[sdiy] Best way to get +5 from +-12

[Bobinvertedsdiy at aol.com]

In a message dated 2/27/2003 3:42:43 PM Eastern Standard Time, 
harrybissell at prodigy.net writes:


> Hi Bob:
> 
> You need a series resistor and a zener (of course)
> 
> Zener (or shunt) regulators are a good choice if
> you only need a small current. They become very
> wasteful of power at larger currents.  They are
> VERY stable and do not ever oscillate or overshoot
> like linear regulators can...
> 
> The 7805 (series) linear regulator is another good choice
> for higher currents.
> 
> If you contact me with the current you think you need
> (you HAVE to estimate this if you want a successful
> design) I can help you with the (simple) math to choose
> the correct components.
> 
> Rule of thumb (for me) I like Zener regulators below maybe
> 20mA tops... I prefer 10mA
> 
> H^) harry

That's exactly what I needed to know. Great! Thanks!

Robert 
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