[sdiy] power question

[Ted Slominski]

Thanks everyone for your help,

it's a midi analyzer with the SW +5v powering an LCD, some pullups and 
an opto-isolator.
the schematic is here: http://www.maxmidi.com/diy/viewport/view8x10.gif

I'm not sure what in this circuit is generating the switched voltage.  
I was also going to run it off of the +15v coming out of a blacet 
supply through a simple voltage regulator using a 7805 instead of the 
battery they've got... how would this effect SW?  would it then be 
needed?  My understanding of a switched supply is that it's regulated, 
thus good when something's running off of a battery.

thanks
-ted

On Friday, April 11, 2003, at 10:51  PM, Paul Perry wrote:

> At 09:30 PM 11/04/03 -0700, Ted Slominski wrote:
>> i'm looking at a schematic that has both +5v and SW +5v.  I assume 
>> that
>> SW means standing wave, but how  would i generate that?
>
> ....it doesn't mean 'standing wave', believe me.
> What kind of circuit is it?
> Some mixed analog/digital circuits have separate supplies,
> to stop noise on the digital line getting into the analog.
>
> paul perry melbourne australia
>
> (could also mean switched +5, for some reason).
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