Hi V,
   
  The output of a 555 timer running on 9 volts is about 5 volts switching from 
+5 to zero.
   
  This is adequate for zapper work. The difference between a 555 zapper and the 
godzilla is very great. The godzilla is a continous voltage while the 555 timer 
pulse is a square wave that is composed of a multitide of frequencies.
   
  The zapper (555 timer) is more like a rife machine than it is like the 
godzilla.
   
  I would be very careful about going to a higher voltage. I have never seen 
any work recommending high voltages.
   
  When a root cannal reinfected in 2002 it almost destroyed my heart. The 
output dropped to 20% that is class 4 or pine box level. Antibiotics has killed 
the bacteria except for that which took up residence in my left knee. 
   
  Using Dr. Clark's protocol of 7min. on 20 min off repeated three times with 
the electrodes below each knee eliminates the knee pain. However it seems to 
return after 3 or 4 months. The next time it returns I will try the 6 vot DC 
process and see if it does anything.
   
  "Ole Bob"