[sdiy] D.C. Level Shifting question

[pfperry at melbpc.org.au]

Ethan Zer0 <ethanzer0 at yahoo.com> wrote:
> if they both do the same thing.  The first circuit
> would shift all A.C. voltage to D.C. voltage.  
...if you want the signal "smoothed out" after convertig to DC,
then it is called an "envelope follower".

>The
> second circuit would shift only the negative range of
> an A.C. voltage into the positive range.  
...this is called a "precision rectifier", every text on op amps
will have some discussion of this, if you mean that the positive 
range of the signal is left as it is.

>Are these
> tasks accomplished the same way,
...there are a number of different full wave rectifier circuits, but yes,
the rectifier part can be the same, the question is whether the output
is filtered or not.

paul perry (Frostwave) Melbourne Australia 
-- 
Message sent by Webmail from melbpc.org.au