Dave, 500 reads already! You have hit a "nerve" (in a good way) with this one. I have followed you through from the very first videos, and follow what you are doing well enough (sign of a good teacher
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
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You are no doubt going to get DOZENS of "how about this/that?" options. Here are mine.
>> 10V limit? That's
fine, but for a number of projects I would like to look to at least the "industry standard" of 30V, even though I won't use it often. I will go though the circuit myself to see what limits higher voltage working (I can sacrifice some of the 2.5mV resolution!)
>> I would like to give some though to a twin channel supply, that the outputs can be paralleled/Serialed up. Hmm.. might need two complete identical PSUs, with some (digital opto) isolation between the two... That'll be "Power Supply Design part 17", then!
>> "I agree with Nick" (famous slogan in the UK General Election, last year; may not translate down under!) You can save three of your four switch pins PB1-PB4 using a simple switched resistor ladder. Make the resulting analogue voltages 2, 1, .5 and .25V. Then if some smart arse presses two buttons to produce an analogue output of 0.75V you will have the A>D resolution to detect and reject it. I have used this to good effect before - it is perfectly reliable with up to 5 switches.
>>With one of those freed up pins... how about a little bit of temperature feedback from the heat sink? (or is the LT3080 able to look after itself?)
Some really nice touches in your design, and very clearly explained - thanks again.