Have a look at http://www.wd5gnr.com/basiccir.htm

Al Williams
AWC
* Floating point A/D
http://www.al-williams.com/awce/pak9.htm



> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Kieren Johnstone
> Sent: Tuesday, July 09, 2002 8:30 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE] Suitable power supply workings-out
>
>
> Hi,
>
> I gots meself a book from the library "Starting Electronics"!
>  And this Saturday, I'm going down to Brighton to visit a
> Maplin store and get some kit to get started.  But after
> reading the book I am left clueless about one thing with
> power supplies.  Say I wanted to power this
> http://www.maplin.co.uk/products/Module.asp?CartID=02070913574
> 91453061&modul
> eno=11711&modulecode= lovely laser (just 'cos it looks
> cool).. It takes a 3V power supply, the operating current is
> 40 to 70mA, and the output power is 3mW.  However, I don't
> know how to work out (for example) what
> battery(/batteries) to use (assuming it's on its own
> circuit).  Theres not much on power (watts etc.) in the book
> so I really don't know how to go about it.  I could use (off
> the top of my head) 2 AAA-size batteries in series to
> generate a 3V supply, but does that give 40 to 70 mA of
> current? Am I right in thinking the source decides the
> current, or does the load draw from it?  Just need a little
> clear-up in my head :)
>
> Thanks,
> Kieren
>
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