[sdiy] Switching power supply transformers

[Karl Ekdahl]

 --- Batz Goodfortune <batzman-nr at all-electric.com>
skrev: 
> Y-ellow Karl Harry et all.
> 
> <SNIP>
> 
> You should be alright in terms of the 5 volt supply
> for the logic, Though 
> it would be prudent to observe the rules for mixed
> signal PSU routing 
> overall. That is. Separate termination for analogue
> and digital grounds.

This is one of the issues i was thinking of. I'm doing
a analog drummachine with a digital sequencer and the
only signal i need to connect from the digital part to
the analog is the triggers (8 of them). How do i
realize this without mixing the grounds? Optocouplers?
Or is there any even simpler method?

What i found is a wallwart transformer on a flee
market. I bent it open and it's shielded and
everything so i'll probably just glue it back together
and use it as it is. If 20% of usage is the
requirement, then out of 2A i have to use 200mA,
right? My application is allready consuming well over
500ma so that should be O.K. i guess..

thanks

Karl