Recently I've had terrible luck buying those little DC-DC boards from China off of eBay.
We've been trying to build projects where we have some sort of wobbly input DC off of a car or solar, batteries and things.
So I've started trying to learn how to design and build my own DC-DC SMPS circuits.
I'm very new at this, so I'm looking for something that I can use as a calculator (input Vin and Vout, etc) but also I need to understand what's I'm doing and what's going on.
To start with I've decided to take one of our projects which needs an SMPS and build it, something which these little boards off of eBay would probably be unsuitable for.
Project: A portable, battery powered audio amplifier.
I'm going to buy a DIY amp board, deliberately choosing one which requires a high voltage to run (http://goo.gl/Idwos8 or http://goo.gl/11S6TJ perhaps) and are cheap so I won't get upset if I blow it up.
Then, take something cheap and wholly unsuitable to run it off, such as 4xAA batteries.
So, about ~6V in and I need ~30V out.
So there we go, where can I get a design which lets you calculate how to build a 6V to 30V SMPS?
Once I've done that I need to then build something useful.
I though I'd start with a 12V VRLA battery, step that up to 36V.
Problem then is how do I, you know, make it not melt when there is hundreds of watts happening?