[sdiy] most efficient way to get 5V from 12V?

[johnspeth at yahoo.com]

> If I want to run the digital parts of my module at 5V I am going to
> need to convert the 12V source. On some Euro modules the 5V conversion
> is done externally via a Doepfer 5V adapter (just has a regulator and
> a heatsink on it and plugs into the bussboard)
> 
> Is there any reason that I can't do this on the module?  If I do it
> there, what is the most efficient way (i.e. generates the least heat)
> so that I don't need a large heat sink?

That is hard to answer without you specifying how much current:

a) your 12V can supply
b) you need to deliver from 5V

There are a number of secondary questions that need answers but these are the two biggies.

In this modern age of low-power circuits, usually a 7805 regulator will do the trick and you have a few packages to choose from for the load you anticipate.

JJS