies used for guitar pedals (9v, 12v, 18v). Most commercial ones are two stage SMPS. First stage steps it down and creates a 24v bus, then they create individually isolated taps at various 9/12/18 voltages. So for instance, it's typical to have 5-8 taps, each providing 100-500mA @ 9v.

I'd like to build/design my own, realizing it will likely be bigger than anything I could buy. I understand that, compared with linear supplies, SMPS are tricky to filter correctly when used for audio applications like this. Where do I start? Are there existing designs I could learn from, modify, etc?

These might help:
Audio Amplifier Power Supply Design
Guitar Pedal Schematics and Circuits