Why use full wave rectifier with DC?

TWRackers

Joined Dec 29, 2008
41
It's also a handy technique if, for example, you have a signal that's going to drive an LED (or in my project, the input side of an optoisolator), and you don't know with certainty the polarity of the signal.
 

packrat

Joined Feb 25, 2009
12
Most likely(if you follow all the directions to the letter, specifically regarding the V rating on the input cap), though you wouldn't want the adapter to exceed 40V as thats the limit of the LM317.
 

thingmaker3

Joined May 16, 2005
5,083
I would also use a bigger capacitor. A heat-sink on the regulator would be a good idea when working with the lower voltages, especially if the AC input is much more than 9Vrms.
 
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