Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Curtis Richards <cwrxr@e...> 
wrote:
>  From some quick one off experiments using Ben's system on 1 ounce 
PCB I 
> would say that it is fast enough to an 8 by 11 inch board in under 
an 
> hour for a lot less money than the Garden of EDM.
> 

Curt,

I have Robert Langlois's book, but not Ben Fleming's. Can you tell me 
if there is any similarity between Ben's Relaxation Oscillator and 
that of Robert Langlois, or does Ben's have any active control?

Thanks

Roger