[sdiy] LM317 vs 780x "report"

[Kevin Lightner]

>I needed a power supply for a ladder filter box and decided to do a quick
>shootout with some voltage regulators.
>
>7812 (my so far "all time" regulator)
>lm317
>z-diode with darlington emitter follower (discrete approach)
>
>the 317 regulator had WAY less noise then 7812 in my application (single
>way rectifier/wall wart) and a very good ripple rejection.
>z-diode regulator had about the same noise but bad ripple rejection and
>load regulation (as expected..)
>
>i will switch to the 317/337 series. one additional benfit is that i olny
>need to stock one part for several output voltages.
>
>bye
>christian

The 317 is a better regulator overall and is adjustable (buy lots of 
240 ohm resistors! ;-)

You can buy preset voltage 317s too.
An LM317-12 would be the same pinout and package as a 7812, but with 
the properties of a 317.


-- 
Regards,
Kevin Lightner

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