From: jjk439@gmail.com   
      
   On Wednesday, October 23, 2013 8:39:08 PM UTC-4, Fred McKenzie wrote:   
   > In article ,   
   >   
   >  jjk wrote:   
   >   
   >   
   >   
   > > I also tried a 9v battery connected to a 100K pot, wiper connected to a 10k   
   >   
   > > resistor to the zener cathode, and the anode connected to the other end of   
   >   
   > > the pot and to the battery negative post.   
   >   
   > >   
   >   
   > > +9v   
   >   
   > >  |   
   >   
   > > 100K pot ---10K ----cathode   
   >   
   > >  |                    |   
   >   
   > >  gnd------------------|   
   >   
   > >   
   >   
   > > Works fine with all of my 5.x zeners.   
   >   
   > > The 3.3v zeners never get above 1.8v at the cathode when the pot wiper is a   
   >   
   > > at 9.2v.   
   >   
   > >   
   >   
   > > This feels like a bad dream where you run and not get anywhere.   
   >   
   > > I sure would like to get this behind me and continue with the larger   
   project   
   >   
   > > I'm working on.   
   >   
   >   
   >   
   > JJK-   
   >   
   >   
   >   
   > I did not see how you were using the 3.3 V Zeners.  If you are   
   >   
   > generating 3.3 Volt power, you might consider using the LM-317.  They   
   >   
   > are available in several packages including surface mount, and can be   
   >   
   > adjusted from 1.2 to 39 Volts using a pair of resistors.   
   >   
   >   
   >   
   > Fred   
      
   Thanks for your comments. The potentiometer circuit I described was for   
   testing an alternate power supply source to rule out a problem with my bench   
   supply.   
   I intend to use the zener for over voltage pin protection on 3.3v devices.   
      
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