>http://www.royalrife.com/ which is Dr. Richard E. Lloyd's website you will
> find a much improved version of the >original pulser idea designed by 
>Dr. Beck. Just scroll down until you come to the Super thumpy listing in 
>the index-----this is a splendid little unit and quite simple to construct, as 
>the only real modification is the substitution of the large firing capacitor. 
>the instructions are first-rate and the cost of the Radio Shack strobe unit 
>is around $35.00. It is quite a rugged little unit. 

This unit (Cat.# 42-3048) is on sale for $17.49 at:

http://www.radioshack.com

Regards,
George Martin