Deadeye, go to http://www.zapperlab.com/ZapSchematic.gif
There you will see the additional 39k ohm resistor. This schematic diagram is on page 515 of the revised HIV/AIDS book. The purpose of this new resistor is described on page 506 of the same book. If you made your Zapper from her "Cure All Disease" book, you should have no trouble adding this part to your Zapper. Everything else is the same.