From: wrompel@w-r-e.de   
      
   "Jasen Betts"  schrieb im Newsbeitrag   
   news:gh5j7d$8e3$2@reversiblemaps.ath.cx...   
   > On 2008-12-02, Brian Gregory [UK]  wrote:   
   >> "geoff"  wrote in message   
   >> news:BuCdnb3MquEiya7UnZ2dnUVZ_tTinZ2d@giganews.com...   
   >>> geronimo wrote:   
   >>>> Hello all, it was just a bad batch of 7805s!   
   >>> Possibly a 'fake' device.   
   >>   
   >> I've a vague idea that I remember a 7905 accidentally fitted instead of a   
   >> 7805 did something very similar in something I was working on.   
   >   
   > hmm, yeah, given a 12V supply and no load you'd get that.   
   >   
   >   
      
   Looks like operating the 7805 as pulse with modulator / switching regulator.   
   Some digital voltmeters show unreal values, when the DC inputs are driven by   
   pulses. Oscillation usually happens, when the input and output capacitors   
   are missed.   
   Place at least 1µF/16Volts electrolytic cap's  from input terminal to GND   
   Pin and also from output terminal to GND Pin. Place the capacitors as close   
   as possible to regulators case. Please report the voltage reading.   
   w-ro   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)