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

[David G. Dixon]

...and yes, this little regulator is sourcing all the gates and triggers as
well.


> What I've done is simply put a 78L05 (TO-92 package) on the board.  It
> will
> source up to 100mA.  If you are using reasonably low-power digital chips
> (CMOS, not TTL) then this should be OK.  My keyboard matrix scanner PCBs
> are
> nearly all digital, and one 78L05 powers the lot without getting the
> slightest bit warm.  I put one 10uF bypass cap on the 5V line for digital
> noise suppression.
> 
> This technique gives you the power where you need it, and saves you having
> to retrofit a +5V supply into your whole system.
> 
> 
> > 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?
> >
> > cheers,
> > Danjel
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy