From: peter2@hipson.net   
      
   On Thu, 20 Nov 2008 11:27:27 -0600, geronimo    
   wrote:   
      
   >    I ordered  eight TO-220 7805ABC regulators from Mouser   
   >electronics. The 0-20 V digital LED panel meter I got didn't have the   
   >needed regulator power supply, so I had to  build it. The DPM is for   
   >monitoring a 12 volt battery, and so the input sensing wire to the DPM   
   >also just connects to the same 12v battery voltage that the 5 volt   
   >supply circuit does.  Well, I built up a 5V supply on a tiny perf   
   >board, and when I powered up the DPM it would flash random normal   
   >voltages, from around 2 to 12 volts for a brief second and then show   
   >'the overrange indication. So I checked the output of the 7805   
   >regulator, and it's exactly 7 volts, not five. No wonder the DPM isn't   
   >working right. So I tried the other 7805 ICs and get the same exact 7   
   >volts output. How can this possibly be? Its a high end fluke DMM, I am   
   >confident the voltage is not off! I don't think there is even a 7807   
   >regulator, is there? They are indeed marked "7805ABC".   
      
   You do realize your DPM requires an isolated power source, right?   
      
   Show us a schematic of what you are doing, or have done.   
      
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